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Change expandRTE() and ResolveNew() back to taking just the single

RTE of interest, rather than the whole rangetable list.  This makes
the API more understandable and avoids duplicate RTE lookups.  This
patch reverts no-longer-needed portions of my patch of 2004-08-19.
This commit is contained in:
Tom Lane
2005-06-04 19:19:42 +00:00
parent fb91a83e0e
commit e18e8f8735
11 changed files with 92 additions and 94 deletions

View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/rewrite/rewriteHandler.c,v 1.153 2005/06/03 23:05:28 tgl Exp $
* $PostgreSQL: pgsql/src/backend/rewrite/rewriteHandler.c,v 1.154 2005/06/04 19:19:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -106,6 +106,8 @@ AcquireRewriteLocks(Query *parsetree)
Relation rel;
LOCKMODE lockmode;
List *newaliasvars;
Index curinputvarno;
RangeTblEntry *curinputrte;
ListCell *ll;
++rt_index;
@ -140,8 +142,14 @@ AcquireRewriteLocks(Query *parsetree)
* Scan the join's alias var list to see if any columns
* have been dropped, and if so replace those Vars with
* NULL Consts.
*
* Since a join has only two inputs, we can expect to
* see multiple references to the same input RTE; optimize
* away multiple fetches.
*/
newaliasvars = NIL;
curinputvarno = 0;
curinputrte = NULL;
foreach(ll, rte->joinaliasvars)
{
Var *aliasvar = (Var *) lfirst(ll);
@ -165,12 +173,17 @@ AcquireRewriteLocks(Query *parsetree)
* but it's OK to assume here.)
*/
Assert(aliasvar->varlevelsup == 0);
if (aliasvar->varno >= rt_index)
elog(ERROR, "unexpected varno %d in JOIN RTE %d",
aliasvar->varno, rt_index);
if (get_rte_attribute_is_dropped(
rt_fetch(aliasvar->varno, parsetree->rtable),
aliasvar->varattno))
if (aliasvar->varno != curinputvarno)
{
curinputvarno = aliasvar->varno;
if (curinputvarno >= rt_index)
elog(ERROR, "unexpected varno %d in JOIN RTE %d",
curinputvarno, rt_index);
curinputrte = rt_fetch(curinputvarno,
parsetree->rtable);
}
if (get_rte_attribute_is_dropped(curinputrte,
aliasvar->varattno))
{
/*
* can't use vartype here, since that might be a
@ -386,7 +399,8 @@ rewriteRuleAction(Query *parsetree,
sub_action = (Query *) ResolveNew((Node *) sub_action,
new_varno,
0,
sub_action->rtable,
rt_fetch(new_varno,
sub_action->rtable),
parsetree->targetList,
event,
current_varno);
@ -1206,7 +1220,7 @@ CopyAndAddInvertedQual(Query *parsetree,
new_qual = ResolveNew(new_qual,
PRS2_NEW_VARNO,
0,
parsetree->rtable,
rt_fetch(rt_index, parsetree->rtable),
parsetree->targetList,
event,
rt_index);