database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-04-22 23:02:54 +03:00
Code
postgres/src/backend/parser/parse_utilcmd.c
Peter Eisentraut ebf76f2753 Add TupleDescGetDefault() 
This unifies some repetitive code.

Note: I didn't push the "not found" error message into the new
function, even though all existing callers would be able to make use
of it.  Using the existing error handling as-is would probably require
exposing the Relation type via tupdesc.h, which doesn't seem
desirable.  (Or even if we changed it to just report the OID, it would
inject the concept of a relation containing the tuple descriptor into
tupdesc.h, which might be a layering violation.  Perhaps some further
improvements could be considered here separately.)

Discussion: https://www.postgresql.org/message-id/flat/52a125e4-ff9a-95f5-9f61-b87cf447e4da%40eisentraut.org
2023-09-27 18:52:40 +01:00

4489 lines
134 KiB
C
Raw Blame History

/*-------------------------------------------------------------------------
*
* parse_utilcmd.c
* Perform parse analysis work for various utility commands
*
* Formerly we did this work during parse_analyze_*() in analyze.c. However
* that is fairly unsafe in the presence of querytree caching, since any
* database state that we depend on in making the transformations might be
* obsolete by the time the utility command is executed; and utility commands
* have no infrastructure for holding locks or rechecking plan validity.
* Hence these functions are now called at the start of execution of their
* respective utility commands.
*
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/backend/parser/parse_utilcmd.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/amapi.h"
#include "access/htup_details.h"
#include "access/relation.h"
#include "access/reloptions.h"
#include "access/table.h"
#include "access/toast_compression.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/namespace.h"
#include "catalog/pg_am.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_statistic_ext.h"
#include "catalog/pg_type.h"
#include "commands/comment.h"
#include "commands/defrem.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
#include "parser/analyze.h"
#include "parser/parse_clause.h"
#include "parser/parse_coerce.h"
#include "parser/parse_collate.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/parse_target.h"
#include "parser/parse_type.h"
#include "parser/parse_utilcmd.h"
#include "parser/parser.h"
#include "rewrite/rewriteManip.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/partcache.h"
#include "utils/rel.h"
#include "utils/ruleutils.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
/* State shared by transformCreateStmt and its subroutines */
typedef struct
{
ParseState *pstate; /* overall parser state */
const char *stmtType; /* "CREATE [FOREIGN] TABLE" or "ALTER TABLE" */
RangeVar *relation; /* relation to create */
Relation rel; /* opened/locked rel, if ALTER */
List *inhRelations; /* relations to inherit from */
bool isforeign; /* true if CREATE/ALTER FOREIGN TABLE */
bool isalter; /* true if altering existing table */
List *columns; /* ColumnDef items */
List *ckconstraints; /* CHECK constraints */
List *nnconstraints; /* NOT NULL constraints */
List *fkconstraints; /* FOREIGN KEY constraints */
List *ixconstraints; /* index-creating constraints */
List *likeclauses; /* LIKE clauses that need post-processing */
List *extstats; /* cloned extended statistics */
List *blist; /* "before list" of things to do before
* creating the table */
List *alist; /* "after list" of things to do after creating
* the table */
IndexStmt *pkey; /* PRIMARY KEY index, if any */
bool ispartitioned; /* true if table is partitioned */
PartitionBoundSpec *partbound; /* transformed FOR VALUES */
bool ofType; /* true if statement contains OF typename */
} CreateStmtContext;
/* State shared by transformCreateSchemaStmtElements and its subroutines */
typedef struct
{
const char *schemaname; /* name of schema */
List *sequences; /* CREATE SEQUENCE items */
List *tables; /* CREATE TABLE items */
List *views; /* CREATE VIEW items */
List *indexes; /* CREATE INDEX items */
List *triggers; /* CREATE TRIGGER items */
List *grants; /* GRANT items */
} CreateSchemaStmtContext;
static void transformColumnDefinition(CreateStmtContext *cxt,
ColumnDef *column);
static void transformTableConstraint(CreateStmtContext *cxt,
Constraint *constraint);
static void transformTableLikeClause(CreateStmtContext *cxt,
TableLikeClause *table_like_clause);
static void transformOfType(CreateStmtContext *cxt,
TypeName *ofTypename);
static CreateStatsStmt *generateClonedExtStatsStmt(RangeVar *heapRel,
Oid heapRelid, Oid source_statsid);
static List *get_collation(Oid collation, Oid actual_datatype);
static List *get_opclass(Oid opclass, Oid actual_datatype);
static void transformIndexConstraints(CreateStmtContext *cxt);
static IndexStmt *transformIndexConstraint(Constraint *constraint,
CreateStmtContext *cxt);
static void transformExtendedStatistics(CreateStmtContext *cxt);
static void transformFKConstraints(CreateStmtContext *cxt,
bool skipValidation,
bool isAddConstraint);
static void transformCheckConstraints(CreateStmtContext *cxt,
bool skipValidation);
static void transformConstraintAttrs(CreateStmtContext *cxt,
List *constraintList);
static void transformColumnType(CreateStmtContext *cxt, ColumnDef *column);
static void setSchemaName(const char *context_schema, char **stmt_schema_name);
static void transformPartitionCmd(CreateStmtContext *cxt, PartitionCmd *cmd);
static List *transformPartitionRangeBounds(ParseState *pstate, List *blist,
Relation parent);
static void validateInfiniteBounds(ParseState *pstate, List *blist);
static Const *transformPartitionBoundValue(ParseState *pstate, Node *val,
const char *colName, Oid colType, int32 colTypmod,
Oid partCollation);
/*
* transformCreateStmt -
* parse analysis for CREATE TABLE
*
* Returns a List of utility commands to be done in sequence. One of these
* will be the transformed CreateStmt, but there may be additional actions
* to be done before and after the actual DefineRelation() call.
* In addition to normal utility commands such as AlterTableStmt and
* IndexStmt, the result list may contain TableLikeClause(s), representing
* the need to perform additional parse analysis after DefineRelation().
*
* SQL allows constraints to be scattered all over, so thumb through
* the columns and collect all constraints into one place.
* If there are any implied indices (e.g. UNIQUE or PRIMARY KEY)
* then expand those into multiple IndexStmt blocks.
* - thomas 1997-12-02
*/
List *
transformCreateStmt(CreateStmt *stmt, const char *queryString)
{
ParseState *pstate;
CreateStmtContext cxt;
List *result;
List *save_alist;
ListCell *elements;
Oid namespaceid;
Oid existing_relid;
ParseCallbackState pcbstate;
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
/*
* Look up the creation namespace. This also checks permissions on the
* target namespace, locks it against concurrent drops, checks for a
* preexisting relation in that namespace with the same name, and updates
* stmt->relation->relpersistence if the selected namespace is temporary.
*/
setup_parser_errposition_callback(&pcbstate, pstate,
stmt->relation->location);
namespaceid =
RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock,
&existing_relid);
cancel_parser_errposition_callback(&pcbstate);
/*
* If the relation already exists and the user specified "IF NOT EXISTS",
* bail out with a NOTICE.
*/
if (stmt->if_not_exists && OidIsValid(existing_relid))
{
/*
* If we are in an extension script, insist that the pre-existing
* object be a member of the extension, to avoid security risks.
*/
ObjectAddress address;
ObjectAddressSet(address, RelationRelationId, existing_relid);
checkMembershipInCurrentExtension(&address);
/* OK to skip */
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists, skipping",
stmt->relation->relname)));
return NIL;
}
/*
* If the target relation name isn't schema-qualified, make it so. This
* prevents some corner cases in which added-on rewritten commands might
* think they should apply to other relations that have the same name and
* are earlier in the search path. But a local temp table is effectively
* specified to be in pg_temp, so no need for anything extra in that case.
*/
if (stmt->relation->schemaname == NULL
&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
stmt->relation->schemaname = get_namespace_name(namespaceid);
/* Set up CreateStmtContext */
cxt.pstate = pstate;
if (IsA(stmt, CreateForeignTableStmt))
{
cxt.stmtType = "CREATE FOREIGN TABLE";
cxt.isforeign = true;
}
else
{
cxt.stmtType = "CREATE TABLE";
cxt.isforeign = false;
}
cxt.relation = stmt->relation;
cxt.rel = NULL;
cxt.inhRelations = stmt->inhRelations;
cxt.isalter = false;
cxt.columns = NIL;
cxt.ckconstraints = NIL;
cxt.nnconstraints = NIL;
cxt.fkconstraints = NIL;
cxt.ixconstraints = NIL;
cxt.likeclauses = NIL;
cxt.extstats = NIL;
cxt.blist = NIL;
cxt.alist = NIL;
cxt.pkey = NULL;
cxt.ispartitioned = stmt->partspec != NULL;
cxt.partbound = stmt->partbound;
cxt.ofType = (stmt->ofTypename != NULL);
Assert(!stmt->ofTypename || !stmt->inhRelations); /* grammar enforces */
if (stmt->ofTypename)
transformOfType(&cxt, stmt->ofTypename);
if (stmt->partspec)
{
if (stmt->inhRelations && !stmt->partbound)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("cannot create partitioned table as inheritance child")));
}
/*
* Run through each primary element in the table creation clause. Separate
* column defs from constraints, and do preliminary analysis.
*/
foreach(elements, stmt->tableElts)
{
Node *element = lfirst(elements);
switch (nodeTag(element))
{
case T_ColumnDef:
transformColumnDefinition(&cxt, (ColumnDef *) element);
break;
case T_Constraint:
transformTableConstraint(&cxt, (Constraint *) element);
break;
case T_TableLikeClause:
transformTableLikeClause(&cxt, (TableLikeClause *) element);
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(element));
break;
}
}
/*
* Transfer anything we already have in cxt.alist into save_alist, to keep
* it separate from the output of transformIndexConstraints. (This may
* not be necessary anymore, but we'll keep doing it to preserve the
* historical order of execution of the alist commands.)
*/
save_alist = cxt.alist;
cxt.alist = NIL;
Assert(stmt->constraints == NIL);
/*
* Postprocess constraints that give rise to index definitions.
*/
transformIndexConstraints(&cxt);
/*
* Re-consideration of LIKE clauses should happen after creation of
* indexes, but before creation of foreign keys. This order is critical
* because a LIKE clause may attempt to create a primary key. If there's
* also a pkey in the main CREATE TABLE list, creation of that will not
* check for a duplicate at runtime (since index_check_primary_key()
* expects that we rejected dups here). Creation of the LIKE-generated
* pkey behaves like ALTER TABLE ADD, so it will check, but obviously that
* only works if it happens second. On the other hand, we want to make
* pkeys before foreign key constraints, in case the user tries to make a
* self-referential FK.
*/
cxt.alist = list_concat(cxt.alist, cxt.likeclauses);
/*
* Postprocess foreign-key constraints.
*/
transformFKConstraints(&cxt, true, false);
/*
* Postprocess check constraints.
*
* For regular tables all constraints can be marked valid immediately,
* because the table is new therefore empty. Not so for foreign tables.
*/
transformCheckConstraints(&cxt, !cxt.isforeign);
/*
* Postprocess extended statistics.
*/
transformExtendedStatistics(&cxt);
/*
* Output results.
*/
stmt->tableElts = cxt.columns;
stmt->constraints = cxt.ckconstraints;
stmt->nnconstraints = cxt.nnconstraints;
result = lappend(cxt.blist, stmt);
result = list_concat(result, cxt.alist);
result = list_concat(result, save_alist);
return result;
}
/*
* generateSerialExtraStmts
* Generate CREATE SEQUENCE and ALTER SEQUENCE ... OWNED BY statements
* to create the sequence for a serial or identity column.
*
* This includes determining the name the sequence will have. The caller
* can ask to get back the name components by passing non-null pointers
* for snamespace_p and sname_p.
*/
static void
generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
Oid seqtypid, List *seqoptions,
bool for_identity, bool col_exists,
char **snamespace_p, char **sname_p)
{
ListCell *option;
DefElem *nameEl = NULL;
Oid snamespaceid;
char *snamespace;
char *sname;
CreateSeqStmt *seqstmt;
AlterSeqStmt *altseqstmt;
List *attnamelist;
int nameEl_idx = -1;
/* Make a copy of this as we may end up modifying it in the code below */
seqoptions = list_copy(seqoptions);
/*
* Determine namespace and name to use for the sequence.
*
* First, check if a sequence name was passed in as an option. This is
* used by pg_dump. Else, generate a name.
*
* Although we use ChooseRelationName, it's not guaranteed that the
* selected sequence name won't conflict; given sufficiently long field
* names, two different serial columns in the same table could be assigned
* the same sequence name, and we'd not notice since we aren't creating
* the sequence quite yet. In practice this seems quite unlikely to be a
* problem, especially since few people would need two serial columns in
* one table.
*/
foreach(option, seqoptions)
{
DefElem *defel = lfirst_node(DefElem, option);
if (strcmp(defel->defname, "sequence_name") == 0)
{
if (nameEl)
errorConflictingDefElem(defel, cxt->pstate);
nameEl = defel;
nameEl_idx = foreach_current_index(option);
}
}
if (nameEl)
{
RangeVar *rv = makeRangeVarFromNameList(castNode(List, nameEl->arg));
snamespace = rv->schemaname;
if (!snamespace)
{
/* Given unqualified SEQUENCE NAME, select namespace */
if (cxt->rel)
snamespaceid = RelationGetNamespace(cxt->rel);
else
snamespaceid = RangeVarGetCreationNamespace(cxt->relation);
snamespace = get_namespace_name(snamespaceid);
}
sname = rv->relname;
/* Remove the SEQUENCE NAME item from seqoptions */
seqoptions = list_delete_nth_cell(seqoptions, nameEl_idx);
}
else
{
if (cxt->rel)
snamespaceid = RelationGetNamespace(cxt->rel);
else
{
snamespaceid = RangeVarGetCreationNamespace(cxt->relation);
RangeVarAdjustRelationPersistence(cxt->relation, snamespaceid);
}
snamespace = get_namespace_name(snamespaceid);
sname = ChooseRelationName(cxt->relation->relname,
column->colname,
"seq",
snamespaceid,
false);
}
ereport(DEBUG1,
(errmsg_internal("%s will create implicit sequence \"%s\" for serial column \"%s.%s\"",
cxt->stmtType, sname,
cxt->relation->relname, column->colname)));
/*
* Build a CREATE SEQUENCE command to create the sequence object, and add
* it to the list of things to be done before this CREATE/ALTER TABLE.
*/
seqstmt = makeNode(CreateSeqStmt);
seqstmt->for_identity = for_identity;
seqstmt->sequence = makeRangeVar(snamespace, sname, -1);
seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
seqstmt->options = seqoptions;
/*
* If a sequence data type was specified, add it to the options. Prepend
* to the list rather than append; in case a user supplied their own AS
* clause, the "redundant options" error will point to their occurrence,
* not our synthetic one.
*/
if (seqtypid)
seqstmt->options = lcons(makeDefElem("as",
(Node *) makeTypeNameFromOid(seqtypid, -1),
-1),
seqstmt->options);
/*
* If this is ALTER ADD COLUMN, make sure the sequence will be owned by
* the table's owner. The current user might be someone else (perhaps a
* superuser, or someone who's only a member of the owning role), but the
* SEQUENCE OWNED BY mechanisms will bleat unless table and sequence have
* exactly the same owning role.
