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Aggregates can be polymorphic, using polymorphic implementation functions.

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It also works to create a non-polymorphic aggregate from polymorphic
functions, should you want to do that.  Regression test added, docs still
lacking.  By Joe Conway, with some kibitzing from Tom Lane.
This commit is contained in:
Tom Lane
2003-07-01 19:10:53 +00:00
parent 02b5d8e371
commit e3b1b6c0cd
15 changed files with 1300 additions and 83 deletions
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32
src/backend/utils/cache/lsyscache.c vendored
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.100 2003/06/27 00:33:25 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.101 2003/07/01 19:10:53 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -718,6 +718,36 @@ get_func_rettype(Oid funcid)
return result;
}
/*
* get_func_signature
* Given procedure id, return the function's argument and result types.
* (The return value is the result type.)
*
* argtypes must point to a vector of size FUNC_MAX_ARGS.
*/
Oid
get_func_signature(Oid funcid, Oid *argtypes, int *nargs)
{
HeapTuple tp;
Form_pg_proc procstruct;
Oid result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "Function OID %u does not exist", funcid);
procstruct = (Form_pg_proc) GETSTRUCT(tp);
result = procstruct->prorettype;
memcpy(argtypes, procstruct->proargtypes, FUNC_MAX_ARGS * sizeof(Oid));
*nargs = (int) procstruct->pronargs;
ReleaseSysCache(tp);
return result;
}
/*
* get_func_retset
* Given procedure id, return the function's proretset flag.