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c219d9b0a5
This reduces unnecessary exposure of other headers through htup.h, which is very widely included by many files. I have chosen to move the function prototypes to the new file as well, because that means htup.h no longer needs to include tupdesc.h. In itself this doesn't have much effect in indirect inclusion of tupdesc.h throughout the tree, because it's also required by execnodes.h; but it's something to explore in the future, and it seemed best to do the htup.h change now while I'm busy with it.
285 lines
8.3 KiB
C
285 lines
8.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* aggregatecmds.c
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*
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* Routines for aggregate-manipulation commands
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*
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/commands/aggregatecmds.c
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*
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* DESCRIPTION
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* The "DefineFoo" routines take the parse tree and pick out the
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* appropriate arguments/flags, passing the results to the
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* corresponding "FooDefine" routines (in src/catalog) that do
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* the actual catalog-munging. These routines also verify permission
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* of the user to execute the command.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "access/htup_details.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_aggregate.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_type.h"
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#include "commands/defrem.h"
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#include "miscadmin.h"
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#include "parser/parse_func.h"
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#include "parser/parse_type.h"
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#include "utils/acl.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/syscache.h"
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/*
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* DefineAggregate
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*
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* "oldstyle" signals the old (pre-8.2) style where the aggregate input type
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* is specified by a BASETYPE element in the parameters. Otherwise,
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* "args" defines the input type(s).
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*/
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void
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DefineAggregate(List *name, List *args, bool oldstyle, List *parameters)
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{
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char *aggName;
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Oid aggNamespace;
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AclResult aclresult;
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List *transfuncName = NIL;
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List *finalfuncName = NIL;
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List *sortoperatorName = NIL;
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TypeName *baseType = NULL;
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TypeName *transType = NULL;
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char *initval = NULL;
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Oid *aggArgTypes;
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int numArgs;
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Oid transTypeId;
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ListCell *pl;
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/* Convert list of names to a name and namespace */
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aggNamespace = QualifiedNameGetCreationNamespace(name, &aggName);
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/* Check we have creation rights in target namespace */
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aclresult = pg_namespace_aclcheck(aggNamespace, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(aggNamespace));
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foreach(pl, parameters)
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{
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DefElem *defel = (DefElem *) lfirst(pl);
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/*
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* sfunc1, stype1, and initcond1 are accepted as obsolete spellings
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* for sfunc, stype, initcond.
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*/
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if (pg_strcasecmp(defel->defname, "sfunc") == 0)
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transfuncName = defGetQualifiedName(defel);
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else if (pg_strcasecmp(defel->defname, "sfunc1") == 0)
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transfuncName = defGetQualifiedName(defel);
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else if (pg_strcasecmp(defel->defname, "finalfunc") == 0)
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finalfuncName = defGetQualifiedName(defel);
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else if (pg_strcasecmp(defel->defname, "sortop") == 0)
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sortoperatorName = defGetQualifiedName(defel);
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else if (pg_strcasecmp(defel->defname, "basetype") == 0)
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baseType = defGetTypeName(defel);
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else if (pg_strcasecmp(defel->defname, "stype") == 0)
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transType = defGetTypeName(defel);
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else if (pg_strcasecmp(defel->defname, "stype1") == 0)
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transType = defGetTypeName(defel);
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else if (pg_strcasecmp(defel->defname, "initcond") == 0)
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initval = defGetString(defel);
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else if (pg_strcasecmp(defel->defname, "initcond1") == 0)
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initval = defGetString(defel);
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else
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ereport(WARNING,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("aggregate attribute \"%s\" not recognized",
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defel->defname)));
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}
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/*
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* make sure we have our required definitions
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*/
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if (transType == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
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errmsg("aggregate stype must be specified")));
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if (transfuncName == NIL)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
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errmsg("aggregate sfunc must be specified")));
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/*
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* look up the aggregate's input datatype(s).
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*/
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if (oldstyle)
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{
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/*
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* Old style: use basetype parameter. This supports aggregates of
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* zero or one input, with input type ANY meaning zero inputs.
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*
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* Historically we allowed the command to look like basetype = 'ANY'
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* so we must do a case-insensitive comparison for the name ANY. Ugh.