*/
if (cxt->rel)
seqstmt->ownerId = cxt->rel->rd_rel->relowner;
else
seqstmt->ownerId = InvalidOid;
cxt->blist = lappend(cxt->blist, seqstmt);
/*
* Store the identity sequence name that we decided on. ALTER TABLE ...
* ADD COLUMN ... IDENTITY needs this so that it can fill the new column
* with values from the sequence, while the association of the sequence
* with the table is not set until after the ALTER TABLE.
*/
column->identitySequence = seqstmt->sequence;
/*
* Build an ALTER SEQUENCE ... OWNED BY command to mark the sequence as
* owned by this column, and add it to the appropriate list of things to
* be done along with this CREATE/ALTER TABLE. In a CREATE or ALTER ADD
* COLUMN, it must be done after the statement because we don't know the
* column's attnum yet. But if we do have the attnum (in AT_AddIdentity),
* we can do the marking immediately, which improves some ALTER TABLE
* behaviors.
*/
altseqstmt = makeNode(AlterSeqStmt);
altseqstmt->sequence = makeRangeVar(snamespace, sname, -1);
attnamelist = list_make3(makeString(snamespace),
makeString(cxt->relation->relname),
makeString(column->colname));
altseqstmt->options = list_make1(makeDefElem("owned_by",
(Node *) attnamelist, -1));
altseqstmt->for_identity = for_identity;
if (col_exists)
cxt->blist = lappend(cxt->blist, altseqstmt);
else
cxt->alist = lappend(cxt->alist, altseqstmt);
if (snamespace_p)
*snamespace_p = snamespace;
if (sname_p)
*sname_p = sname;
}
/*
* transformColumnDefinition -
* transform a single ColumnDef within CREATE TABLE
* Also used in ALTER TABLE ADD COLUMN
*/
static void
transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
{
bool is_serial;
bool saw_nullable;
bool saw_default;
bool saw_identity;
bool saw_generated;
bool need_notnull = false;
ListCell *clist;
cxt->columns = lappend(cxt->columns, column);
/* Check for SERIAL pseudo-types */
is_serial = false;
if (column->typeName
&& list_length(column->typeName->names) == 1
&& !column->typeName->pct_type)
{
char *typname = strVal(linitial(column->typeName->names));
if (strcmp(typname, "smallserial") == 0 ||
strcmp(typname, "serial2") == 0)
{
is_serial = true;
column->typeName->names = NIL;
column->typeName->typeOid = INT2OID;
}
else if (strcmp(typname, "serial") == 0 ||
strcmp(typname, "serial4") == 0)
{
is_serial = true;
column->typeName->names = NIL;
column->typeName->typeOid = INT4OID;
}
else if (strcmp(typname, "bigserial") == 0 ||
strcmp(typname, "serial8") == 0)
{
is_serial = true;
column->typeName->names = NIL;
column->typeName->typeOid = INT8OID;
}
/*
* We have to reject "serial[]" explicitly, because once we've set
* typeid, LookupTypeName won't notice arrayBounds. We don't need any
* special coding for serial(typmod) though.
*/
if (is_serial && column->typeName->arrayBounds != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("array of serial is not implemented"),
parser_errposition(cxt->pstate,
column->typeName->location)));
}
/* Do necessary work on the column type declaration */
if (column->typeName)
transformColumnType(cxt, column);
/* Special actions for SERIAL pseudo-types */
if (is_serial)
{
char *snamespace;
char *sname;
char *qstring;
A_Const *snamenode;
TypeCast *castnode;
FuncCall *funccallnode;
Constraint *constraint;
generateSerialExtraStmts(cxt, column,
column->typeName->typeOid, NIL,
false, false,
&snamespace, &sname);
/*
* Create appropriate constraints for SERIAL. We do this in full,
* rather than shortcutting, so that we will detect any conflicting
* constraints the user wrote (like a different DEFAULT).
*
* Create an expression tree representing the function call
* nextval('sequencename'). We cannot reduce the raw tree to cooked
* form until after the sequence is created, but there's no need to do
* so.
*/
qstring = quote_qualified_identifier(snamespace, sname);
snamenode = makeNode(A_Const);
snamenode->val.node.type = T_String;
snamenode->val.sval.sval = qstring;
snamenode->location = -1;
castnode = makeNode(TypeCast);
castnode->typeName = SystemTypeName("regclass");
castnode->arg = (Node *) snamenode;
castnode->location = -1;
funccallnode = makeFuncCall(SystemFuncName("nextval"),
list_make1(castnode),
COERCE_EXPLICIT_CALL,
-1);
constraint = makeNode(Constraint);
constraint->contype = CONSTR_DEFAULT;
constraint->location = -1;
constraint->raw_expr = (Node *) funccallnode;
constraint->cooked_expr = NULL;
column->constraints = lappend(column->constraints, constraint);
/* have a not-null constraint added later */
need_notnull = true;
}
/* Process column constraints, if any... */
transformConstraintAttrs(cxt, column->constraints);
saw_nullable = false;
saw_default = false;
saw_identity = false;
saw_generated = false;
foreach(clist, column->constraints)
{
Constraint *constraint = lfirst_node(Constraint, clist);
switch (constraint->contype)
{
case CONSTR_NULL:
if ((saw_nullable && column->is_not_null) || need_notnull)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting NULL/NOT NULL declarations for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
column->is_not_null = false;
saw_nullable = true;
break;
case CONSTR_NOTNULL:
/*
* Disallow conflicting [NOT] NULL markings
*/
if (saw_nullable && !column->is_not_null)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting NULL/NOT NULL declarations for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
/* Ignore redundant NOT NULL markings */
/*
* If this is the first time we see this column being marked
* not null, add the constraint entry; and get rid of any
* previous markings to mark the column NOT NULL.
*/
if (!column->is_not_null)
{
column->is_not_null = true;
saw_nullable = true;
constraint->keys = list_make1(makeString(column->colname));
cxt->nnconstraints = lappend(cxt->nnconstraints, constraint);
/* Don't need this anymore, if we had it */
need_notnull = false;
}
break;
case CONSTR_DEFAULT:
if (saw_default)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple default values specified for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
column->raw_default = constraint->raw_expr;
Assert(constraint->cooked_expr == NULL);
saw_default = true;
break;
case CONSTR_IDENTITY:
{
Type ctype;
Oid typeOid;
if (cxt->ofType)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("identity columns are not supported on typed tables")));
if (cxt->partbound)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("identity columns are not supported on partitions")));
ctype = typenameType(cxt->pstate, column->typeName, NULL);
typeOid = ((Form_pg_type) GETSTRUCT(ctype))->oid;
ReleaseSysCache(ctype);
if (saw_identity)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple identity specifications for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
generateSerialExtraStmts(cxt, column,
typeOid, constraint->options,
true, false,
NULL, NULL);
column->identity = constraint->generated_when;
saw_identity = true;
/*
* Identity columns are always NOT NULL, but we may have a
* constraint already.
*/
if (!saw_nullable)
need_notnull = true;
else if (!column->is_not_null)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting NULL/NOT NULL declarations for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
break;
}
case CONSTR_GENERATED:
if (cxt->ofType)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("generated columns are not supported on typed tables")));
if (saw_generated)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple generation clauses specified for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
column->generated = ATTRIBUTE_GENERATED_STORED;
column->raw_default = constraint->raw_expr;
Assert(constraint->cooked_expr == NULL);
saw_generated = true;
break;
case CONSTR_CHECK:
cxt->ckconstraints = lappend(cxt->ckconstraints, constraint);
break;
case CONSTR_PRIMARY:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("primary key constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
/* FALL THRU */
case CONSTR_UNIQUE:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("unique constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
if (constraint->keys == NIL)
constraint->keys = list_make1(makeString(column->colname));
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
case CONSTR_EXCLUSION:
/* grammar does not allow EXCLUDE as a column constraint */
elog(ERROR, "column exclusion constraints are not supported");
break;
case CONSTR_FOREIGN:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("foreign key constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
/*
* Fill in the current attribute's name and throw it into the
* list of FK constraints to be processed later.
*/
constraint->fk_attrs = list_make1(makeString(column->colname));
cxt->fkconstraints = lappend(cxt->fkconstraints, constraint);
break;
case CONSTR_ATTR_DEFERRABLE:
case CONSTR_ATTR_NOT_DEFERRABLE:
case CONSTR_ATTR_DEFERRED:
case CONSTR_ATTR_IMMEDIATE:
/* transformConstraintAttrs took care of these */
break;
default:
elog(ERROR, "unrecognized constraint type: %d",
constraint->contype);
break;
}
if (saw_default && saw_identity)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("both default and identity specified for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
if (saw_default && saw_generated)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("both default and generation expression specified for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
if (saw_identity && saw_generated)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("both identity and generation expression specified for column \"%s\" of table \"%s\"",
column->colname, cxt->relation->relname),
parser_errposition(cxt->pstate,
constraint->location)));
}
/*
* If we need a not-null constraint for SERIAL or IDENTITY, and one was
* not explicitly specified, add one now.
*/
if (need_notnull && !(saw_nullable && column->is_not_null))
{
Constraint *notnull;
column->is_not_null = true;
notnull = makeNode(Constraint);
notnull->contype = CONSTR_NOTNULL;
notnull->conname = NULL;
notnull->deferrable = false;
notnull->initdeferred = false;
notnull->location = -1;
notnull->keys = list_make1(makeString(column->colname));
notnull->skip_validation = false;
notnull->initially_valid = true;
cxt->nnconstraints = lappend(cxt->nnconstraints, notnull);
}
/*
* If needed, generate ALTER FOREIGN TABLE ALTER COLUMN statement to add
* per-column foreign data wrapper options to this column after creation.
*/
if (column->fdwoptions != NIL)
{
AlterTableStmt *stmt;
AlterTableCmd *cmd;
cmd = makeNode(AlterTableCmd);
cmd->subtype = AT_AlterColumnGenericOptions;
cmd->name = column->colname;
cmd->def = (Node *) column->fdwoptions;
cmd->behavior = DROP_RESTRICT;
cmd->missing_ok = false;
stmt = makeNode(AlterTableStmt);
stmt->relation = cxt->relation;
stmt->cmds = NIL;
stmt->objtype = OBJECT_FOREIGN_TABLE;
stmt->cmds = lappend(stmt->cmds, cmd);
cxt->alist = lappend(cxt->alist, stmt);
}
}
/*
* transformTableConstraint
* transform a Constraint node within CREATE TABLE or ALTER TABLE
*/
static void
transformTableConstraint(CreateStmtContext *cxt, Constraint *constraint)
{
switch (constraint->contype)
{
case CONSTR_PRIMARY:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("primary key constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
case CONSTR_UNIQUE:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("unique constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
case CONSTR_EXCLUSION:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("exclusion constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
cxt->ixconstraints = lappend(cxt->ixconstraints, constraint);
break;
case CONSTR_CHECK:
cxt->ckconstraints = lappend(cxt->ckconstraints, constraint);
break;
case CONSTR_NOTNULL:
cxt->nnconstraints = lappend(cxt->nnconstraints, constraint);
break;
case CONSTR_FOREIGN:
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("foreign key constraints are not supported on foreign tables"),
parser_errposition(cxt->pstate,
constraint->location)));
cxt->fkconstraints = lappend(cxt->fkconstraints, constraint);
break;
case CONSTR_NULL:
case CONSTR_DEFAULT:
case CONSTR_ATTR_DEFERRABLE:
case CONSTR_ATTR_NOT_DEFERRABLE:
case CONSTR_ATTR_DEFERRED:
case CONSTR_ATTR_IMMEDIATE:
elog(ERROR, "invalid context for constraint type %d",
constraint->contype);
break;
default:
elog(ERROR, "unrecognized constraint type: %d",
constraint->contype);
break;
}
}
/*
* transformTableLikeClause
*
* Change the LIKE <srctable> portion of a CREATE TABLE statement into
* column definitions that recreate the user defined column portions of
* <srctable>. Also, if there are any LIKE options that we can't fully
* process at this point, add the TableLikeClause to cxt->likeclauses, which
* will cause utility.c to call expandTableLikeClause() after the new
* table has been created.
*/
static void
transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_clause)
{
AttrNumber parent_attno;
Relation relation;
TupleDesc tupleDesc;
AclResult aclresult;
char *comment;
ParseCallbackState pcbstate;
bool process_notnull_constraints = false;
setup_parser_errposition_callback(&pcbstate, cxt->pstate,
table_like_clause->relation->location);
/* we could support LIKE in many cases, but worry about it another day */
if (cxt->isforeign)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("LIKE is not supported for creating foreign tables")));
/* Open the relation referenced by the LIKE clause */
relation = relation_openrv(table_like_clause->relation, AccessShareLock);
if (relation->rd_rel->relkind != RELKIND_RELATION &&
relation->rd_rel->relkind != RELKIND_VIEW &&
relation->rd_rel->relkind != RELKIND_MATVIEW &&
relation->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("relation \"%s\" is invalid in LIKE clause",
RelationGetRelationName(relation)),
errdetail_relkind_not_supported(relation->rd_rel->relkind)));
cancel_parser_errposition_callback(&pcbstate);
/*
* Check for privileges
*/
if (relation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
{
aclresult = object_aclcheck(TypeRelationId, relation->rd_rel->reltype, GetUserId(),
ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, OBJECT_TYPE,
RelationGetRelationName(relation));
}
else
{
aclresult = pg_class_aclcheck(RelationGetRelid(relation), GetUserId(),
ACL_SELECT);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, get_relkind_objtype(relation->rd_rel->relkind),
RelationGetRelationName(relation));
}
tupleDesc = RelationGetDescr(relation);
/*
* Insert the copied attributes into the cxt for the new table definition.
* We must do this now so that they appear in the table in the relative
* position where the LIKE clause is, as required by SQL99.
*/
for (parent_attno = 1; parent_attno <= tupleDesc->natts;
parent_attno++)
{
Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
parent_attno - 1);
ColumnDef *def;
/*
* Ignore dropped columns in the parent.
*/
if (attribute->attisdropped)
continue;
/*
* Create a new column definition
*/
def = makeColumnDef(NameStr(attribute->attname), attribute->atttypid,
attribute->atttypmod, attribute->attcollation);
/*
* For constraints, ONLY the not-null constraint is inherited by the
* new column definition per SQL99; however we cannot do that
* correctly here, so we leave it for expandTableLikeClause to handle.
*/
if (attribute->attnotnull)
process_notnull_constraints = true;
/*
* Add to column list
*/
cxt->columns = lappend(cxt->columns, def);
/*
* Although we don't transfer the column's default/generation
* expression now, we need to mark it GENERATED if appropriate.
