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Make application of FOR UPDATE to a view work exactly like the parser's

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transformForUpdate does: it should recurse into subqueries.
This commit is contained in:
Tom Lane 2000-12-07 01:22:25 +00:00
parent 0a844e84a1
commit 7711e40b9f
1 changed files with 42 additions and 22 deletions
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64
src/backend/rewrite/rewriteHandler.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.85 2000/12/06 23:55:18 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.86 2000/12/07 01:22:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -38,6 +38,7 @@ static RewriteInfo *gatherRewriteMeta(Query *parsetree,
CmdType event,
bool instead_flag);
static List *adjustJoinTreeList(Query *parsetree, int rt_index, bool *found);
static void markQueryForUpdate(Query *qry, bool skipOldNew);
static List *matchLocks(CmdType event, RuleLock *rulelocks,
int varno, Query *parsetree);
static Query *fireRIRrules(Query *parsetree);
@ -263,7 +264,6 @@ ApplyRetrieveRule(Query *parsetree,
Query *rule_action;
RangeTblEntry *rte,
*subrte;
List *l;
if (length(rule->actions) != 1)
elog(ERROR, "ApplyRetrieveRule: expected just one rule action");
@ -308,8 +308,6 @@ ApplyRetrieveRule(Query *parsetree,
*/
if (intMember(rt_index, parsetree->rowMarks))
{
Index innerrti = 1;
/*
* Remove the view from the list of rels that will actually be
* marked FOR UPDATE by the executor. It will still be access-
@ -320,29 +318,51 @@ ApplyRetrieveRule(Query *parsetree,
/*
* Set up the view's referenced tables as if FOR UPDATE.
*/
foreach(l, rule_action->rtable)
{
subrte = (RangeTblEntry *) lfirst(l);
/*
* RTable of VIEW has two entries of VIEW itself - skip them!
* Also keep hands off of sub-subqueries.
*/
if (innerrti != PRS2_OLD_VARNO && innerrti != PRS2_NEW_VARNO &&
subrte->relid != InvalidOid)
{
if (!intMember(innerrti, rule_action->rowMarks))
rule_action->rowMarks = lappendi(rule_action->rowMarks,
innerrti);
subrte->checkForWrite = true;
}
innerrti++;
}
markQueryForUpdate(rule_action, true);
}
return parsetree;
}
/*
* Recursively mark all relations used by a view as FOR UPDATE.
*
* 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 transformForUpdate() routine.
*/
static void
markQueryForUpdate(Query *qry, bool skipOldNew)
{
Index rti = 0;
List *l;
foreach(l, qry->rtable)
{
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;
if (rte->subquery)
{
/* FOR UPDATE of subquery is propagated to subquery's rels */
markQueryForUpdate(rte->subquery, false);
}
else
{
if (!intMember(rti, qry->rowMarks))
qry->rowMarks = lappendi(qry->rowMarks, rti);
rte->checkForWrite = true;
}
}
}
/*
* fireRIRonSubLink -