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*/
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if (baseType == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
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errmsg("aggregate input type must be specified")));
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if (pg_strcasecmp(TypeNameToString(baseType), "ANY") == 0)
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{
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numArgs = 0;
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aggArgTypes = NULL;
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}
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else
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{
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numArgs = 1;
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aggArgTypes = (Oid *) palloc(sizeof(Oid));
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aggArgTypes[0] = typenameTypeId(NULL, baseType);
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}
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}
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else
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{
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/*
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* New style: args is a list of TypeNames (possibly zero of 'em).
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*/
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ListCell *lc;
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int i = 0;
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if (baseType != NULL)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
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errmsg("basetype is redundant with aggregate input type specification")));
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numArgs = list_length(args);
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aggArgTypes = (Oid *) palloc(sizeof(Oid) * numArgs);
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foreach(lc, args)
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{
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TypeName *curTypeName = (TypeName *) lfirst(lc);
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aggArgTypes[i++] = typenameTypeId(NULL, curTypeName);
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}
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}
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/*
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* look up the aggregate's transtype.
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*
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* transtype can't be a pseudo-type, since we need to be able to store
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* values of the transtype. However, we can allow polymorphic transtype
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* in some cases (AggregateCreate will check). Also, we allow "internal"
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* for functions that want to pass pointers to private data structures;
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* but allow that only to superusers, since you could crash the system (or
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* worse) by connecting up incompatible internal-using functions in an
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* aggregate.
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*/
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transTypeId = typenameTypeId(NULL, transType);
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if (get_typtype(transTypeId) == TYPTYPE_PSEUDO &&
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!IsPolymorphicType(transTypeId))
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{
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if (transTypeId == INTERNALOID && superuser())
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/* okay */ ;
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else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
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errmsg("aggregate transition data type cannot be %s",
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format_type_be(transTypeId))));
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}
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/*
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* Most of the argument-checking is done inside of AggregateCreate
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*/
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AggregateCreate(aggName, /* aggregate name */
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aggNamespace, /* namespace */
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aggArgTypes, /* input data type(s) */
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numArgs,
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transfuncName, /* step function name */
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finalfuncName, /* final function name */
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sortoperatorName, /* sort operator name */
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transTypeId, /* transition data type */
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initval); /* initial condition */
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}
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/*
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* RenameAggregate
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* Rename an aggregate.
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*/
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void
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RenameAggregate(List *name, List *args, const char *newname)
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{
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Oid procOid;
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Oid namespaceOid;
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HeapTuple tup;
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Form_pg_proc procForm;
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Relation rel;
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AclResult aclresult;
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rel = heap_open(ProcedureRelationId, RowExclusiveLock);
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/* Look up function and make sure it's an aggregate */
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procOid = LookupAggNameTypeNames(name, args, false);
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tup = SearchSysCacheCopy1(PROCOID, ObjectIdGetDatum(procOid));
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if (!HeapTupleIsValid(tup)) /* should not happen */
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elog(ERROR, "cache lookup failed for function %u", procOid);
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procForm = (Form_pg_proc) GETSTRUCT(tup);
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namespaceOid = procForm->pronamespace;
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/* make sure the new name doesn't exist */
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if (SearchSysCacheExists3(PROCNAMEARGSNSP,
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CStringGetDatum(newname),
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PointerGetDatum(&procForm->proargtypes),
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ObjectIdGetDatum(namespaceOid)))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_FUNCTION),
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errmsg("function %s already exists in schema \"%s\"",
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funcname_signature_string(newname,
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procForm->pronargs,
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NIL,
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procForm->proargtypes.values),
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get_namespace_name(namespaceOid))));
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/* must be owner */
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if (!pg_proc_ownercheck(procOid, GetUserId()))
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aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
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NameListToString(name));
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/* must have CREATE privilege on namespace */
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aclresult = pg_namespace_aclcheck(namespaceOid, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(namespaceOid));
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/* rename */
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namestrcpy(&(((Form_pg_proc) GETSTRUCT(tup))->proname), newname);
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simple_heap_update(rel, &tup->t_self, tup);
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CatalogUpdateIndexes(rel, tup);
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heap_close(rel, NoLock);
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heap_freetuple(tup);
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}
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/*
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* Change aggregate owner
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*/
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void
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AlterAggregateOwner(List *name, List *args, Oid newOwnerId)
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{
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Oid procOid;
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/* Look up function and make sure it's an aggregate */
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procOid = LookupAggNameTypeNames(name, args, false);
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/* The rest is just like a function */
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AlterFunctionOwner_oid(procOid, newOwnerId);
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}
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