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Clean up handling of variable-free qual clauses. System now does the

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right thing with variable-free clauses that contain noncachable functions,
such as 'WHERE random() < 0.5' --- these are evaluated once per
potential output tuple.  Expressions that contain only Params are
now candidates to be indexscan quals --- for example, 'var = ($1 + 1)'
can now be indexed.  Cope with RelabelType nodes atop potential indexscan
variables --- this oversight prevents 7.0.* from recognizing some
potentially indexscanable situations.
This commit is contained in:
Tom Lane
2000-08-13 02:50:35 +00:00
parent 766fb7f707
commit 37168b8da4
15 changed files with 410 additions and 177 deletions
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59
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 1.44 2000/07/23 03:50:26 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.45 2000/08/13 02:50:16 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -26,15 +26,15 @@
/*
* op_class
*
* Return t iff operator 'opid' is in operator class 'opclass' for
* Return t iff operator 'opno' is in operator class 'opclass' for
* access method 'amopid'.
*/
bool
op_class(Oid opid, Oid opclass, Oid amopid)
op_class(Oid opno, Oid opclass, Oid amopid)
{
if (HeapTupleIsValid(SearchSysCacheTuple(AMOPOPID,
ObjectIdGetDatum(opclass),
ObjectIdGetDatum(opid),
ObjectIdGetDatum(opno),
ObjectIdGetDatum(amopid),
0)))
return true;
@ -287,7 +287,7 @@ get_opcode(Oid opno)
return optup->oprcode;
}
else
return (RegProcedure) NULL;
return (RegProcedure) InvalidOid;
}
/*
@ -371,17 +371,28 @@ op_hashjoinable(Oid opno, Oid ltype, Oid rtype)
return InvalidOid;
}
/*
* op_iscachable
*
* Get the proiscachable flag for the operator's underlying function.
*/
bool
op_iscachable(Oid opno)
{
RegProcedure funcid = get_opcode(opno);
if (funcid == (RegProcedure) InvalidOid)
elog(ERROR, "Operator OID %u does not exist", opno);
return func_iscachable((Oid) funcid);
}
HeapTuple
get_operator_tuple(Oid opno)
{
HeapTuple optup;
if ((optup = SearchSysCacheTuple(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0)))
return optup;
else
return (HeapTuple) NULL;
return SearchSysCacheTuple(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
}
/*
@ -450,7 +461,7 @@ get_oprrest(Oid opno)
return optup->oprrest;
}
else
return (RegProcedure) NULL;
return (RegProcedure) InvalidOid;
}
/*
@ -473,7 +484,7 @@ get_oprjoin(Oid opno)
return optup->oprjoin;
}
else
return (RegProcedure) NULL;
return (RegProcedure) InvalidOid;
}
/* ---------- FUNCTION CACHE ---------- */
@ -496,6 +507,24 @@ get_func_rettype(Oid funcid)
return ((Form_pg_proc) GETSTRUCT(func_tuple))->prorettype;
}
/*
* func_iscachable
* Given procedure id, return the function's proiscachable flag.
*/
bool
func_iscachable(Oid funcid)
{
HeapTuple func_tuple;
func_tuple = SearchSysCacheTuple(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(func_tuple))
elog(ERROR, "Function OID %u does not exist", funcid);
return ((Form_pg_proc) GETSTRUCT(func_tuple))->proiscachable;
}
/* ---------- RELATION CACHE ---------- */
#ifdef NOT_USED