*/
if (attribute->atthasdef && attribute->attgenerated &&
(table_like_clause->options & CREATE_TABLE_LIKE_GENERATED))
def->generated = attribute->attgenerated;
/*
* Copy identity if requested
*/
if (attribute->attidentity &&
(table_like_clause->options & CREATE_TABLE_LIKE_IDENTITY))
{
Oid seq_relid;
List *seq_options;
/*
* find sequence owned by old column; extract sequence parameters;
* build new create sequence command
*/
seq_relid = getIdentitySequence(RelationGetRelid(relation), attribute->attnum, false);
seq_options = sequence_options(seq_relid);
generateSerialExtraStmts(cxt, def,
InvalidOid, seq_options,
true, false,
NULL, NULL);
def->identity = attribute->attidentity;
}
/* Likewise, copy storage if requested */
if (table_like_clause->options & CREATE_TABLE_LIKE_STORAGE)
def->storage = attribute->attstorage;
else
def->storage = 0;
/* Likewise, copy compression if requested */
if ((table_like_clause->options & CREATE_TABLE_LIKE_COMPRESSION) != 0
&& CompressionMethodIsValid(attribute->attcompression))
def->compression =
pstrdup(GetCompressionMethodName(attribute->attcompression));
else
def->compression = NULL;
/* Likewise, copy comment if requested */
if ((table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS) &&
(comment = GetComment(attribute->attrelid,
RelationRelationId,
attribute->attnum)) != NULL)
{
CommentStmt *stmt = makeNode(CommentStmt);
stmt->objtype = OBJECT_COLUMN;
stmt->object = (Node *) list_make3(makeString(cxt->relation->schemaname),
makeString(cxt->relation->relname),
makeString(def->colname));
stmt->comment = comment;
cxt->alist = lappend(cxt->alist, stmt);
}
}
/*
* We cannot yet deal with defaults, CHECK constraints, or indexes, since
* we don't yet know what column numbers the copied columns will have in
* the finished table. If any of those options are specified, add the
* LIKE clause to cxt->likeclauses so that expandTableLikeClause will be
* called after we do know that; in addition, do that if there are any NOT
* NULL constraints, because those must be propagated even if not
* explicitly requested.
*
* In order for this to work, we remember the relation OID so that
* expandTableLikeClause is certain to open the same table.
*/
if ((table_like_clause->options &
(CREATE_TABLE_LIKE_DEFAULTS |
CREATE_TABLE_LIKE_GENERATED |
CREATE_TABLE_LIKE_CONSTRAINTS |
CREATE_TABLE_LIKE_INDEXES)) ||
process_notnull_constraints)
{
table_like_clause->relationOid = RelationGetRelid(relation);
cxt->likeclauses = lappend(cxt->likeclauses, table_like_clause);
}
/*
* If INCLUDING INDEXES is not given and a primary key exists, we need to
* add not-null constraints to the columns covered by the PK (except those
* that already have one.) This is required for backwards compatibility.
*/
if ((table_like_clause->options & CREATE_TABLE_LIKE_INDEXES) == 0)
{
Bitmapset *pkcols;
int x = -1;
Bitmapset *donecols = NULL;
ListCell *lc;
/*
* Obtain a bitmapset of columns on which we'll add not-null
* constraints in expandTableLikeClause, so that we skip this for
* those.
*/
foreach(lc, RelationGetNotNullConstraints(RelationGetRelid(relation), true))
{
CookedConstraint *cooked = (CookedConstraint *) lfirst(lc);
donecols = bms_add_member(donecols, cooked->attnum);
}
pkcols = RelationGetIndexAttrBitmap(relation,
INDEX_ATTR_BITMAP_PRIMARY_KEY);
while ((x = bms_next_member(pkcols, x)) >= 0)
{
Constraint *notnull;
AttrNumber attnum = x + FirstLowInvalidHeapAttributeNumber;
Form_pg_attribute attForm;
/* ignore if we already have one for this column */
if (bms_is_member(attnum, donecols))
continue;
attForm = TupleDescAttr(tupleDesc, attnum - 1);
notnull = makeNode(Constraint);
notnull->contype = CONSTR_NOTNULL;
notnull->conname = NULL;
notnull->is_no_inherit = false;
notnull->deferrable = false;
notnull->initdeferred = false;
notnull->location = -1;
notnull->keys = list_make1(makeString(pstrdup(NameStr(attForm->attname))));
notnull->skip_validation = false;
notnull->initially_valid = true;
cxt->nnconstraints = lappend(cxt->nnconstraints, notnull);
}
}
/*
* We may copy extended statistics if requested, since the representation
* of CreateStatsStmt doesn't depend on column numbers.
*/
if (table_like_clause->options & CREATE_TABLE_LIKE_STATISTICS)
{
List *parent_extstats;
ListCell *l;
parent_extstats = RelationGetStatExtList(relation);
foreach(l, parent_extstats)
{
Oid parent_stat_oid = lfirst_oid(l);
CreateStatsStmt *stats_stmt;
stats_stmt = generateClonedExtStatsStmt(cxt->relation,
RelationGetRelid(relation),
parent_stat_oid);
/* Copy comment on statistics object, if requested */
if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
{
comment = GetComment(parent_stat_oid, StatisticExtRelationId, 0);
/*
* We make use of CreateStatsStmt's stxcomment option, so as
* not to need to know now what name the statistics will have.
*/
stats_stmt->stxcomment = comment;
}
cxt->extstats = lappend(cxt->extstats, stats_stmt);
}
list_free(parent_extstats);
}
/*
* Close the parent rel, but keep our AccessShareLock on it until xact
* commit. That will prevent someone else from deleting or ALTERing the
* parent before we can run expandTableLikeClause.
*/
table_close(relation, NoLock);
}
/*
* expandTableLikeClause
*
* Process LIKE options that require knowing the final column numbers
* assigned to the new table's columns. This executes after we have
* run DefineRelation for the new table. It returns a list of utility
* commands that should be run to generate indexes etc.
*/
List *
expandTableLikeClause(RangeVar *heapRel, TableLikeClause *table_like_clause)
{
List *result = NIL;
List *atsubcmds = NIL;
AttrNumber parent_attno;
Relation relation;
Relation childrel;
TupleDesc tupleDesc;
TupleConstr *constr;
AttrMap *attmap;
char *comment;
bool at_pushed = false;
ListCell *lc;
/*
* Open the relation referenced by the LIKE clause. We should still have
* the table lock obtained by transformTableLikeClause (and this'll throw
* an assertion failure if not). Hence, no need to recheck privileges
* etc. We must open the rel by OID not name, to be sure we get the same
* table.
*/
if (!OidIsValid(table_like_clause->relationOid))
elog(ERROR, "expandTableLikeClause called on untransformed LIKE clause");
relation = relation_open(table_like_clause->relationOid, NoLock);
tupleDesc = RelationGetDescr(relation);
constr = tupleDesc->constr;
/*
* Open the newly-created child relation; we have lock on that too.
*/
childrel = relation_openrv(heapRel, NoLock);
/*
* Construct a map from the LIKE relation's attnos to the child rel's.
* This re-checks type match etc, although it shouldn't be possible to
* have a failure since both tables are locked.
*/
attmap = build_attrmap_by_name(RelationGetDescr(childrel),
tupleDesc,
false);
/*
* Process defaults, if required.
*/
if ((table_like_clause->options &
(CREATE_TABLE_LIKE_DEFAULTS | CREATE_TABLE_LIKE_GENERATED)) &&
constr != NULL)
{
for (parent_attno = 1; parent_attno <= tupleDesc->natts;
parent_attno++)
{
Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
parent_attno - 1);
/*
* Ignore dropped columns in the parent.
*/
if (attribute->attisdropped)
continue;
/*
* Copy default, if present and it should be copied. We have
* separate options for plain default expressions and GENERATED
* defaults.
*/
if (attribute->atthasdef &&
(attribute->attgenerated ?
(table_like_clause->options & CREATE_TABLE_LIKE_GENERATED) :
(table_like_clause->options & CREATE_TABLE_LIKE_DEFAULTS)))
{
Node *this_default;
AlterTableCmd *atsubcmd;
bool found_whole_row;
this_default = TupleDescGetDefault(tupleDesc, parent_attno);
if (this_default == NULL)
elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
parent_attno, RelationGetRelationName(relation));
atsubcmd = makeNode(AlterTableCmd);
atsubcmd->subtype = AT_CookedColumnDefault;
atsubcmd->num = attmap->attnums[parent_attno - 1];
atsubcmd->def = map_variable_attnos(this_default,
1, 0,
attmap,
InvalidOid,
&found_whole_row);
/*
* Prevent this for the same reason as for constraints below.
* Note that defaults cannot contain any vars, so it's OK that
* the error message refers to generated columns.
*/
if (found_whole_row)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot convert whole-row table reference"),
errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
NameStr(attribute->attname),
RelationGetRelationName(relation))));
atsubcmds = lappend(atsubcmds, atsubcmd);
}
}
}
/*
* Copy CHECK constraints if requested, being careful to adjust attribute
* numbers so they match the child.
*/
if ((table_like_clause->options & CREATE_TABLE_LIKE_CONSTRAINTS) &&
constr != NULL)
{
int ccnum;
for (ccnum = 0; ccnum < constr->num_check; ccnum++)
{
char *ccname = constr->check[ccnum].ccname;
char *ccbin = constr->check[ccnum].ccbin;
bool ccnoinherit = constr->check[ccnum].ccnoinherit;
Node *ccbin_node;
bool found_whole_row;
Constraint *n;
AlterTableCmd *atsubcmd;
ccbin_node = map_variable_attnos(stringToNode(ccbin),
1, 0,
attmap,
InvalidOid, &found_whole_row);
/*
* We reject whole-row variables because the whole point of LIKE
* is that the new table's rowtype might later diverge from the
* parent's. So, while translation might be possible right now,
* it wouldn't be possible to guarantee it would work in future.
*/
if (found_whole_row)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot convert whole-row table reference"),
errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
ccname,
RelationGetRelationName(relation))));
n = makeNode(Constraint);
n->contype = CONSTR_CHECK;
n->conname = pstrdup(ccname);
n->location = -1;
n->is_no_inherit = ccnoinherit;
n->raw_expr = NULL;
n->cooked_expr = nodeToString(ccbin_node);
/* We can skip validation, since the new table should be empty. */
n->skip_validation = true;
n->initially_valid = true;
atsubcmd = makeNode(AlterTableCmd);
atsubcmd->subtype = AT_AddConstraint;
atsubcmd->def = (Node *) n;
atsubcmds = lappend(atsubcmds, atsubcmd);
/* Copy comment on constraint */
if ((table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS) &&
(comment = GetComment(get_relation_constraint_oid(RelationGetRelid(relation),
n->conname, false),
ConstraintRelationId,
0)) != NULL)
{
CommentStmt *stmt = makeNode(CommentStmt);
stmt->objtype = OBJECT_TABCONSTRAINT;
stmt->object = (Node *) list_make3(makeString(heapRel->schemaname),
makeString(heapRel->relname),
makeString(n->conname));
stmt->comment = comment;
result = lappend(result, stmt);
}
}
}
/*
* Copy not-null constraints, too (these do not require any option to have
* been given).
*/
foreach(lc, RelationGetNotNullConstraints(RelationGetRelid(relation), false))
{
AlterTableCmd *atsubcmd;
atsubcmd = makeNode(AlterTableCmd);
atsubcmd->subtype = AT_AddConstraint;
atsubcmd->def = (Node *) lfirst_node(Constraint, lc);
atsubcmds = lappend(atsubcmds, atsubcmd);
}
/*
* If we generated any ALTER TABLE actions above, wrap them into a single
* ALTER TABLE command. Stick it at the front of the result, so it runs
* before any CommentStmts we made above.
*/
if (atsubcmds)
{
AlterTableStmt *atcmd = makeNode(AlterTableStmt);
atcmd->relation = copyObject(heapRel);
atcmd->cmds = atsubcmds;
atcmd->objtype = OBJECT_TABLE;
atcmd->missing_ok = false;
result = lcons(atcmd, result);
at_pushed = true;
}
/*
* Process indexes if required.
*/
if ((table_like_clause->options & CREATE_TABLE_LIKE_INDEXES) &&
relation->rd_rel->relhasindex)
{
List *parent_indexes;
ListCell *l;
parent_indexes = RelationGetIndexList(relation);
foreach(l, parent_indexes)
{
Oid parent_index_oid = lfirst_oid(l);
Relation parent_index;
IndexStmt *index_stmt;
parent_index = index_open(parent_index_oid, AccessShareLock);
/* Build CREATE INDEX statement to recreate the parent_index */
index_stmt = generateClonedIndexStmt(heapRel,
parent_index,
attmap,
NULL);
/*
* The PK columns might not yet non-nullable, so make sure they
* become so.
*/
if (index_stmt->primary)
{
foreach(lc, index_stmt->indexParams)
{
IndexElem *col = lfirst_node(IndexElem, lc);
AlterTableCmd *notnullcmd = makeNode(AlterTableCmd);
notnullcmd->subtype = AT_SetAttNotNull;
notnullcmd->name = pstrdup(col->name);
/* Luckily we can still add more AT-subcmds here */
atsubcmds = lappend(atsubcmds, notnullcmd);
}
/*
* If we had already put the AlterTableStmt into the output
* list, we don't need to do so again; otherwise do it.
*/
if (!at_pushed)
{
AlterTableStmt *atcmd = makeNode(AlterTableStmt);
atcmd->relation = copyObject(heapRel);
atcmd->cmds = atsubcmds;
atcmd->objtype = OBJECT_TABLE;
atcmd->missing_ok = false;
result = lcons(atcmd, result);
}
}
/* Copy comment on index, if requested */
if (table_like_clause->options & CREATE_TABLE_LIKE_COMMENTS)
{
comment = GetComment(parent_index_oid, RelationRelationId, 0);
/*
* We make use of IndexStmt's idxcomment option, so as not to
* need to know now what name the index will have.
*/
index_stmt->idxcomment = comment;
}
result = lappend(result, index_stmt);
index_close(parent_index, AccessShareLock);
}
}
/* Done with child rel */
table_close(childrel, NoLock);
/*
* Close the parent rel, but keep our AccessShareLock on it until xact
* commit. That will prevent someone else from deleting or ALTERing the
* parent before the child is committed.
*/
table_close(relation, NoLock);
return result;
}
static void
transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
{
HeapTuple tuple;
TupleDesc tupdesc;
int i;
Oid ofTypeId;
Assert(ofTypename);
tuple = typenameType(NULL, ofTypename, NULL);
check_of_type(tuple);
ofTypeId = ((Form_pg_type) GETSTRUCT(tuple))->oid;
ofTypename->typeOid = ofTypeId; /* cached for later */
tupdesc = lookup_rowtype_tupdesc(ofTypeId, -1);
for (i = 0; i < tupdesc->natts; i++)
{
Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
ColumnDef *n;
if (attr->attisdropped)
continue;
n = makeColumnDef(NameStr(attr->attname), attr->atttypid,
attr->atttypmod, attr->attcollation);
n->is_from_type = true;
cxt->columns = lappend(cxt->columns, n);
}
ReleaseTupleDesc(tupdesc);
ReleaseSysCache(tuple);
}
/*
* Generate an IndexStmt node using information from an already existing index
* "source_idx".
*
* heapRel is stored into the IndexStmt's relation field, but we don't use it
* otherwise; some callers pass NULL, if they don't need it to be valid.
* (The target relation might not exist yet, so we mustn't try to access it.)
*
* Attribute numbers in expression Vars are adjusted according to attmap.
*
* If constraintOid isn't NULL, we store the OID of any constraint associated
* with the index there.
*
* Unlike transformIndexConstraint, we don't make any effort to force primary
* key columns to be not-null. The larger cloning process this is part of
* should have cloned their not-null status separately (and DefineIndex will
* complain if that fails to happen).
