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Implement IMPORT FOREIGN SCHEMA.

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This command provides an automated way to create foreign table definitions
that match remote tables, thereby reducing tedium and chances for error.
In this patch, we provide the necessary core-server infrastructure and
implement the feature fully in the postgres_fdw foreign-data wrapper.
Other wrappers will throw a "feature not supported" error until/unless
they are updated.

Ronan Dunklau and Michael Paquier, additional work by me
This commit is contained in:
Tom Lane
2014-07-10 15:01:31 -04:00
parent 6a605cd6bd
commit 59efda3e50
29 changed files with 1239 additions and 15 deletions
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64
src/backend/parser/gram.y
View File

@ -111,6 +111,13 @@ typedef struct PrivTarget
List *objs;
} PrivTarget;
/* Private struct for the result of import_qualification production */
typedef struct ImportQual
{
ImportForeignSchemaType type;
List *table_names;
} ImportQual;
/* ConstraintAttributeSpec yields an integer bitmask of these flags: */
#define CAS_NOT_DEFERRABLE 0x01
#define CAS_DEFERRABLE 0x02
@ -212,6 +219,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
ResTarget *target;
struct PrivTarget *privtarget;
AccessPriv *accesspriv;
struct ImportQual *importqual;
InsertStmt *istmt;
VariableSetStmt *vsetstmt;
}
@ -238,8 +246,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
DropAssertStmt DropTrigStmt DropRuleStmt DropCastStmt DropRoleStmt
DropUserStmt DropdbStmt DropTableSpaceStmt DropFdwStmt
DropForeignServerStmt DropUserMappingStmt ExplainStmt FetchStmt
GrantStmt GrantRoleStmt IndexStmt InsertStmt ListenStmt LoadStmt
LockStmt NotifyStmt ExplainableStmt PreparableStmt
GrantStmt GrantRoleStmt ImportForeignSchemaStmt IndexStmt InsertStmt
ListenStmt LoadStmt LockStmt NotifyStmt ExplainableStmt PreparableStmt
CreateFunctionStmt AlterFunctionStmt ReindexStmt RemoveAggrStmt
RemoveFuncStmt RemoveOperStmt RenameStmt RevokeStmt RevokeRoleStmt
RuleActionStmt RuleActionStmtOrEmpty RuleStmt
@ -322,6 +330,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <ival> defacl_privilege_target
%type <defelt> DefACLOption
%type <list> DefACLOptionList
%type <ival> import_qualification_type
%type <importqual> import_qualification
%type <list> stmtblock stmtmulti
OptTableElementList TableElementList OptInherit definition
@ -556,7 +566,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
HANDLER HAVING HEADER_P HOLD HOUR_P
IDENTITY_P IF_P ILIKE IMMEDIATE IMMUTABLE IMPLICIT_P IN_P
IDENTITY_P IF_P ILIKE IMMEDIATE IMMUTABLE IMPLICIT_P IMPORT_P IN_P
INCLUDING INCREMENT INDEX INDEXES INHERIT INHERITS INITIALLY INLINE_P
INNER_P INOUT INPUT_P INSENSITIVE INSERT INSTEAD INT_P INTEGER
INTERSECT INTERVAL INTO INVOKER IS ISNULL ISOLATION
@ -802,6 +812,7 @@ stmt :
| FetchStmt
| GrantStmt
| GrantRoleStmt
| ImportForeignSchemaStmt
| IndexStmt
| InsertStmt
| ListenStmt
@ -4272,6 +4283,52 @@ AlterForeignTableStmt:
}
;
/*****************************************************************************
*
* QUERY:
* IMPORT FOREIGN SCHEMA remote_schema
* [ { LIMIT TO | EXCEPT } ( table_list ) ]
* FROM SERVER server_name INTO local_schema [ OPTIONS (...) ]
*
****************************************************************************/
ImportForeignSchemaStmt:
IMPORT_P FOREIGN SCHEMA name import_qualification
FROM SERVER name INTO name create_generic_options
{
ImportForeignSchemaStmt *n = makeNode(ImportForeignSchemaStmt);
n->server_name = $8;
n->remote_schema = $4;
n->local_schema = $10;
n->list_type = $5->type;
n->table_list = $5->table_names;
n->options = $11;
$$ = (Node *) n;
}
;
import_qualification_type:
LIMIT TO { $$ = FDW_IMPORT_SCHEMA_LIMIT_TO; }
| EXCEPT { $$ = FDW_IMPORT_SCHEMA_EXCEPT; }
;
import_qualification:
import_qualification_type '(' relation_expr_list ')'
{
ImportQual *n = (ImportQual *) palloc(sizeof(ImportQual));
n->type = $1;
n->table_names = $3;
$$ = n;
}
| /*EMPTY*/
{
ImportQual *n = (ImportQual *) palloc(sizeof(ImportQual));
n->type = FDW_IMPORT_SCHEMA_ALL;
n->table_names = NIL;
$$ = n;
}
;
/*****************************************************************************
*
* QUERY:
@ -12909,6 +12966,7 @@ unreserved_keyword:
| IMMEDIATE
| IMMUTABLE
| IMPLICIT_P
| IMPORT_P
| INCLUDING
| INCREMENT
| INDEX