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Get rid of long-since-vestigial Iter node type, in favor of adding a

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returns-set boolean field in Func and Oper nodes.  This allows cleaner,
more reliable tests for expressions returning sets in the planner and
parser.  For example, a WHERE clause returning a set is now detected
and complained of in the parser, not only at runtime.
This commit is contained in:
Tom Lane
2002-05-12 23:43:04 +00:00
parent f9e4f611a1
commit 3389a110d4
33 changed files with 297 additions and 676 deletions
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23
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 1.72 2002/04/30 01:26:26 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.73 2002/05/12 23:43:03 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -612,6 +612,27 @@ get_func_rettype(Oid funcid)
return result;
}
/*
* get_func_retset
* Given procedure id, return the function's proretset flag.
*/
bool
get_func_retset(Oid funcid)
{
HeapTuple tp;
bool result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "Function OID %u does not exist", funcid);
result = ((Form_pg_proc) GETSTRUCT(tp))->proretset;
ReleaseSysCache(tp);
return result;
}
/*
* func_volatile
* Given procedure id, return the function's provolatile flag.