*/
IndexStmt *
generateClonedIndexStmt(RangeVar *heapRel, Relation source_idx,
const AttrMap *attmap,
Oid *constraintOid)
{
Oid source_relid = RelationGetRelid(source_idx);
HeapTuple ht_idxrel;
HeapTuple ht_idx;
HeapTuple ht_am;
Form_pg_class idxrelrec;
Form_pg_index idxrec;
Form_pg_am amrec;
oidvector *indcollation;
oidvector *indclass;
IndexStmt *index;
List *indexprs;
ListCell *indexpr_item;
Oid indrelid;
int keyno;
Oid keycoltype;
Datum datum;
bool isnull;
if (constraintOid)
*constraintOid = InvalidOid;
/*
* Fetch pg_class tuple of source index. We can't use the copy in the
* relcache entry because it doesn't include optional fields.
*/
ht_idxrel = SearchSysCache1(RELOID, ObjectIdGetDatum(source_relid));
if (!HeapTupleIsValid(ht_idxrel))
elog(ERROR, "cache lookup failed for relation %u", source_relid);
idxrelrec = (Form_pg_class) GETSTRUCT(ht_idxrel);
/* Fetch pg_index tuple for source index from relcache entry */
ht_idx = source_idx->rd_indextuple;
idxrec = (Form_pg_index) GETSTRUCT(ht_idx);
indrelid = idxrec->indrelid;
/* Fetch the pg_am tuple of the index' access method */
ht_am = SearchSysCache1(AMOID, ObjectIdGetDatum(idxrelrec->relam));
if (!HeapTupleIsValid(ht_am))
elog(ERROR, "cache lookup failed for access method %u",
idxrelrec->relam);
amrec = (Form_pg_am) GETSTRUCT(ht_am);
/* Extract indcollation from the pg_index tuple */
datum = SysCacheGetAttrNotNull(INDEXRELID, ht_idx,
Anum_pg_index_indcollation);
indcollation = (oidvector *) DatumGetPointer(datum);
/* Extract indclass from the pg_index tuple */
datum = SysCacheGetAttrNotNull(INDEXRELID, ht_idx, Anum_pg_index_indclass);
indclass = (oidvector *) DatumGetPointer(datum);
/* Begin building the IndexStmt */
index = makeNode(IndexStmt);
index->relation = heapRel;
index->accessMethod = pstrdup(NameStr(amrec->amname));
if (OidIsValid(idxrelrec->reltablespace))
index->tableSpace = get_tablespace_name(idxrelrec->reltablespace);
else
index->tableSpace = NULL;
index->excludeOpNames = NIL;
index->idxcomment = NULL;
index->indexOid = InvalidOid;
index->oldNumber = InvalidRelFileNumber;
index->oldCreateSubid = InvalidSubTransactionId;
index->oldFirstRelfilelocatorSubid = InvalidSubTransactionId;
index->unique = idxrec->indisunique;
index->nulls_not_distinct = idxrec->indnullsnotdistinct;
index->primary = idxrec->indisprimary;
index->transformed = true; /* don't need transformIndexStmt */
index->concurrent = false;
index->if_not_exists = false;
index->reset_default_tblspc = false;
/*
* We don't try to preserve the name of the source index; instead, just
* let DefineIndex() choose a reasonable name. (If we tried to preserve
* the name, we'd get duplicate-relation-name failures unless the source
* table was in a different schema.)
*/
index->idxname = NULL;
/*
* If the index is marked PRIMARY or has an exclusion condition, it's
* certainly from a constraint; else, if it's not marked UNIQUE, it
* certainly isn't. If it is or might be from a constraint, we have to
* fetch the pg_constraint record.
*/
if (index->primary || index->unique || idxrec->indisexclusion)
{
Oid constraintId = get_index_constraint(source_relid);
if (OidIsValid(constraintId))
{
HeapTuple ht_constr;
Form_pg_constraint conrec;
if (constraintOid)
*constraintOid = constraintId;
ht_constr = SearchSysCache1(CONSTROID,
ObjectIdGetDatum(constraintId));
if (!HeapTupleIsValid(ht_constr))
elog(ERROR, "cache lookup failed for constraint %u",
constraintId);
conrec = (Form_pg_constraint) GETSTRUCT(ht_constr);
index->isconstraint = true;
index->deferrable = conrec->condeferrable;
index->initdeferred = conrec->condeferred;
/* If it's an exclusion constraint, we need the operator names */
if (idxrec->indisexclusion)
{
Datum *elems;
int nElems;
int i;
Assert(conrec->contype == CONSTRAINT_EXCLUSION);
/* Extract operator OIDs from the pg_constraint tuple */
datum = SysCacheGetAttrNotNull(CONSTROID, ht_constr,
Anum_pg_constraint_conexclop);
deconstruct_array_builtin(DatumGetArrayTypeP(datum), OIDOID, &elems, NULL, &nElems);
for (i = 0; i < nElems; i++)
{
Oid operid = DatumGetObjectId(elems[i]);
HeapTuple opertup;
Form_pg_operator operform;
char *oprname;
char *nspname;
List *namelist;
opertup = SearchSysCache1(OPEROID,
ObjectIdGetDatum(operid));
if (!HeapTupleIsValid(opertup))
elog(ERROR, "cache lookup failed for operator %u",
operid);
operform = (Form_pg_operator) GETSTRUCT(opertup);
oprname = pstrdup(NameStr(operform->oprname));
/* For simplicity we always schema-qualify the op name */
nspname = get_namespace_name(operform->oprnamespace);
namelist = list_make2(makeString(nspname),
makeString(oprname));
index->excludeOpNames = lappend(index->excludeOpNames,
namelist);
ReleaseSysCache(opertup);
}
}
ReleaseSysCache(ht_constr);
}
else
index->isconstraint = false;
}
else
index->isconstraint = false;
/* Get the index expressions, if any */
datum = SysCacheGetAttr(INDEXRELID, ht_idx,
Anum_pg_index_indexprs, &isnull);
if (!isnull)
{
char *exprsString;
exprsString = TextDatumGetCString(datum);
indexprs = (List *) stringToNode(exprsString);
}
else
indexprs = NIL;
/* Build the list of IndexElem */
index->indexParams = NIL;
index->indexIncludingParams = NIL;
indexpr_item = list_head(indexprs);
for (keyno = 0; keyno < idxrec->indnkeyatts; keyno++)
{
IndexElem *iparam;
AttrNumber attnum = idxrec->indkey.values[keyno];
Form_pg_attribute attr = TupleDescAttr(RelationGetDescr(source_idx),
keyno);
int16 opt = source_idx->rd_indoption[keyno];
iparam = makeNode(IndexElem);
if (AttributeNumberIsValid(attnum))
{
/* Simple index column */
char *attname;
attname = get_attname(indrelid, attnum, false);
keycoltype = get_atttype(indrelid, attnum);
iparam->name = attname;
iparam->expr = NULL;
}
else
{
/* Expressional index */
Node *indexkey;
bool found_whole_row;
if (indexpr_item == NULL)
elog(ERROR, "too few entries in indexprs list");
indexkey = (Node *) lfirst(indexpr_item);
indexpr_item = lnext(indexprs, indexpr_item);
/* Adjust Vars to match new table's column numbering */
indexkey = map_variable_attnos(indexkey,
1, 0,
attmap,
InvalidOid, &found_whole_row);
/* As in expandTableLikeClause, reject whole-row variables */
if (found_whole_row)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot convert whole-row table reference"),
errdetail("Index \"%s\" contains a whole-row table reference.",
RelationGetRelationName(source_idx))));
iparam->name = NULL;
iparam->expr = indexkey;
keycoltype = exprType(indexkey);
}
/* Copy the original index column name */
iparam->indexcolname = pstrdup(NameStr(attr->attname));
/* Add the collation name, if non-default */
iparam->collation = get_collation(indcollation->values[keyno], keycoltype);
/* Add the operator class name, if non-default */
iparam->opclass = get_opclass(indclass->values[keyno], keycoltype);
iparam->opclassopts =
untransformRelOptions(get_attoptions(source_relid, keyno + 1));
iparam->ordering = SORTBY_DEFAULT;
iparam->nulls_ordering = SORTBY_NULLS_DEFAULT;
/* Adjust options if necessary */
if (source_idx->rd_indam->amcanorder)
{
/*
* If it supports sort ordering, copy DESC and NULLS opts. Don't
* set non-default settings unnecessarily, though, so as to
* improve the chance of recognizing equivalence to constraint
* indexes.
*/
if (opt & INDOPTION_DESC)
{
iparam->ordering = SORTBY_DESC;
if ((opt & INDOPTION_NULLS_FIRST) == 0)
iparam->nulls_ordering = SORTBY_NULLS_LAST;
}
else
{
if (opt & INDOPTION_NULLS_FIRST)
iparam->nulls_ordering = SORTBY_NULLS_FIRST;
}
}
index->indexParams = lappend(index->indexParams, iparam);
}
/* Handle included columns separately */
for (keyno = idxrec->indnkeyatts; keyno < idxrec->indnatts; keyno++)
{
IndexElem *iparam;
AttrNumber attnum = idxrec->indkey.values[keyno];
Form_pg_attribute attr = TupleDescAttr(RelationGetDescr(source_idx),
keyno);
iparam = makeNode(IndexElem);
if (AttributeNumberIsValid(attnum))
{
/* Simple index column */
char *attname;
attname = get_attname(indrelid, attnum, false);
iparam->name = attname;
iparam->expr = NULL;
}
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("expressions are not supported in included columns")));
/* Copy the original index column name */
iparam->indexcolname = pstrdup(NameStr(attr->attname));
index->indexIncludingParams = lappend(index->indexIncludingParams, iparam);
}
/* Copy reloptions if any */
datum = SysCacheGetAttr(RELOID, ht_idxrel,
Anum_pg_class_reloptions, &isnull);
if (!isnull)
index->options = untransformRelOptions(datum);
/* If it's a partial index, decompile and append the predicate */
datum = SysCacheGetAttr(INDEXRELID, ht_idx,
Anum_pg_index_indpred, &isnull);
if (!isnull)
{
char *pred_str;
Node *pred_tree;
bool found_whole_row;
/* Convert text string to node tree */
pred_str = TextDatumGetCString(datum);
pred_tree = (Node *) stringToNode(pred_str);
/* Adjust Vars to match new table's column numbering */
pred_tree = map_variable_attnos(pred_tree,
1, 0,
attmap,
InvalidOid, &found_whole_row);
/* As in expandTableLikeClause, reject whole-row variables */
if (found_whole_row)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot convert whole-row table reference"),
errdetail("Index \"%s\" contains a whole-row table reference.",
RelationGetRelationName(source_idx))));
index->whereClause = pred_tree;
}
/* Clean up */
ReleaseSysCache(ht_idxrel);
ReleaseSysCache(ht_am);
return index;
}
/*
* Generate a CreateStatsStmt node using information from an already existing
* extended statistic "source_statsid", for the rel identified by heapRel and
* heapRelid.
*/
static CreateStatsStmt *
generateClonedExtStatsStmt(RangeVar *heapRel, Oid heapRelid,
Oid source_statsid)
{
HeapTuple ht_stats;
Form_pg_statistic_ext statsrec;
CreateStatsStmt *stats;
List *stat_types = NIL;
List *def_names = NIL;
bool isnull;
Datum datum;
ArrayType *arr;
char *enabled;
int i;
Assert(OidIsValid(heapRelid));
Assert(heapRel != NULL);
/*
* Fetch pg_statistic_ext tuple of source statistics object.
*/
ht_stats = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(source_statsid));
if (!HeapTupleIsValid(ht_stats))
elog(ERROR, "cache lookup failed for statistics object %u", source_statsid);
statsrec = (Form_pg_statistic_ext) GETSTRUCT(ht_stats);
/* Determine which statistics types exist */
datum = SysCacheGetAttrNotNull(STATEXTOID, ht_stats,
Anum_pg_statistic_ext_stxkind);
arr = DatumGetArrayTypeP(datum);
if (ARR_NDIM(arr) != 1 ||
ARR_HASNULL(arr) ||
ARR_ELEMTYPE(arr) != CHAROID)
elog(ERROR, "stxkind is not a 1-D char array");
enabled = (char *) ARR_DATA_PTR(arr);
for (i = 0; i < ARR_DIMS(arr)[0]; i++)
{
if (enabled[i] == STATS_EXT_NDISTINCT)
stat_types = lappend(stat_types, makeString("ndistinct"));
else if (enabled[i] == STATS_EXT_DEPENDENCIES)
stat_types = lappend(stat_types, makeString("dependencies"));
else if (enabled[i] == STATS_EXT_MCV)
stat_types = lappend(stat_types, makeString("mcv"));
else if (enabled[i] == STATS_EXT_EXPRESSIONS)
/* expression stats are not exposed to users */
continue;
else
elog(ERROR, "unrecognized statistics kind %c", enabled[i]);
}
/* Determine which columns the statistics are on */
for (i = 0; i < statsrec->stxkeys.dim1; i++)
{
StatsElem *selem = makeNode(StatsElem);
AttrNumber attnum = statsrec->stxkeys.values[i];
selem->name = get_attname(heapRelid, attnum, false);
selem->expr = NULL;
def_names = lappend(def_names, selem);
}
/*
* Now handle expressions, if there are any. The order (with respect to
* regular attributes) does not really matter for extended stats, so we
* simply append them after simple column references.
*
* XXX Some places during build/estimation treat expressions as if they
* are before attributes, but for the CREATE command that's entirely
* irrelevant.
*/
datum = SysCacheGetAttr(STATEXTOID, ht_stats,
Anum_pg_statistic_ext_stxexprs, &isnull);
if (!isnull)
{
ListCell *lc;
List *exprs = NIL;
char *exprsString;
exprsString = TextDatumGetCString(datum);
exprs = (List *) stringToNode(exprsString);
foreach(lc, exprs)
{
StatsElem *selem = makeNode(StatsElem);
selem->name = NULL;
selem->expr = (Node *) lfirst(lc);
def_names = lappend(def_names, selem);
}
pfree(exprsString);
}
/* finally, build the output node */
stats = makeNode(CreateStatsStmt);
stats->defnames = NULL;
stats->stat_types = stat_types;
stats->exprs = def_names;
stats->relations = list_make1(heapRel);
stats->stxcomment = NULL;
stats->transformed = true; /* don't need transformStatsStmt again */
stats->if_not_exists = false;
/* Clean up */
ReleaseSysCache(ht_stats);
return stats;
}
/*
* get_collation - fetch qualified name of a collation
*
* If collation is InvalidOid or is the default for the given actual_datatype,
* then the return value is NIL.
*/
static List *
get_collation(Oid collation, Oid actual_datatype)
{
List *result;
HeapTuple ht_coll;
Form_pg_collation coll_rec;
char *nsp_name;
char *coll_name;
if (!OidIsValid(collation))
return NIL; /* easy case */
if (collation == get_typcollation(actual_datatype))
return NIL; /* just let it default */
ht_coll = SearchSysCache1(COLLOID, ObjectIdGetDatum(collation));
if (!HeapTupleIsValid(ht_coll))
elog(ERROR, "cache lookup failed for collation %u", collation);
coll_rec = (Form_pg_collation) GETSTRUCT(ht_coll);
/* For simplicity, we always schema-qualify the name */
nsp_name = get_namespace_name(coll_rec->collnamespace);
coll_name = pstrdup(NameStr(coll_rec->collname));
result = list_make2(makeString(nsp_name), makeString(coll_name));
ReleaseSysCache(ht_coll);
return result;
}
/*
* get_opclass - fetch qualified name of an index operator class
*
* If the opclass is the default for the given actual_datatype, then
* the return value is NIL.
