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Teach planner to expand sufficiently simple SQL-language functions

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('SELECT expression') inline, like macros, during the constant-folding
phase of planning.  The actual expansion is not difficult, but checking
that we're not changing the semantics of the call turns out to be more
subtle than one might think; in particular must pay attention to
permissions issues, strictness, and volatility.
This commit is contained in:
Tom Lane
2002-12-01 21:05:14 +00:00
parent 02f8c9a382
commit 8e3a87fbd4
4 changed files with 489 additions and 116 deletions
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39
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 1.86 2002/11/25 21:29:42 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.87 2002/12/01 21:05:14 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -415,6 +415,22 @@ op_hashjoinable(Oid opno, Oid ltype, Oid rtype)
return result;
}
/*
* op_strict
*
* Get the proisstrict flag for the operator's underlying function.
*/
bool
op_strict(Oid opno)
{
RegProcedure funcid = get_opcode(opno);
if (funcid == (RegProcedure) InvalidOid)
elog(ERROR, "Operator OID %u does not exist", opno);
return func_strict((Oid) funcid);
}
/*
* op_volatile
*
@ -606,6 +622,27 @@ get_func_retset(Oid funcid)
return result;
}
/*
* func_strict
* Given procedure id, return the function's proisstrict flag.
*/
bool
func_strict(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))->proisstrict;
ReleaseSysCache(tp);
return result;
}
/*
* func_volatile
* Given procedure id, return the function's provolatile flag.