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Commit15455e1

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committed
Eliminate RewritePreprocessQuery, which was taking an
unreasonable amount of time to clean up after a vanished parser problem.Don't call fireRIRonSubselect when we know there are no subselects,either.
1 parentc6f5f85 commit15455e1

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1 file changed

+22
-72
lines changed

1 file changed

+22
-72
lines changed

‎src/backend/rewrite/rewriteHandler.c

Lines changed: 22 additions & 72 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
*
77
*
88
* IDENTIFICATION
9-
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.61 1999/10/17 23:50:43 tgl Exp $
9+
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.62 1999/11/01 05:18:31 tgl Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
@@ -491,7 +491,7 @@ modifyAggrefMakeSublink(Expr *origexp, Query *parsetree)
491491
target= (Var*) (aggref->target);
492492
if (!IsA(target,Var))
493493
elog(ERROR,"rewrite: aggregates of views only allowed on simple variables for now");
494-
rte=(RangeTblEntry*)nth(target->varno-1,parsetree->rtable);
494+
rte=rt_fetch(target->varno,parsetree->rtable);
495495

496496
resdom=makeNode(Resdom);
497497
resdom->resno=1;
@@ -916,7 +916,7 @@ ApplyRetrieveRule(Query *parsetree,
916916

917917
if (relation_level)
918918
{
919-
RangeTblEntry*rte=(RangeTblEntry*)nth(rt_index-1,rtable);
919+
RangeTblEntry*rte=rt_fetch(rt_index,rtable);
920920

921921
parsetree= (Query*)apply_RIR_view((Node*)parsetree,
922922
rt_index,rte,
@@ -1024,7 +1024,7 @@ fireRIRrules(Query *parsetree)
10241024
{
10251025
++rt_index;
10261026

1027-
rte=nth(rt_index-1,parsetree->rtable);
1027+
rte=rt_fetch(rt_index,parsetree->rtable);
10281028

10291029
/*
10301030
* If the table is not one named in the original FROM clause
@@ -1110,7 +1110,8 @@ fireRIRrules(Query *parsetree)
11101110
heap_close(rel,AccessShareLock);
11111111
}
11121112

1113-
fireRIRonSubselect((Node*)parsetree,NULL);
1113+
if (parsetree->hasSubLinks)
1114+
fireRIRonSubselect((Node*)parsetree,NULL);
11141115

11151116
parsetree->qual=modifyAggrefQual(parsetree->qual,parsetree);
11161117

@@ -1246,8 +1247,7 @@ fireRules(Query *parsetree,
12461247
break;
12471248
}
12481249

1249-
rte= (RangeTblEntry*)nth(parsetree->resultRelation-1,
1250-
parsetree->rtable);
1250+
rte=rt_fetch(parsetree->resultRelation,parsetree->rtable);
12511251
if (!rte->skipAcl)
12521252
{
12531253
acl_rc=pg_aclcheck(rte->relname,
@@ -1546,50 +1546,6 @@ QueryRewriteOne(Query *parsetree)
15461546
}
15471547