*/
static List *
get_opclass(Oid opclass, Oid actual_datatype)
{
List *result = NIL;
HeapTuple ht_opc;
Form_pg_opclass opc_rec;
ht_opc = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclass));
if (!HeapTupleIsValid(ht_opc))
elog(ERROR, "cache lookup failed for opclass %u", opclass);
opc_rec = (Form_pg_opclass) GETSTRUCT(ht_opc);
if (GetDefaultOpClass(actual_datatype, opc_rec->opcmethod) != opclass)
{
/* For simplicity, we always schema-qualify the name */
char *nsp_name = get_namespace_name(opc_rec->opcnamespace);
char *opc_name = pstrdup(NameStr(opc_rec->opcname));
result = list_make2(makeString(nsp_name), makeString(opc_name));
}
ReleaseSysCache(ht_opc);
return result;
}
/*
* transformIndexConstraints
* Handle UNIQUE, PRIMARY KEY, EXCLUDE constraints, which create indexes.
* We also merge in any index definitions arising from
* LIKE ... INCLUDING INDEXES.
*/
static void
transformIndexConstraints(CreateStmtContext *cxt)
{
IndexStmt *index;
List *indexlist = NIL;
List *finalindexlist = NIL;
ListCell *lc;
/*
* Run through the constraints that need to generate an index, and do so.
*
* For PRIMARY KEY, in addition we set each column's attnotnull flag true.
* We do not create a separate not-null constraint, as that would be
* redundant: the PRIMARY KEY constraint itself fulfills that role. Other
* constraint types don't need any not-null markings.
*/
foreach(lc, cxt->ixconstraints)
{
Constraint *constraint = lfirst_node(Constraint, lc);
Assert(constraint->contype == CONSTR_PRIMARY ||
constraint->contype == CONSTR_UNIQUE ||
constraint->contype == CONSTR_EXCLUSION);
index = transformIndexConstraint(constraint, cxt);
indexlist = lappend(indexlist, index);
}
/*
* Scan the index list and remove any redundant index specifications. This
* can happen if, for instance, the user writes UNIQUE PRIMARY KEY. A
* strict reading of SQL would suggest raising an error instead, but that
* strikes me as too anal-retentive. - tgl 2001-02-14
*
* XXX in ALTER TABLE case, it'd be nice to look for duplicate
* pre-existing indexes, too.
*/
if (cxt->pkey != NULL)
{
/* Make sure we keep the PKEY index in preference to others... */
finalindexlist = list_make1(cxt->pkey);
}
foreach(lc, indexlist)
{
bool keep = true;
ListCell *k;
index = lfirst(lc);
/* if it's pkey, it's already in finalindexlist */
if (index == cxt->pkey)
continue;
foreach(k, finalindexlist)
{
IndexStmt *priorindex = lfirst(k);
if (equal(index->indexParams, priorindex->indexParams) &&
equal(index->indexIncludingParams, priorindex->indexIncludingParams) &&
equal(index->whereClause, priorindex->whereClause) &&
equal(index->excludeOpNames, priorindex->excludeOpNames) &&
strcmp(index->accessMethod, priorindex->accessMethod) == 0 &&
index->nulls_not_distinct == priorindex->nulls_not_distinct &&
index->deferrable == priorindex->deferrable &&
index->initdeferred == priorindex->initdeferred)
{
priorindex->unique |= index->unique;
/*
* If the prior index is as yet unnamed, and this one is
* named, then transfer the name to the prior index. This
* ensures that if we have named and unnamed constraints,
* we'll use (at least one of) the names for the index.
*/
if (priorindex->idxname == NULL)
priorindex->idxname = index->idxname;
keep = false;
break;
}
}
if (keep)
finalindexlist = lappend(finalindexlist, index);
}
/*
* Now append all the IndexStmts to cxt->alist.
*/
cxt->alist = list_concat(cxt->alist, finalindexlist);
}
/*
* transformIndexConstraint
* Transform one UNIQUE, PRIMARY KEY, or EXCLUDE constraint for
* transformIndexConstraints. An IndexStmt is returned.
*
* For a PRIMARY KEY constraint, we additionally force the columns to be
* marked as not-null, without producing a not-null constraint.
*/
static IndexStmt *
transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
{
IndexStmt *index;
List *notnullcmds = NIL;
ListCell *lc;
index = makeNode(IndexStmt);
index->unique = (constraint->contype != CONSTR_EXCLUSION);
index->primary = (constraint->contype == CONSTR_PRIMARY);
if (index->primary)
{
if (cxt->pkey != NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("multiple primary keys for table \"%s\" are not allowed",
cxt->relation->relname),
parser_errposition(cxt->pstate, constraint->location)));
cxt->pkey = index;
/*
* In ALTER TABLE case, a primary index might already exist, but
* DefineIndex will check for it.
*/
}
index->nulls_not_distinct = constraint->nulls_not_distinct;
index->isconstraint = true;
index->deferrable = constraint->deferrable;
index->initdeferred = constraint->initdeferred;
if (constraint->conname != NULL)
index->idxname = pstrdup(constraint->conname);
else
index->idxname = NULL; /* DefineIndex will choose name */
index->relation = cxt->relation;
index->accessMethod = constraint->access_method ? constraint->access_method : DEFAULT_INDEX_TYPE;
index->options = constraint->options;
index->tableSpace = constraint->indexspace;
index->whereClause = constraint->where_clause;
index->indexParams = NIL;
index->indexIncludingParams = NIL;
index->excludeOpNames = NIL;
index->idxcomment = NULL;
index->indexOid = InvalidOid;
index->oldNumber = InvalidRelFileNumber;
index->oldCreateSubid = InvalidSubTransactionId;
index->oldFirstRelfilelocatorSubid = InvalidSubTransactionId;
index->transformed = false;
index->concurrent = false;
index->if_not_exists = false;
index->reset_default_tblspc = constraint->reset_default_tblspc;
/*
* If it's ALTER TABLE ADD CONSTRAINT USING INDEX, look up the index and
* verify it's usable, then extract the implied column name list. (We
* will not actually need the column name list at runtime, but we need it
* now to check for duplicate column entries below.)
*/
if (constraint->indexname != NULL)
{
char *index_name = constraint->indexname;
Relation heap_rel = cxt->rel;
Oid index_oid;
Relation index_rel;
Form_pg_index index_form;
oidvector *indclass;
Datum indclassDatum;
int i;
/* Grammar should not allow this with explicit column list */
Assert(constraint->keys == NIL);
/* Grammar should only allow PRIMARY and UNIQUE constraints */
Assert(constraint->contype == CONSTR_PRIMARY ||
constraint->contype == CONSTR_UNIQUE);
/* Must be ALTER, not CREATE, but grammar doesn't enforce that */
if (!cxt->isalter)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot use an existing index in CREATE TABLE"),
parser_errposition(cxt->pstate, constraint->location)));
/* Look for the index in the same schema as the table */
index_oid = get_relname_relid(index_name, RelationGetNamespace(heap_rel));
if (!OidIsValid(index_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("index \"%s\" does not exist", index_name),
parser_errposition(cxt->pstate, constraint->location)));
/* Open the index (this will throw an error if it is not an index) */
index_rel = index_open(index_oid, AccessShareLock);
index_form = index_rel->rd_index;
/* Check that it does not have an associated constraint already */
if (OidIsValid(get_index_constraint(index_oid)))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("index \"%s\" is already associated with a constraint",
index_name),
parser_errposition(cxt->pstate, constraint->location)));
/* Perform validity checks on the index */
if (index_form->indrelid != RelationGetRelid(heap_rel))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("index \"%s\" does not belong to table \"%s\"",
index_name, RelationGetRelationName(heap_rel)),
parser_errposition(cxt->pstate, constraint->location)));
if (!index_form->indisvalid)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("index \"%s\" is not valid", index_name),
parser_errposition(cxt->pstate, constraint->location)));
if (!index_form->indisunique)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is not a unique index", index_name),
errdetail("Cannot create a primary key or unique constraint using such an index."),
parser_errposition(cxt->pstate, constraint->location)));
if (RelationGetIndexExpressions(index_rel) != NIL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("index \"%s\" contains expressions", index_name),
errdetail("Cannot create a primary key or unique constraint using such an index."),
parser_errposition(cxt->pstate, constraint->location)));
if (RelationGetIndexPredicate(index_rel) != NIL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is a partial index", index_name),
errdetail("Cannot create a primary key or unique constraint using such an index."),
parser_errposition(cxt->pstate, constraint->location)));
/*
* It's probably unsafe to change a deferred index to non-deferred. (A
* non-constraint index couldn't be deferred anyway, so this case
* should never occur; no need to sweat, but let's check it.)
*/
if (!index_form->indimmediate && !constraint->deferrable)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is a deferrable index", index_name),
errdetail("Cannot create a non-deferrable constraint using a deferrable index."),
parser_errposition(cxt->pstate, constraint->location)));
/*
* Insist on it being a btree. That's the only kind that supports
* uniqueness at the moment anyway; but we must have an index that
* exactly matches what you'd get from plain ADD CONSTRAINT syntax,
* else dump and reload will produce a different index (breaking
* pg_upgrade in particular).
*/
if (index_rel->rd_rel->relam != get_index_am_oid(DEFAULT_INDEX_TYPE, false))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("index \"%s\" is not a btree", index_name),
parser_errposition(cxt->pstate, constraint->location)));
/* Must get indclass the hard way */
indclassDatum = SysCacheGetAttrNotNull(INDEXRELID,
index_rel->rd_indextuple,
Anum_pg_index_indclass);
indclass = (oidvector *) DatumGetPointer(indclassDatum);
for (i = 0; i < index_form->indnatts; i++)
{
int16 attnum = index_form->indkey.values[i];
const FormData_pg_attribute *attform;
char *attname;
Oid defopclass;
/*
* We shouldn't see attnum == 0 here, since we already rejected
* expression indexes. If we do, SystemAttributeDefinition will
* throw an error.
*/
if (attnum > 0)
{
Assert(attnum <= heap_rel->rd_att->natts);
attform = TupleDescAttr(heap_rel->rd_att, attnum - 1);
}
else
attform = SystemAttributeDefinition(attnum);
attname = pstrdup(NameStr(attform->attname));
if (i < index_form->indnkeyatts)
{
/*
* Insist on default opclass, collation, and sort options.
* While the index would still work as a constraint with
* non-default settings, it might not provide exactly the same
* uniqueness semantics as you'd get from a normally-created
* constraint; and there's also the dump/reload problem
* mentioned above.
*/
Datum attoptions =
get_attoptions(RelationGetRelid(index_rel), i + 1);
defopclass = GetDefaultOpClass(attform->atttypid,
index_rel->rd_rel->relam);
if (indclass->values[i] != defopclass ||
attform->attcollation != index_rel->rd_indcollation[i] ||
attoptions != (Datum) 0 ||
index_rel->rd_indoption[i] != 0)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("index \"%s\" column number %d does not have default sorting behavior", index_name, i + 1),
errdetail("Cannot create a primary key or unique constraint using such an index."),
parser_errposition(cxt->pstate, constraint->location)));
constraint->keys = lappend(constraint->keys, makeString(attname));
}
else
constraint->including = lappend(constraint->including, makeString(attname));
}
/* Close the index relation but keep the lock */
relation_close(index_rel, NoLock);
index->indexOid = index_oid;
}
/*
* If it's an EXCLUDE constraint, the grammar returns a list of pairs of
* IndexElems and operator names. We have to break that apart into
* separate lists.
*/
if (constraint->contype == CONSTR_EXCLUSION)
{
foreach(lc, constraint->exclusions)
{
List *pair = (List *) lfirst(lc);
IndexElem *elem;
List *opname;
Assert(list_length(pair) == 2);
elem = linitial_node(IndexElem, pair);
opname = lsecond_node(List, pair);
index->indexParams = lappend(index->indexParams, elem);
index->excludeOpNames = lappend(index->excludeOpNames, opname);
}
}
/*
* For UNIQUE and PRIMARY KEY, we just have a list of column names.
*
* Make sure referenced keys exist. If we are making a PRIMARY KEY index,
* also make sure they are not-null.
*/
else
{
foreach(lc, constraint->keys)
{
char *key = strVal(lfirst(lc));
bool found = false;
ColumnDef *column = NULL;
ListCell *columns;
IndexElem *iparam;
/* Make sure referenced column exists. */
foreach(columns, cxt->columns)
{
column = lfirst_node(ColumnDef, columns);
if (strcmp(column->colname, key) == 0)
{
found = true;
break;
}
}
if (found)
{
/*
* column is defined in the new table. For PRIMARY KEY, we
* can apply the not-null constraint cheaply here ... unless
* the column is marked is_from_type, in which case marking it
* here would be ineffective (see MergeAttributes). Note that
* this isn't effective in ALTER TABLE either, unless the
* column is being added in the same command.
*/
if (constraint->contype == CONSTR_PRIMARY &&
!column->is_from_type)
{
column->is_not_null = true;
}
}
else if (SystemAttributeByName(key) != NULL)
{
/*
* column will be a system column in the new table, so accept
* it. System columns can't ever be null, so no need to worry
* about PRIMARY/NOT NULL constraint.
*/
found = true;
}
else if (cxt->inhRelations)
{
/* try inherited tables */
ListCell *inher;
foreach(inher, cxt->inhRelations)
{
RangeVar *inh = lfirst_node(RangeVar, inher);
Relation rel;
int count;
rel = table_openrv(inh, AccessShareLock);
/* check user requested inheritance from valid relkind */
if (rel->rd_rel->relkind != RELKIND_RELATION &&
rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("inherited relation \"%s\" is not a table or foreign table",
inh->relname)));
for (count = 0; count < rel->rd_att->natts; count++)
{
Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
count);
char *inhname = NameStr(inhattr->attname);
if (inhattr->attisdropped)
continue;
if (strcmp(key, inhname) == 0)
{
found = true;
break;
}
}
table_close(rel, NoLock);
if (found)
break;
}
}
/*
* In the ALTER TABLE case, don't complain about index keys not
* created in the command; they may well exist already.
* DefineIndex will complain about them if not.
*/
if (!found && !cxt->isalter)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" named in key does not exist", key),
parser_errposition(cxt->pstate, constraint->location)));
/* Check for PRIMARY KEY(foo, foo) */
foreach(columns, index->indexParams)
{
iparam = (IndexElem *) lfirst(columns);
if (iparam->name && strcmp(key, iparam->name) == 0)
{
if (index->primary)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" appears twice in primary key constraint",
key),
parser_errposition(cxt->pstate, constraint->location)));
else
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" appears twice in unique constraint",
key),
parser_errposition(cxt->pstate, constraint->location)));
}
}
/* OK, add it to the index definition */
iparam = makeNode(IndexElem);
iparam->name = pstrdup(key);
iparam->expr = NULL;
iparam->indexcolname = NULL;
iparam->collation = NIL;
iparam->opclass = NIL;
iparam->opclassopts = NIL;
iparam->ordering = SORTBY_DEFAULT;
iparam->nulls_ordering = SORTBY_NULLS_DEFAULT;
index->indexParams = lappend(index->indexParams, iparam);
if (constraint->contype == CONSTR_PRIMARY)
{
AlterTableCmd *notnullcmd = makeNode(AlterTableCmd);
notnullcmd->subtype = AT_SetAttNotNull;
notnullcmd->name = pstrdup(key);
notnullcmds = lappend(notnullcmds, notnullcmd);
}
}
}
/*
* Add included columns to index definition. This is much like the
* simple-column-name-list code above, except that we don't worry about
* NOT NULL marking; included columns in a primary key should not be
* forced NOT NULL. We don't complain about duplicate columns, either,
* though maybe we should?
