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Fix markQueryForLocking() to work correctly in the presence of nested views.

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It has been wrong for this case since it was first written for 7.1 :-(
Per report from Pavel Hanák.
This commit is contained in:
Tom Lane 2007-03-01 18:50:56 +00:00
parent b128f53343
commit 88d482cf86
1 changed files with 31 additions and 17 deletions
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48
src/backend/rewrite/rewriteHandler.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.130.2.1 2004/01/14 03:39:29 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.130.2.2 2007/03/01 18:50:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -50,7 +50,7 @@ static void rewriteTargetList(Query *parsetree, Relation target_relation);
static TargetEntry *process_matched_tle(TargetEntry *src_tle,
TargetEntry *prior_tle,
const char *attrName);
static void markQueryForUpdate(Query *qry, bool skipOldNew);
static void markQueryForUpdate(Query *qry, Node *jtnode);
static List *matchLocks(CmdType event, RuleLock *rulelocks,
int varno, Query *parsetree);
static Query *fireRIRrules(Query *parsetree, List *activeRIRs);
@ -678,7 +678,7 @@ ApplyRetrieveRule(Query *parsetree,
/*
* Set up the view's referenced tables as if FOR UPDATE.
*/
markQueryForUpdate(rule_action, true);
markQueryForUpdate(rule_action, (Node *) rule_action->jointree);
}
return parsetree;
@ -691,23 +691,19 @@ ApplyRetrieveRule(Query *parsetree,
* aggregate. We leave it to the planner to detect that.
*
* NB: this must agree with the parser's transformForUpdate() routine.
* However, unlike the parser we have to be careful not to mark a view's
* OLD and NEW rels for updating. The best way to handle that seems to be
* to scan the jointree to determine which rels are used.
*/
static void
markQueryForUpdate(Query *qry, bool skipOldNew)
markQueryForUpdate(Query *qry, Node *jtnode)
{
Index rti = 0;
List *l;
foreach(l, qry->rtable)
if (jtnode == NULL)
return;
if (IsA(jtnode, RangeTblRef))
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
rti++;
/* Ignore OLD and NEW entries if we are at top level of view */
if (skipOldNew &&
(rti == PRS2_OLD_VARNO || rti == PRS2_NEW_VARNO))
continue;
int rti = ((RangeTblRef *) jtnode)->rtindex;
RangeTblEntry *rte = rt_fetch(rti, qry->rtable);
if (rte->rtekind == RTE_RELATION)
{
@ -718,9 +714,27 @@ markQueryForUpdate(Query *qry, bool skipOldNew)
else if (rte->rtekind == RTE_SUBQUERY)
{
/* FOR UPDATE of subquery is propagated to subquery's rels */
markQueryForUpdate(rte->subquery, false);
markQueryForUpdate(rte->subquery, (Node *) rte->subquery->jointree);
}
}
else if (IsA(jtnode, FromExpr))
{
FromExpr *f = (FromExpr *) jtnode;
List *l;
foreach(l, f->fromlist)
markQueryForUpdate(qry, lfirst(l));
}
else if (IsA(jtnode, JoinExpr))
{
JoinExpr *j = (JoinExpr *) jtnode;
markQueryForUpdate(qry, j->larg);
markQueryForUpdate(qry, j->rarg);
}
else
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(jtnode));
}