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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 18:50:42 +00:00
parent e9a97570fa
commit 3b14809f92
1 changed files with 36 additions and 20 deletions
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56
src/backend/rewrite/rewriteHandler.c
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 1.158.2.2 2005/11/23 17:21:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/rewrite/rewriteHandler.c,v 1.158.2.3 2007/03/01 18:50:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -52,8 +52,8 @@ static TargetEntry *process_matched_tle(TargetEntry *src_tle,
TargetEntry *prior_tle,
const char *attrName);
static Node *get_assignment_input(Node *node);
static void markQueryForLocking(Query *qry, bool forUpdate, bool noWait,
bool skipOldNew);
static void markQueryForLocking(Query *qry, Node *jtnode,
bool forUpdate, bool noWait);
static List *matchLocks(CmdType event, RuleLock *rulelocks,
int varno, Query *parsetree);
static Query *fireRIRrules(Query *parsetree, List *activeRIRs);
@@ -966,8 +966,8 @@ ApplyRetrieveRule(Query *parsetree,
/*
* Set up the view's referenced tables as if FOR UPDATE/SHARE.
*/
markQueryForLocking(rule_action, parsetree->forUpdate,
parsetree->rowNoWait, true);
markQueryForLocking(rule_action, (Node *) rule_action->jointree,
parsetree->forUpdate, parsetree->rowNoWait);
}
return parsetree;
@@ -979,14 +979,15 @@ ApplyRetrieveRule(Query *parsetree,
* This may generate an invalid query, eg if some sub-query uses an
* aggregate. We leave it to the planner to detect that.
*
* NB: this must agree with the parser's transformLocking() routine.
* NB: this must agree with the parser's transformLockingClause() 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
markQueryForLocking(Query *qry, bool forUpdate, bool noWait, bool skipOldNew)
markQueryForLocking(Query *qry, Node *jtnode, bool forUpdate, bool noWait)
{
Index rti = 0;
ListCell *l;
/* when recursing, this check is redundant; cheap enough not to worry */
if (qry->rowMarks)
{
if (forUpdate != qry->forUpdate)
@@ -1001,16 +1002,12 @@ markQueryForLocking(Query *qry, bool forUpdate, bool noWait, bool skipOldNew)
qry->forUpdate = forUpdate;
qry->rowNoWait = noWait;
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)
{
@@ -1020,9 +1017,28 @@ markQueryForLocking(Query *qry, bool forUpdate, bool noWait, bool skipOldNew)
else if (rte->rtekind == RTE_SUBQUERY)
{
/* FOR UPDATE/SHARE of subquery is propagated to subquery's rels */
markQueryForLocking(rte->subquery, forUpdate, noWait, false);
markQueryForLocking(rte->subquery, (Node *) rte->subquery->jointree,
forUpdate, noWait);
}
}
else if (IsA(jtnode, FromExpr))
{
FromExpr *f = (FromExpr *) jtnode;
ListCell *l;
foreach(l, f->fromlist)
markQueryForLocking(qry, lfirst(l), forUpdate, noWait);
}
else if (IsA(jtnode, JoinExpr))
{
JoinExpr *j = (JoinExpr *) jtnode;
markQueryForLocking(qry, j->larg, forUpdate, noWait);
markQueryForLocking(qry, j->rarg, forUpdate, noWait);
}
else
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(jtnode));
}