*/
foreach(lc, constraint->including)
{
char *key = strVal(lfirst(lc));
bool found = false;
ColumnDef *column = NULL;
ListCell *columns;
IndexElem *iparam;
foreach(columns, cxt->columns)
{
column = lfirst_node(ColumnDef, columns);
if (strcmp(column->colname, key) == 0)
{
found = true;
break;
}
}
if (!found)
{
if (SystemAttributeByName(key) != NULL)
{
/*
* column will be a system column in the new table, so accept
* it.
*/
found = true;
}
else if (cxt->inhRelations)
{
/* try inherited tables */
ListCell *inher;
foreach(inher, cxt->inhRelations)
{
RangeVar *inh = lfirst_node(RangeVar, inher);
Relation rel;
int count;
rel = table_openrv(inh, AccessShareLock);
/* check user requested inheritance from valid relkind */
if (rel->rd_rel->relkind != RELKIND_RELATION &&
rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("inherited relation \"%s\" is not a table or foreign table",
inh->relname)));
for (count = 0; count < rel->rd_att->natts; count++)
{
Form_pg_attribute inhattr = TupleDescAttr(rel->rd_att,
count);
char *inhname = NameStr(inhattr->attname);
if (inhattr->attisdropped)
continue;
if (strcmp(key, inhname) == 0)
{
found = true;
break;
}
}
table_close(rel, NoLock);
if (found)
break;
}
}
}
/*
* In the ALTER TABLE case, don't complain about index keys not
* created in the command; they may well exist already. DefineIndex
* will complain about them if not.
*/
if (!found && !cxt->isalter)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" named in key does not exist", key),
parser_errposition(cxt->pstate, constraint->location)));
/* OK, add it to the index definition */
iparam = makeNode(IndexElem);
iparam->name = pstrdup(key);
iparam->expr = NULL;
iparam->indexcolname = NULL;
iparam->collation = NIL;
iparam->opclass = NIL;
iparam->opclassopts = NIL;
index->indexIncludingParams = lappend(index->indexIncludingParams, iparam);
}
/*
* If we found anything that requires run-time SET NOT NULL, build a full
* ALTER TABLE command for that and add it to cxt->alist.
*/
if (notnullcmds)
{
AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
alterstmt->relation = copyObject(cxt->relation);
alterstmt->cmds = notnullcmds;
alterstmt->objtype = OBJECT_TABLE;
alterstmt->missing_ok = false;
cxt->alist = lappend(cxt->alist, alterstmt);
}
return index;
}
/*
* transformExtendedStatistics
* Handle extended statistic objects
*
* Right now, there's nothing to do here, so we just append the list to
* the existing "after" list.
*/
static void
transformExtendedStatistics(CreateStmtContext *cxt)
{
cxt->alist = list_concat(cxt->alist, cxt->extstats);
}
/*
* transformCheckConstraints
* handle CHECK constraints
*
* Right now, there's nothing to do here when called from ALTER TABLE,
* but the other constraint-transformation functions are called in both
* the CREATE TABLE and ALTER TABLE paths, so do the same here, and just
* don't do anything if we're not authorized to skip validation.
*/
static void
transformCheckConstraints(CreateStmtContext *cxt, bool skipValidation)
{
ListCell *ckclist;
if (cxt->ckconstraints == NIL)
return;
/*
* If creating a new table (but not a foreign table), we can safely skip
* validation of check constraints, and nonetheless mark them valid. (This
* will override any user-supplied NOT VALID flag.)
*/
if (skipValidation)
{
foreach(ckclist, cxt->ckconstraints)
{
Constraint *constraint = (Constraint *) lfirst(ckclist);
constraint->skip_validation = true;
constraint->initially_valid = true;
}
}
}
/*
* transformFKConstraints
* handle FOREIGN KEY constraints
*/
static void
transformFKConstraints(CreateStmtContext *cxt,
bool skipValidation, bool isAddConstraint)
{
ListCell *fkclist;
if (cxt->fkconstraints == NIL)
return;
/*
* If CREATE TABLE or adding a column with NULL default, we can safely
* skip validation of FK constraints, and nonetheless mark them valid.
* (This will override any user-supplied NOT VALID flag.)
*/
if (skipValidation)
{
foreach(fkclist, cxt->fkconstraints)
{
Constraint *constraint = (Constraint *) lfirst(fkclist);
constraint->skip_validation = true;
constraint->initially_valid = true;
}
}
/*
* For CREATE TABLE or ALTER TABLE ADD COLUMN, gin up an ALTER TABLE ADD
* CONSTRAINT command to execute after the basic command is complete. (If
* called from ADD CONSTRAINT, that routine will add the FK constraints to
* its own subcommand list.)
*
* Note: the ADD CONSTRAINT command must also execute after any index
* creation commands. Thus, this should run after
* transformIndexConstraints, so that the CREATE INDEX commands are
* already in cxt->alist. See also the handling of cxt->likeclauses.
*/
if (!isAddConstraint)
{
AlterTableStmt *alterstmt = makeNode(AlterTableStmt);
alterstmt->relation = cxt->relation;
alterstmt->cmds = NIL;
alterstmt->objtype = OBJECT_TABLE;
foreach(fkclist, cxt->fkconstraints)
{
Constraint *constraint = (Constraint *) lfirst(fkclist);
AlterTableCmd *altercmd = makeNode(AlterTableCmd);
altercmd->subtype = AT_AddConstraint;
altercmd->name = NULL;
altercmd->def = (Node *) constraint;
alterstmt->cmds = lappend(alterstmt->cmds, altercmd);
}
cxt->alist = lappend(cxt->alist, alterstmt);
}
}
/*
* transformIndexStmt - parse analysis for CREATE INDEX and ALTER TABLE
*
* Note: this is a no-op for an index not using either index expressions or
* a predicate expression. There are several code paths that create indexes
* without bothering to call this, because they know they don't have any
* such expressions to deal with.
*
* To avoid race conditions, it's important that this function rely only on
* the passed-in relid (and not on stmt->relation) to determine the target
* relation.
*/
IndexStmt *
transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
return stmt;
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
/*
* Put the parent table into the rtable so that the expressions can refer
* to its fields without qualification. Caller is responsible for locking
* relation, but we still need to open it.
*/
rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
/* no to join list, yes to namespaces */
addNSItemToQuery(pstate, nsitem, false, true, true);
/* take care of the where clause */
if (stmt->whereClause)
{
stmt->whereClause = transformWhereClause(pstate,
stmt->whereClause,
EXPR_KIND_INDEX_PREDICATE,
"WHERE");
/* we have to fix its collations too */
assign_expr_collations(pstate, stmt->whereClause);
}
/* take care of any index expressions */
foreach(l, stmt->indexParams)
{
IndexElem *ielem = (IndexElem *) lfirst(l);
if (ielem->expr)
{
/* Extract preliminary index col name before transforming expr */
if (ielem->indexcolname == NULL)
ielem->indexcolname = FigureIndexColname(ielem->expr);
/* Now do parse transformation of the expression */
ielem->expr = transformExpr(pstate, ielem->expr,
EXPR_KIND_INDEX_EXPRESSION);
/* We have to fix its collations too */
assign_expr_collations(pstate, ielem->expr);
/*
* transformExpr() should have already rejected subqueries,
* aggregates, window functions, and SRFs, based on the EXPR_KIND_
* for an index expression.
*
* DefineIndex() will make more checks.
*/
}
}
/*
* Check that only the base rel is mentioned. (This should be dead code
* now that add_missing_from is history.)
*/
if (list_length(pstate->p_rtable) != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("index expressions and predicates can refer only to the table being indexed")));
free_parsestate(pstate);
/* Close relation */
table_close(rel, NoLock);
/* Mark statement as successfully transformed */
stmt->transformed = true;
return stmt;
}
/*
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
* the passed-in relid (and not on stmt->relation) to determine the target
* relation.
*/
CreateStatsStmt *
transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
return stmt;
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
/*
* Put the parent table into the rtable so that the expressions can refer
* to its fields without qualification. Caller is responsible for locking
* relation, but we still need to open it.
*/
rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
/* no to join list, yes to namespaces */
addNSItemToQuery(pstate, nsitem, false, true, true);
/* take care of any expressions */
foreach(l, stmt->exprs)
{
StatsElem *selem = (StatsElem *) lfirst(l);
if (selem->expr)
{
/* Now do parse transformation of the expression */
selem->expr = transformExpr(pstate, selem->expr,
EXPR_KIND_STATS_EXPRESSION);
/* We have to fix its collations too */
assign_expr_collations(pstate, selem->expr);
}
}
/*
* Check that only the base rel is mentioned. (This should be dead code
* now that add_missing_from is history.)
*/
if (list_length(pstate->p_rtable) != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("statistics expressions can refer only to the table being referenced")));
free_parsestate(pstate);
/* Close relation */
table_close(rel, NoLock);
/* Mark statement as successfully transformed */
stmt->transformed = true;
return stmt;
}
/*
* transformRuleStmt -
* transform a CREATE RULE Statement. The action is a list of parse
* trees which is transformed into a list of query trees, and we also
* transform the WHERE clause if any.
*
* actions and whereClause are output parameters that receive the
* transformed results.
*/
void
transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause)
{
Relation rel;
ParseState *pstate;
ParseNamespaceItem *oldnsitem;
ParseNamespaceItem *newnsitem;
/*
* To avoid deadlock, make sure the first thing we do is grab
* AccessExclusiveLock on the target relation. This will be needed by
* DefineQueryRewrite(), and we don't want to grab a lesser lock
* beforehand.
*/
rel = table_openrv(stmt->relation, AccessExclusiveLock);
if (rel->rd_rel->relkind == RELKIND_MATVIEW)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("rules on materialized views are not supported")));
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
/*
* NOTE: 'OLD' must always have a varno equal to 1 and 'NEW' equal to 2.
* Set up their ParseNamespaceItems in the main pstate for use in parsing
* the rule qualification.
*/
oldnsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
makeAlias("old", NIL),
false, false);
newnsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
makeAlias("new", NIL),
false, false);
/*
* They must be in the namespace too for lookup purposes, but only add the
* one(s) that are relevant for the current kind of rule. In an UPDATE
* rule, quals must refer to OLD.field or NEW.field to be unambiguous, but
* there's no need to be so picky for INSERT & DELETE. We do not add them
* to the joinlist.
*/
switch (stmt->event)
{
case CMD_SELECT:
addNSItemToQuery(pstate, oldnsitem, false, true, true);
break;
case CMD_UPDATE:
addNSItemToQuery(pstate, oldnsitem, false, true, true);
addNSItemToQuery(pstate, newnsitem, false, true, true);
break;
case CMD_INSERT:
addNSItemToQuery(pstate, newnsitem, false, true, true);
break;
case CMD_DELETE:
addNSItemToQuery(pstate, oldnsitem, false, true, true);
break;
default:
elog(ERROR, "unrecognized event type: %d",
(int) stmt->event);
break;
}
/* take care of the where clause */
*whereClause = transformWhereClause(pstate,
stmt->whereClause,
EXPR_KIND_WHERE,
"WHERE");
/* we have to fix its collations too */
assign_expr_collations(pstate, *whereClause);
/* this is probably dead code without add_missing_from: */
if (list_length(pstate->p_rtable) != 2) /* naughty, naughty... */
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("rule WHERE condition cannot contain references to other relations")));
/*
* 'instead nothing' rules with a qualification need a query rangetable so
* the rewrite handler can add the negated rule qualification to the
* original query. We create a query with the new command type CMD_NOTHING
* here that is treated specially by the rewrite system.
*/
if (stmt->actions == NIL)
{
Query *nothing_qry = makeNode(Query);
nothing_qry->commandType = CMD_NOTHING;
nothing_qry->rtable = pstate->p_rtable;
nothing_qry->rteperminfos = pstate->p_rteperminfos;
nothing_qry->jointree = makeFromExpr(NIL, NULL); /* no join wanted */
*actions = list_make1(nothing_qry);
}
else
{
ListCell *l;
List *newactions = NIL;
/*
* transform each statement, like parse_sub_analyze()
*/
foreach(l, stmt->actions)
{
Node *action = (Node *) lfirst(l);
ParseState *sub_pstate = make_parsestate(NULL);
Query *sub_qry,
*top_subqry;
bool has_old,
has_new;
/*
* Since outer ParseState isn't parent of inner, have to pass down
* the query text by hand.
*/
sub_pstate->p_sourcetext = queryString;
/*
* Set up OLD/NEW in the rtable for this statement. The entries
* are added only to relnamespace, not varnamespace, because we
* don't want them to be referred to by unqualified field names
* nor "*" in the rule actions. We decide later whether to put
* them in the joinlist.
*/
oldnsitem = addRangeTableEntryForRelation(sub_pstate, rel,
AccessShareLock,
makeAlias("old", NIL),
false, false);
newnsitem = addRangeTableEntryForRelation(sub_pstate, rel,
AccessShareLock,
makeAlias("new", NIL),
false, false);
addNSItemToQuery(sub_pstate, oldnsitem, false, true, false);
addNSItemToQuery(sub_pstate, newnsitem, false, true, false);
/* Transform the rule action statement */
top_subqry = transformStmt(sub_pstate, action);
/*
* We cannot support utility-statement actions (eg NOTIFY) with
* nonempty rule WHERE conditions, because there's no way to make
* the utility action execute conditionally.
*/
if (top_subqry->commandType == CMD_UTILITY &&
*whereClause != NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("rules with WHERE conditions can only have SELECT, INSERT, UPDATE, or DELETE actions")));
/*
* If the action is INSERT...SELECT, OLD/NEW have been pushed down
* into the SELECT, and that's what we need to look at. (Ugly
* kluge ... try to fix this when we redesign querytrees.)
*/
sub_qry = getInsertSelectQuery(top_subqry, NULL);
/*
* If the sub_qry is a setop, we cannot attach any qualifications
* to it, because the planner won't notice them. This could
* perhaps be relaxed someday, but for now, we may as well reject
* such a rule immediately.
*/
if (sub_qry->setOperations != NULL && *whereClause != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
/*
* Validate action's use of OLD/NEW, qual too
*/
has_old =
rangeTableEntry_used((Node *) sub_qry, PRS2_OLD_VARNO, 0) ||
rangeTableEntry_used(*whereClause, PRS2_OLD_VARNO, 0);
has_new =
rangeTableEntry_used((Node *) sub_qry, PRS2_NEW_VARNO, 0) ||
rangeTableEntry_used(*whereClause, PRS2_NEW_VARNO, 0);
switch (stmt->event)
{
case CMD_SELECT:
if (has_old)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("ON SELECT rule cannot use OLD")));
if (has_new)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("ON SELECT rule cannot use NEW")));
break;
case CMD_UPDATE:
/* both are OK */
break;
case CMD_INSERT:
if (has_old)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("ON INSERT rule cannot use OLD")));
break;
case CMD_DELETE:
if (has_new)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("ON DELETE rule cannot use NEW")));
break;
default:
elog(ERROR, "unrecognized event type: %d",
(int) stmt->event);
break;
}
/*
* OLD/NEW are not allowed in WITH queries, because they would
* amount to outer references for the WITH, which we disallow.
