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/*-------------------------------------------------------------------------
*
* pg_aggregate.c
* routines to support manipulation of the pg_aggregate relation
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/catalog/pg_aggregate.c,v 1.47 2002/05/21 22:05:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_language.h"
#include "catalog/pg_proc.h"
#include "optimizer/cost.h"
#include "parser/parse_coerce.h"
#include "parser/parse_func.h"
#include "utils/builtins.h"
#include "utils/syscache.h"
/*
* AggregateCreate
*/
void
AggregateCreate(const char *aggName,
Oid aggNamespace,
List *aggtransfnName,
List *aggfinalfnName,
Oid aggBaseType,
Oid aggTransType,
const char *agginitval)
{
Relation aggdesc;
HeapTuple tup;
char nulls[Natts_pg_aggregate];
Datum values[Natts_pg_aggregate];
Form_pg_proc proc;
Oid transfn;
Oid finalfn = InvalidOid; /* can be omitted */
Oid finaltype;
Oid fnArgs[FUNC_MAX_ARGS];
int nargs;
Oid procOid;
TupleDesc tupDesc;
int i;
/* sanity checks */
if (!aggName)
elog(ERROR, "no aggregate name supplied");
if (!aggtransfnName)
elog(ERROR, "aggregate must have a transition function");
/* handle transfn */
MemSet(fnArgs, 0, FUNC_MAX_ARGS * sizeof(Oid));
fnArgs[0] = aggTransType;
if (OidIsValid(aggBaseType))
{
fnArgs[1] = aggBaseType;
nargs = 2;
}
else
nargs = 1;
transfn = LookupFuncName(aggtransfnName, nargs, fnArgs);
if (!OidIsValid(transfn))
func_error("AggregateCreate", aggtransfnName, nargs, fnArgs, NULL);
tup = SearchSysCache(PROCOID,
ObjectIdGetDatum(transfn),
0, 0, 0);
if (!HeapTupleIsValid(tup))
func_error("AggregateCreate", aggtransfnName, nargs, fnArgs, NULL);
proc = (Form_pg_proc) GETSTRUCT(tup);
if (proc->prorettype != aggTransType)
elog(ERROR, "return type of transition function %s is not %s",
NameListToString(aggtransfnName), format_type_be(aggTransType));
/*
* If the transfn is strict and the initval is NULL, make sure input
* type and transtype are the same (or at least binary-compatible),
* so that it's OK to use the first input value as the initial
* transValue.
*/
if (proc->proisstrict && agginitval == NULL)
{
if (!IsBinaryCompatible(aggBaseType, aggTransType))
elog(ERROR, "must not omit initval when transfn is strict and transtype is not compatible with input type");
}
ReleaseSysCache(tup);
/* handle finalfn, if supplied */
if (aggfinalfnName)
{
MemSet(fnArgs, 0, FUNC_MAX_ARGS * sizeof(Oid));
fnArgs[0] = aggTransType;
finalfn = LookupFuncName(aggfinalfnName, 1, fnArgs);
if (!OidIsValid(finalfn))
func_error("AggregateCreate", aggfinalfnName, 1, fnArgs, NULL);
tup = SearchSysCache(PROCOID,
ObjectIdGetDatum(finalfn),
0, 0, 0);
if (!HeapTupleIsValid(tup))
func_error("AggregateCreate", aggfinalfnName, 1, fnArgs, NULL);
proc = (Form_pg_proc) GETSTRUCT(tup);
finaltype = proc->prorettype;
ReleaseSysCache(tup);
}
else
{
/*
* If no finalfn, aggregate result type is type of the state value
*/
finaltype = aggTransType;
}
Assert(OidIsValid(finaltype));
/*
* Everything looks okay. Try to create the pg_proc entry for the
* aggregate. (This could fail if there's already a conflicting entry.)
*/
MemSet(fnArgs, 0, FUNC_MAX_ARGS * sizeof(Oid));
fnArgs[0] = aggBaseType;
procOid = ProcedureCreate(aggName,
aggNamespace,
false, /* no replacement */
false, /* doesn't return a set */
finaltype, /* returnType */
INTERNALlanguageId, /* languageObjectId */
"aggregate_dummy", /* placeholder proc */
"-", /* probin */
true, /* isAgg */
false, /* security invoker (currently not definable for agg) */
false, /* isImplicit */
false, /* isStrict (not needed for agg) */
PROVOLATILE_IMMUTABLE, /* volatility (not needed for agg) */
BYTE_PCT, /* default cost values */
PERBYTE_CPU,
PERCALL_CPU,
OUTIN_RATIO,
1, /* parameterCount */
fnArgs); /* parameterTypes */
/*
* Okay to create the pg_aggregate entry.
*/
/* initialize nulls and values */
for (i = 0; i < Natts_pg_aggregate; i++)
{
nulls[i] = ' ';
values[i] = (Datum) NULL;
}
values[Anum_pg_aggregate_aggfnoid - 1] = ObjectIdGetDatum(procOid);
values[Anum_pg_aggregate_aggtransfn - 1] = ObjectIdGetDatum(transfn);
values[Anum_pg_aggregate_aggfinalfn - 1] = ObjectIdGetDatum(finalfn);
values[Anum_pg_aggregate_aggtranstype - 1] = ObjectIdGetDatum(aggTransType);
if (agginitval)
values[Anum_pg_aggregate_agginitval - 1] =
DirectFunctionCall1(textin, CStringGetDatum(agginitval));
else
nulls[Anum_pg_aggregate_agginitval - 1] = 'n';
aggdesc = heap_openr(AggregateRelationName, RowExclusiveLock);
tupDesc = aggdesc->rd_att;
tup = heap_formtuple(tupDesc, values, nulls);
simple_heap_insert(aggdesc, tup);
if (RelationGetForm(aggdesc)->relhasindex)
{
Relation idescs[Num_pg_aggregate_indices];
CatalogOpenIndices(Num_pg_aggregate_indices, Name_pg_aggregate_indices, idescs);
CatalogIndexInsert(idescs, Num_pg_aggregate_indices, aggdesc, tup);
CatalogCloseIndices(Num_pg_aggregate_indices, idescs);
}
heap_close(aggdesc, RowExclusiveLock);
}
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