15481548

1549-
/* ----------
1550-
* RewritePreprocessQuery -
1551-
*adjust details in the parsetree, the rule system
1552-
*depends on
1553-
* ----------
1554-
*/
1555-
staticvoid
1556-
RewritePreprocessQuery(Query*parsetree)
1557-
{
1558-
/* ----------
1559-
* if the query has a resultRelation, reassign the
1560-
* result domain numbers to the attribute numbers in the
1561-
* target relation. FixNew() depends on it when replacing
1562-
* *new* references in a rule action by the expressions
1563-
* from the rewritten query.
1564-
* resjunk targets are somewhat arbitrarily given a resno of 0;
1565-
* this is to prevent FixNew() from matching them to var nodes.
1566-
* ----------
1567-
*/
1568-
if (parsetree->resultRelation>0)
1569-
{
1570-
RangeTblEntry*rte;
1571-
Relationrd;
1572-
List*tl;
1573-
1574-
rte= (RangeTblEntry*)nth(parsetree->resultRelation-1,
1575-
parsetree->rtable);
1576-
rd=heap_openr(rte->relname,AccessShareLock);
1577-
1578-
foreach(tl,parsetree->targetList)
1579-
{
1580-
TargetEntry*tle= (TargetEntry*)lfirst(tl);
1581-
1582-
if (!tle->resdom->resjunk)
1583-
tle->resdom->resno=attnameAttNum(rd,tle->resdom->resname);
1584-
else
1585-
tle->resdom->resno=0;
1586-
}
1587-
1588-
heap_close(rd,AccessShareLock);
1589-
}
1590-
}
1591-
1592-
15931549
/*
15941550
* BasicQueryRewrite -
15951551
* rewrite one query via query rewrite system, possibly returning 0
@@ -1606,20 +1562,12 @@ BasicQueryRewrite(Query *parsetree)
16061562
/*
16071563
* Step 1
16081564
*
1609-
* There still seems something broken with the resdom numbers so we
1610-
* reassign them first.
1611-
*/
1612-
RewritePreprocessQuery(parsetree);
1613-
1614-
/*
1615-
* Step 2
1616-
*
16171565
* Apply all non-SELECT rules possibly getting 0 or many queries
16181566
*/
16191567
querylist=QueryRewriteOne(parsetree);
16201568

16211569
/*
1622-
* Step3
1570+
* Step2
16231571
*
16241572
* Apply all the RIR rules on each query
16251573
*/
@@ -1629,17 +1577,20 @@ BasicQueryRewrite(Query *parsetree)
16291577

16301578
/*
16311579
* If the query was marked having aggregates, check if this is
1632-
* still true after rewriting. This check must get expanded when
1633-
* someday aggregates can appear somewhere else than in the
1634-
* targetlist or the having qual.
1580+
* still true after rewriting. Ditto for sublinks.
1581+
*
1582+
* This check must get expanded when someday aggregates can appear
1583+
* somewhere else than in the targetlist or the having qual.
16351584
*/
16361585
if (query->hasAggs)
16371586
query->hasAggs=checkQueryHasAggs((Node*) (query->targetList))
16381587
||checkQueryHasAggs((Node*) (query->havingQual));
1639-
query->hasSubLinks=checkQueryHasSubLink((Node*) (query->qual))
1640-
||checkQueryHasSubLink((Node*) (query->havingQual));
1588+
if (query->hasSubLinks)
1589+
query->hasSubLinks=checkQueryHasSubLink((Node*) (query->qual))
1590+
||checkQueryHasSubLink((Node*) (query->havingQual));
16411591
results=lappend(results,query);
16421592
}
1593+
16431594
returnresults;
16441595
}
16451596

@@ -1809,8 +1760,7 @@ Except_Intersect_Rewrite(Query *parsetree)
18091760
Node*limitOffset,
18101761
*limitCount;
18111762
CmdTypecommandType=CMD_SELECT;
1812-
List*rtable_insert=NIL;
1813-
1763+
RangeTblEntry*rtable_insert=NULL;
18141764
List*prev_target=NIL;
18151765

18161766
/*
@@ -1837,15 +1787,15 @@ Except_Intersect_Rewrite(Query *parsetree)
18371787
*/
18381788
if (parsetree->commandType==CMD_INSERT)
18391789
{
1840-
parsetree->commandType=CMD_SELECT;
1841-
commandType=CMD_INSERT;
1842-
parsetree->resultRelation=0;
1843-
18441790
/*
18451791
* The result relation ( = the one to insert into) has to be
18461792
* attached to the rtable list of the new top node
18471793
*/
1848-
rtable_insert=nth(length(parsetree->rtable)-1,parsetree->rtable);
1794+
rtable_insert=rt_fetch(parsetree->resultRelation,parsetree->rtable);
1795+
1796+
parsetree->commandType=CMD_SELECT;
1797+
commandType=CMD_INSERT;
1798+
parsetree->resultRelation=0;
18491799
}
18501800

18511801
/*

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