* However, they were already in the outer rangetable when we
* analyzed the query, so we have to check.
*
* Note that in the INSERT...SELECT case, we need to examine the
* CTE lists of both top_subqry and sub_qry.
*
* Note that we aren't digging into the body of the query looking
* for WITHs in nested sub-SELECTs. A WITH down there can
* legitimately refer to OLD/NEW, because it'd be an
* indirect-correlated outer reference.
*/
if (rangeTableEntry_used((Node *) top_subqry->cteList,
PRS2_OLD_VARNO, 0) ||
rangeTableEntry_used((Node *) sub_qry->cteList,
PRS2_OLD_VARNO, 0))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot refer to OLD within WITH query")));
if (rangeTableEntry_used((Node *) top_subqry->cteList,
PRS2_NEW_VARNO, 0) ||
rangeTableEntry_used((Node *) sub_qry->cteList,
PRS2_NEW_VARNO, 0))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot refer to NEW within WITH query")));
/*
* For efficiency's sake, add OLD to the rule action's jointree
* only if it was actually referenced in the statement or qual.
*
* For INSERT, NEW is not really a relation (only a reference to
* the to-be-inserted tuple) and should never be added to the
* jointree.
*
* For UPDATE, we treat NEW as being another kind of reference to
* OLD, because it represents references to *transformed* tuples
* of the existing relation. It would be wrong to enter NEW
* separately in the jointree, since that would cause a double
* join of the updated relation. It's also wrong to fail to make
* a jointree entry if only NEW and not OLD is mentioned.
*/
if (has_old || (has_new && stmt->event == CMD_UPDATE))
{
RangeTblRef *rtr;
/*
* If sub_qry is a setop, manipulating its jointree will do no
* good at all, because the jointree is dummy. (This should be
* a can't-happen case because of prior tests.)
*/
if (sub_qry->setOperations != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
/* hackishly add OLD to the already-built FROM clause */
rtr = makeNode(RangeTblRef);
rtr->rtindex = oldnsitem->p_rtindex;
sub_qry->jointree->fromlist =
lappend(sub_qry->jointree->fromlist, rtr);
}
newactions = lappend(newactions, top_subqry);
free_parsestate(sub_pstate);
}
*actions = newactions;
}
free_parsestate(pstate);
/* Close relation, but keep the exclusive lock */
table_close(rel, NoLock);
}
/*
* transformAlterTableStmt -
* parse analysis for ALTER TABLE
*
* Returns the transformed AlterTableStmt. There may be additional actions
* to be done before and after the transformed statement, which are returned
* in *beforeStmts and *afterStmts as lists of utility command parsetrees.
*
* To avoid race conditions, it's important that this function rely only on
* the passed-in relid (and not on stmt->relation) to determine the target
* relation.
*/
AlterTableStmt *
transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
const char *queryString,
List **beforeStmts, List **afterStmts)
{
Relation rel;
TupleDesc tupdesc;
ParseState *pstate;
CreateStmtContext cxt;
List *save_alist;
ListCell *lcmd,
*l;
List *newcmds = NIL;
bool skipValidation = true;
AlterTableCmd *newcmd;
ParseNamespaceItem *nsitem;
/* Caller is responsible for locking the relation */
rel = relation_open(relid, NoLock);
tupdesc = RelationGetDescr(rel);
/* Set up pstate */
pstate = make_parsestate(NULL);
pstate->p_sourcetext = queryString;
nsitem = addRangeTableEntryForRelation(pstate,
rel,
AccessShareLock,
NULL,
false,
true);
addNSItemToQuery(pstate, nsitem, false, true, true);
/* Set up CreateStmtContext */
cxt.pstate = pstate;
if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
{
cxt.stmtType = "ALTER FOREIGN TABLE";
cxt.isforeign = true;
}
else
{
cxt.stmtType = "ALTER TABLE";
cxt.isforeign = false;
}
cxt.relation = stmt->relation;
cxt.rel = rel;
cxt.inhRelations = NIL;
cxt.isalter = true;
cxt.columns = NIL;
cxt.ckconstraints = NIL;
cxt.nnconstraints = NIL;
cxt.fkconstraints = NIL;
cxt.ixconstraints = NIL;
cxt.likeclauses = NIL;
cxt.extstats = NIL;
cxt.blist = NIL;
cxt.alist = NIL;
cxt.pkey = NULL;
cxt.ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
cxt.partbound = NULL;
cxt.ofType = false;
/*
* Transform ALTER subcommands that need it (most don't). These largely
* re-use code from CREATE TABLE.
*/
foreach(lcmd, stmt->cmds)
{
AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
switch (cmd->subtype)
{
case AT_AddColumn:
{
ColumnDef *def = castNode(ColumnDef, cmd->def);
transformColumnDefinition(&cxt, def);
/*
* If the column has a non-null default, we can't skip
* validation of foreign keys.
*/
if (def->raw_default != NULL)
skipValidation = false;
/*
* All constraints are processed in other ways. Remove the
* original list
*/
def->constraints = NIL;
newcmds = lappend(newcmds, cmd);
break;
}
case AT_AddConstraint:
/*
* The original AddConstraint cmd node doesn't go to newcmds
*/
if (IsA(cmd->def, Constraint))
{
transformTableConstraint(&cxt, (Constraint *) cmd->def);
if (((Constraint *) cmd->def)->contype == CONSTR_FOREIGN)
skipValidation = false;
}
else
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(cmd->def));
break;
case AT_AlterColumnType:
{
ColumnDef *def = castNode(ColumnDef, cmd->def);
AttrNumber attnum;
/*
* For ALTER COLUMN TYPE, transform the USING clause if
* one was specified.
*/
if (def->raw_default)
{
def->cooked_default =
transformExpr(pstate, def->raw_default,
EXPR_KIND_ALTER_COL_TRANSFORM);
}
/*
* For identity column, create ALTER SEQUENCE command to
* change the data type of the sequence.
*/
attnum = get_attnum(relid, cmd->name);
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
cmd->name, RelationGetRelationName(rel))));
if (attnum > 0 &&
TupleDescAttr(tupdesc, attnum - 1)->attidentity)
{
Oid seq_relid = getIdentitySequence(relid, attnum, false);
Oid typeOid = typenameTypeId(pstate, def->typeName);
AlterSeqStmt *altseqstmt = makeNode(AlterSeqStmt);
altseqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
get_rel_name(seq_relid),
-1);
altseqstmt->options = list_make1(makeDefElem("as", (Node *) makeTypeNameFromOid(typeOid, -1), -1));
altseqstmt->for_identity = true;
cxt.blist = lappend(cxt.blist, altseqstmt);
}
newcmds = lappend(newcmds, cmd);
break;
}
case AT_AddIdentity:
{
Constraint *def = castNode(Constraint, cmd->def);
ColumnDef *newdef = makeNode(ColumnDef);
AttrNumber attnum;
newdef->colname = cmd->name;
newdef->identity = def->generated_when;
cmd->def = (Node *) newdef;
attnum = get_attnum(relid, cmd->name);
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
cmd->name, RelationGetRelationName(rel))));
generateSerialExtraStmts(&cxt, newdef,
get_atttype(relid, attnum),
def->options, true, true,
NULL, NULL);
newcmds = lappend(newcmds, cmd);
break;
}
case AT_SetIdentity:
{
/*
* Create an ALTER SEQUENCE statement for the internal
* sequence of the identity column.
*/
ListCell *lc;
List *newseqopts = NIL;
List *newdef = NIL;
AttrNumber attnum;
Oid seq_relid;
/*
* Split options into those handled by ALTER SEQUENCE and
* those for ALTER TABLE proper.
*/
foreach(lc, castNode(List, cmd->def))
{
DefElem *def = lfirst_node(DefElem, lc);
if (strcmp(def->defname, "generated") == 0)
newdef = lappend(newdef, def);
else
newseqopts = lappend(newseqopts, def);
}
attnum = get_attnum(relid, cmd->name);
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
cmd->name, RelationGetRelationName(rel))));
seq_relid = getIdentitySequence(relid, attnum, true);
if (seq_relid)
{
AlterSeqStmt *seqstmt;
seqstmt = makeNode(AlterSeqStmt);
seqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
get_rel_name(seq_relid), -1);
seqstmt->options = newseqopts;
seqstmt->for_identity = true;
seqstmt->missing_ok = false;
cxt.blist = lappend(cxt.blist, seqstmt);
}
/*
* If column was not an identity column, we just let the
* ALTER TABLE command error out later. (There are cases
* this fails to cover, but we'll need to restructure
* where creation of the sequence dependency linkage
* happens before we can fix it.)
*/
cmd->def = (Node *) newdef;
newcmds = lappend(newcmds, cmd);
break;
}
case AT_AttachPartition:
case AT_DetachPartition:
{
PartitionCmd *partcmd = (PartitionCmd *) cmd->def;
transformPartitionCmd(&cxt, partcmd);
/* assign transformed value of the partition bound */
partcmd->bound = cxt.partbound;
}
newcmds = lappend(newcmds, cmd);
break;
default:
/*
* Currently, we shouldn't actually get here for subcommand
* types that don't require transformation; but if we do, just
* emit them unchanged.
*/
newcmds = lappend(newcmds, cmd);
break;
}
}
/*
* Transfer anything we already have in cxt.alist into save_alist, to keep
* it separate from the output of transformIndexConstraints.
*/
save_alist = cxt.alist;
cxt.alist = NIL;
/* Postprocess constraints */
transformIndexConstraints(&cxt);
transformFKConstraints(&cxt, skipValidation, true);
transformCheckConstraints(&cxt, false);
/*
* Push any index-creation commands into the ALTER, so that they can be
* scheduled nicely by tablecmds.c. Note that tablecmds.c assumes that
* the IndexStmt attached to an AT_AddIndex or AT_AddIndexConstraint
* subcommand has already been through transformIndexStmt.
*/
foreach(l, cxt.alist)
{
Node *istmt = (Node *) lfirst(l);
/*
* We assume here that cxt.alist contains only IndexStmts and possibly
* AT_SetAttNotNull statements generated from primary key constraints.
* We absorb the subcommands of the latter directly.
*/
if (IsA(istmt, IndexStmt))
{
IndexStmt *idxstmt = (IndexStmt *) istmt;
idxstmt = transformIndexStmt(relid, idxstmt, queryString);
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = OidIsValid(idxstmt->indexOid) ? AT_AddIndexConstraint : AT_AddIndex;
newcmd->def = (Node *) idxstmt;
newcmds = lappend(newcmds, newcmd);
}
else if (IsA(istmt, AlterTableStmt))
{
AlterTableStmt *alterstmt = (AlterTableStmt *) istmt;
newcmds = list_concat(newcmds, alterstmt->cmds);
}
else
elog(ERROR, "unexpected stmt type %d", (int) nodeTag(istmt));
}
cxt.alist = NIL;
/* Append any CHECK, NOT NULL or FK constraints to the commands list */
foreach(l, cxt.ckconstraints)
{
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_AddConstraint;
newcmd->def = (Node *) lfirst_node(Constraint, l);
newcmds = lappend(newcmds, newcmd);
}
foreach(l, cxt.nnconstraints)
{
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_AddConstraint;
newcmd->def = (Node *) lfirst_node(Constraint, l);
newcmds = lappend(newcmds, newcmd);
}
foreach(l, cxt.fkconstraints)
{
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_AddConstraint;
newcmd->def = (Node *) lfirst_node(Constraint, l);
newcmds = lappend(newcmds, newcmd);
}
/* Append extended statistics objects */
transformExtendedStatistics(&cxt);
/* Close rel */
relation_close(rel, NoLock);
/*
* Output results.
*/
stmt->cmds = newcmds;
*beforeStmts = cxt.blist;
*afterStmts = list_concat(cxt.alist, save_alist);
return stmt;
}
/*
* Preprocess a list of column constraint clauses
* to attach constraint attributes to their primary constraint nodes
* and detect inconsistent/misplaced constraint attributes.
*
* NOTE: currently, attributes are only supported for FOREIGN KEY, UNIQUE,
* EXCLUSION, and PRIMARY KEY constraints, but someday they ought to be
* supported for other constraint types.
*/
static void
transformConstraintAttrs(CreateStmtContext *cxt, List *constraintList)
{
Constraint *lastprimarycon = NULL;
bool saw_deferrability = false;
bool saw_initially = false;
ListCell *clist;
#define SUPPORTS_ATTRS(node) \
((node) != NULL && \
((node)->contype == CONSTR_PRIMARY || \
(node)->contype == CONSTR_UNIQUE || \
(node)->contype == CONSTR_EXCLUSION || \
(node)->contype == CONSTR_FOREIGN))
foreach(clist, constraintList)
{
Constraint *con = (Constraint *) lfirst(clist);
if (!IsA(con, Constraint))
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(con));
switch (con->contype)
{
case CONSTR_ATTR_DEFERRABLE:
if (!SUPPORTS_ATTRS(lastprimarycon))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("misplaced DEFERRABLE clause"),
parser_errposition(cxt->pstate, con->location)));
if (saw_deferrability)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
parser_errposition(cxt->pstate, con->location)));
saw_deferrability = true;
lastprimarycon->deferrable = true;
break;
case CONSTR_ATTR_NOT_DEFERRABLE:
if (!SUPPORTS_ATTRS(lastprimarycon))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("misplaced NOT DEFERRABLE clause"),
parser_errposition(cxt->pstate, con->location)));
if (saw_deferrability)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple DEFERRABLE/NOT DEFERRABLE clauses not allowed"),
parser_errposition(cxt->pstate, con->location)));
saw_deferrability = true;
lastprimarycon->deferrable = false;
if (saw_initially &&
lastprimarycon->initdeferred)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
parser_errposition(cxt->pstate, con->location)));
break;
case CONSTR_ATTR_DEFERRED:
if (!SUPPORTS_ATTRS(lastprimarycon))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("misplaced INITIALLY DEFERRED clause"),
parser_errposition(cxt->pstate, con->location)));
if (saw_initially)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
parser_errposition(cxt->pstate, con->location)));
saw_initially = true;
lastprimarycon->initdeferred = true;
/*
* If only INITIALLY DEFERRED appears, assume DEFERRABLE
*/
if (!saw_deferrability)
lastprimarycon->deferrable = true;
else if (!lastprimarycon->deferrable)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("constraint declared INITIALLY DEFERRED must be DEFERRABLE"),
parser_errposition(cxt->pstate, con->location)));
break;
case CONSTR_ATTR_IMMEDIATE:
if (!SUPPORTS_ATTRS(lastprimarycon))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("misplaced INITIALLY IMMEDIATE clause"),
parser_errposition(cxt->pstate, con->location)));
if (saw_initially)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("multiple INITIALLY IMMEDIATE/DEFERRED clauses not allowed"),
parser_errposition(cxt->pstate, con->location)));
saw_initially = true;
lastprimarycon->initdeferred = false;
break;
default:
/* Otherwise it's not an attribute */
lastprimarycon = con;
/* reset flags for new primary node */
saw_deferrability = false;
saw_initially = false;
break;
}
}
}
/*
* Special handling of type definition for a column
*/
static void
transformColumnType(CreateStmtContext *cxt, ColumnDef *column)
{
/*
* All we really need to do here is verify that the type is valid,
* including any collation spec that might be present.
*/
Type ctype = typenameType(cxt->pstate, column->typeName, NULL);
if (column->collClause)
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(ctype);
LookupCollation(cxt->pstate,
column->collClause->collname,
column->collClause->location);
/* Complain if COLLATE is applied to an uncollatable type */
if (!OidIsValid(typtup->typcollation))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("collations are not supported by type %s",
format_type_be(typtup->oid)),
parser_errposition(cxt->pstate,
column->collClause->location)));
}
ReleaseSysCache(ctype);
}
/*
* transformCreateSchemaStmtElements -
* analyzes the elements of a CREATE SCHEMA statement
*
* Split the schema element list from a CREATE SCHEMA statement into
* individual commands and place them in the result list in an order
* such that there are no forward references (e.g. GRANT to a table
* created later in the list). Note that the logic we use for determining
* forward references is presently quite incomplete.
*
* "schemaName" is the name of the schema that will be used for the creation
* of the objects listed, that may be compiled from the schema name defined
* in the statement or a role specification.
*
* SQL also allows constraints to make forward references, so thumb through
* the table columns and move forward references to a posterior alter-table
* command.
*
* The result is a list of parse nodes that still need to be analyzed ---
* but we can't analyze the later commands until we've executed the earlier
* ones, because of possible inter-object references.
*
* Note: this breaks the rules a little bit by modifying schema-name fields
* within passed-in structs. However, the transformation would be the same
* if done over, so it should be all right to scribble on the input to this
* extent.
*/
List *
transformCreateSchemaStmtElements(List *schemaElts, const char *schemaName)
{
CreateSchemaStmtContext cxt;
List *result;
ListCell *elements;
cxt.schemaname = schemaName;
cxt.sequences = NIL;
cxt.tables = NIL;
cxt.views = NIL;
cxt.indexes = NIL;
cxt.triggers = NIL;
cxt.grants = NIL;
/*
* Run through each schema element in the schema element list. Separate
* statements by type, and do preliminary analysis.
*/
foreach(elements, schemaElts)
{
Node *element = lfirst(elements);
switch (nodeTag(element))
{
case T_CreateSeqStmt:
{
CreateSeqStmt *elp = (CreateSeqStmt *) element;
setSchemaName(cxt.schemaname, &elp->sequence->schemaname);
cxt.sequences = lappend(cxt.sequences, element);
}
break;
case T_CreateStmt:
{
CreateStmt *elp = (CreateStmt *) element;
setSchemaName(cxt.schemaname, &elp->relation->schemaname);
/*
* XXX todo: deal with constraints
*/
cxt.tables = lappend(cxt.tables, element);
}
break;
case T_ViewStmt:
{
ViewStmt *elp = (ViewStmt *) element;
setSchemaName(cxt.schemaname, &elp->view->schemaname);
/*
* XXX todo: deal with references between views
*/
cxt.views = lappend(cxt.views, element);
}
break;
case T_IndexStmt:
{
IndexStmt *elp = (IndexStmt *) element;
setSchemaName(cxt.schemaname, &elp->relation->schemaname);
cxt.indexes = lappend(cxt.indexes, element);
}
break;
case T_CreateTrigStmt:
{
CreateTrigStmt *elp = (CreateTrigStmt *) element;
setSchemaName(cxt.schemaname, &elp->relation->schemaname);
cxt.triggers = lappend(cxt.triggers, element);
}
break;
case T_GrantStmt:
cxt.grants = lappend(cxt.grants, element);
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(element));
}
}
result = NIL;
result = list_concat(result, cxt.sequences);
result = list_concat(result, cxt.tables);
result = list_concat(result, cxt.views);
result = list_concat(result, cxt.indexes);
result = list_concat(result, cxt.triggers);
result = list_concat(result, cxt.grants);
return result;
}
/*
* setSchemaName
* Set or check schema name in an element of a CREATE SCHEMA command
*/
static void
setSchemaName(const char *context_schema, char **stmt_schema_name)
{
if (*stmt_schema_name == NULL)
*stmt_schema_name = unconstify(char *, context_schema);
else if (strcmp(context_schema, *stmt_schema_name) != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_SCHEMA_DEFINITION),
errmsg("CREATE specifies a schema (%s) "
"different from the one being created (%s)",
*stmt_schema_name, context_schema)));
}
/*
* transformPartitionCmd
* Analyze the ATTACH/DETACH PARTITION command
*
* In case of the ATTACH PARTITION command, cxt->partbound is set to the
* transformed value of cmd->bound.
*/
static void
transformPartitionCmd(CreateStmtContext *cxt, PartitionCmd *cmd)
{
Relation parentRel = cxt->rel;
switch (parentRel->rd_rel->relkind)
{
case RELKIND_PARTITIONED_TABLE:
/* transform the partition bound, if any */
Assert(RelationGetPartitionKey(parentRel) != NULL);
if (cmd->bound != NULL)
cxt->partbound = transformPartitionBound(cxt->pstate, parentRel,
cmd->bound);
break;
case RELKIND_PARTITIONED_INDEX:
/*
* A partitioned index cannot have a partition bound set. ALTER
* INDEX prevents that with its grammar, but not ALTER TABLE.
*/
if (cmd->bound != NULL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("\"%s\" is not a partitioned table",
RelationGetRelationName(parentRel))));
break;
case RELKIND_RELATION:
/* the table must be partitioned */
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("table \"%s\" is not partitioned",
RelationGetRelationName(parentRel))));
break;
case RELKIND_INDEX:
/* the index must be partitioned */
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("index \"%s\" is not partitioned",
RelationGetRelationName(parentRel))));
break;
default:
/* parser shouldn't let this case through */
elog(ERROR, "\"%s\" is not a partitioned table or index",
RelationGetRelationName(parentRel));
break;
}
}
/*
* transformPartitionBound
*
* Transform a partition bound specification
*/
PartitionBoundSpec *
transformPartitionBound(ParseState *pstate, Relation parent,
PartitionBoundSpec *spec)
{
PartitionBoundSpec *result_spec;
PartitionKey key = RelationGetPartitionKey(parent);
char strategy = get_partition_strategy(key);
int partnatts = get_partition_natts(key);
List *partexprs = get_partition_exprs(key);
/* Avoid scribbling on input */
result_spec = copyObject(spec);
if (spec->is_default)
{
/*
* Hash partitioning does not support a default partition; there's no
* use case for it (since the set of partitions to create is perfectly
* defined), and if users do get into it accidentally, it's hard to
* back out from it afterwards.
*/
if (strategy == PARTITION_STRATEGY_HASH)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("a hash-partitioned table may not have a default partition")));
/*
* In case of the default partition, parser had no way to identify the
* partition strategy. Assign the parent's strategy to the default
* partition bound spec.
*/
result_spec->strategy = strategy;
return result_spec;
}
if (strategy == PARTITION_STRATEGY_HASH)
{
if (spec->strategy != PARTITION_STRATEGY_HASH)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("invalid bound specification for a hash partition"),
parser_errposition(pstate, exprLocation((Node *) spec))));
if (spec->modulus <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("modulus for hash partition must be an integer value greater than zero")));
Assert(spec->remainder >= 0);
if (spec->remainder >= spec->modulus)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("remainder for hash partition must be less than modulus")));
}
else if (strategy == PARTITION_STRATEGY_LIST)
{
ListCell *cell;
char *colname;
Oid coltype;
int32 coltypmod;
Oid partcollation;
if (spec->strategy != PARTITION_STRATEGY_LIST)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("invalid bound specification for a list partition"),
parser_errposition(pstate, exprLocation((Node *) spec))));
/* Get the only column's name in case we need to output an error */
if (key->partattrs[0] != 0)
colname = get_attname(RelationGetRelid(parent),
key->partattrs[0], false);
else
colname = deparse_expression((Node *) linitial(partexprs),
deparse_context_for(RelationGetRelationName(parent),
RelationGetRelid(parent)),
false, false);
/* Need its type data too */
coltype = get_partition_col_typid(key, 0);
coltypmod = get_partition_col_typmod(key, 0);
partcollation = get_partition_col_collation(key, 0);
result_spec->listdatums = NIL;
foreach(cell, spec->listdatums)
{
Node *expr = lfirst(cell);
Const *value;
ListCell *cell2;
bool duplicate;
value = transformPartitionBoundValue(pstate, expr,
colname, coltype, coltypmod,
partcollation);
/* Don't add to the result if the value is a duplicate */
duplicate = false;
foreach(cell2, result_spec->listdatums)
{
Const *value2 = lfirst_node(Const, cell2);
if (equal(value, value2))
{
duplicate = true;
break;
}
}
if (duplicate)
continue;
result_spec->listdatums = lappend(result_spec->listdatums,
value);
}
}
else if (strategy == PARTITION_STRATEGY_RANGE)
{
if (spec->strategy != PARTITION_STRATEGY_RANGE)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("invalid bound specification for a range partition"),
parser_errposition(pstate, exprLocation((Node *) spec))));
if (list_length(spec->lowerdatums) != partnatts)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("FROM must specify exactly one value per partitioning column")));
if (list_length(spec->upperdatums) != partnatts)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("TO must specify exactly one value per partitioning column")));
/*
* Convert raw parse nodes into PartitionRangeDatum nodes and perform
* any necessary validation.
*/
result_spec->lowerdatums =
transformPartitionRangeBounds(pstate, spec->lowerdatums,
parent);
result_spec->upperdatums =
transformPartitionRangeBounds(pstate, spec->upperdatums,
parent);
}
else
elog(ERROR, "unexpected partition strategy: %d", (int) strategy);
return result_spec;
}
/*
* transformPartitionRangeBounds
* This converts the expressions for range partition bounds from the raw
* grammar representation to PartitionRangeDatum structs
*/
static List *
transformPartitionRangeBounds(ParseState *pstate, List *blist,
Relation parent)
{
List *result = NIL;
PartitionKey key = RelationGetPartitionKey(parent);
List *partexprs = get_partition_exprs(key);
ListCell *lc;
int i,
j;
i = j = 0;
foreach(lc, blist)
{
Node *expr = lfirst(lc);
PartitionRangeDatum *prd = NULL;
/*
* Infinite range bounds -- "minvalue" and "maxvalue" -- get passed in
* as ColumnRefs.
*/
if (IsA(expr, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) expr;
char *cname = NULL;
/*
* There should be a single field named either "minvalue" or
* "maxvalue".
*/
if (list_length(cref->fields) == 1 &&
IsA(linitial(cref->fields), String))
cname = strVal(linitial(cref->fields));
if (cname == NULL)
{
/*
* ColumnRef is not in the desired single-field-name form. For
* consistency between all partition strategies, let the
* expression transformation report any errors rather than
* doing it ourselves.
*/
}
else if (strcmp("minvalue", cname) == 0)
{
prd = makeNode(PartitionRangeDatum);
prd->kind = PARTITION_RANGE_DATUM_MINVALUE;
prd->value = NULL;
}
else if (strcmp("maxvalue", cname) == 0)
{
prd = makeNode(PartitionRangeDatum);
prd->kind = PARTITION_RANGE_DATUM_MAXVALUE;
prd->value = NULL;
}
}
if (prd == NULL)
{
char *colname;
Oid coltype;
int32 coltypmod;
Oid partcollation;
Const *value;
/* Get the column's name in case we need to output an error */
if (key->partattrs[i] != 0)
colname = get_attname(RelationGetRelid(parent),
key->partattrs[i], false);
else
{
colname = deparse_expression((Node *) list_nth(partexprs, j),
deparse_context_for(RelationGetRelationName(parent),
RelationGetRelid(parent)),
false, false);
++j;
}
/* Need its type data too */
coltype = get_partition_col_typid(key, i);
coltypmod = get_partition_col_typmod(key, i);
partcollation = get_partition_col_collation(key, i);
value = transformPartitionBoundValue(pstate, expr,
colname,
coltype, coltypmod,
partcollation);
if (value->constisnull)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("cannot specify NULL in range bound")));
prd = makeNode(PartitionRangeDatum);
prd->kind = PARTITION_RANGE_DATUM_VALUE;
prd->value = (Node *) value;
++i;
}
prd->location = exprLocation(expr);
result = lappend(result, prd);
}
/*
* Once we see MINVALUE or MAXVALUE for one column, the remaining columns
* must be the same.
*/
validateInfiniteBounds(pstate, result);
return result;
}
/*
* validateInfiniteBounds
*
* Check that a MAXVALUE or MINVALUE specification in a partition bound is
* followed only by more of the same.
*/
static void
validateInfiniteBounds(ParseState *pstate, List *blist)
{
ListCell *lc;
PartitionRangeDatumKind kind = PARTITION_RANGE_DATUM_VALUE;
foreach(lc, blist)
{
PartitionRangeDatum *prd = lfirst_node(PartitionRangeDatum, lc);
if (kind == prd->kind)
continue;
switch (kind)
{
case PARTITION_RANGE_DATUM_VALUE:
kind = prd->kind;
break;
case PARTITION_RANGE_DATUM_MAXVALUE:
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("every bound following MAXVALUE must also be MAXVALUE"),
parser_errposition(pstate, exprLocation((Node *) prd))));
break;
case PARTITION_RANGE_DATUM_MINVALUE:
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("every bound following MINVALUE must also be MINVALUE"),
parser_errposition(pstate, exprLocation((Node *) prd))));
break;
}
}
}
/*
* Transform one entry in a partition bound spec, producing a constant.
*/
static Const *
transformPartitionBoundValue(ParseState *pstate, Node *val,
const char *colName, Oid colType, int32 colTypmod,
Oid partCollation)
{
Node *value;
/* Transform raw parsetree */
value = transformExpr(pstate, val, EXPR_KIND_PARTITION_BOUND);
/*
* transformExpr() should have already rejected column references,
* subqueries, aggregates, window functions, and SRFs, based on the
* EXPR_KIND_ of a partition bound expression.
*/
Assert(!contain_var_clause(value));
/*
* Coerce to the correct type. This might cause an explicit coercion step
* to be added on top of the expression, which must be evaluated before
* returning the result to the caller.
*/
value = coerce_to_target_type(pstate,
value, exprType(value),
colType,
colTypmod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST,
-1);
if (value == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("specified value cannot be cast to type %s for column \"%s\"",
format_type_be(colType), colName),
parser_errposition(pstate, exprLocation(val))));
/*
* Evaluate the expression, if needed, assigning the partition key's data
* type and collation to the resulting Const node.
*/
if (!IsA(value, Const))
{
assign_expr_collations(pstate, value);
value = (Node *) expression_planner((Expr *) value);
value = (Node *) evaluate_expr((Expr *) value, colType, colTypmod,
partCollation);
if (!IsA(value, Const))
elog(ERROR, "could not evaluate partition bound expression");
}
else
{
/*
* If the expression is already a Const, as is often the case, we can
* skip the rather expensive steps above. But we still have to insert
* the right collation, since coerce_to_target_type doesn't handle
* that.
*/
((Const *) value)->constcollid = partCollation;
}
/*
* Attach original expression's parse location to the Const, so that
* that's what will be reported for any later errors related to this
* partition bound.
*/
((Const *) value)->location = exprLocation(val);
return (Const *) value;
}
View Git Blame Copy Permalink