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Give error message, rather than coredump, for utility statements in

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conditional rules (rules with WHERE clauses).  We cannot support these
since there's noplace to hang a condition on a utility statement.
We caught the other case (attempt to attach a condition at rewrite time)
awhile ago, but this one escaped notice until now.
This commit is contained in:
Tom Lane 2001-06-04 16:17:30 +00:00
parent 12c1552066
commit eeaa497e7b
1 changed files with 18 additions and 5 deletions

23
src/backend/parser/analyze.c

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.187 2001/05/22 16:37:15 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.188 2001/06/04 16:17:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1742,13 +1742,15 @@ transformRuleStmt(ParseState *pstate, RuleStmt *stmt)
}
else
{
List *actions;
List *oldactions;
List *newactions = NIL;
/*
* transform each statement, like parse_analyze()
*/
foreach(actions, stmt->actions)
foreach(oldactions, stmt->actions)
{
Node *action = (Node *) lfirst(oldactions);
ParseState *sub_pstate = make_parsestate(pstate->parentParseState);
Query *sub_qry,
*top_subqry;
@ -1775,7 +1777,16 @@ transformRuleStmt(ParseState *pstate, RuleStmt *stmt)
addRTEtoQuery(sub_pstate, newrte, false, true);
/* Transform the rule action statement */
top_subqry = transformStmt(sub_pstate, lfirst(actions));
top_subqry = transformStmt(sub_pstate, action);
/*
* We cannot support utility-statement actions (eg NOTIFY)
* with nonempty rule WHERE conditions, because there's no
* way to make the utility action execute conditionally.
*/
if (top_subqry->commandType == CMD_UTILITY &&
stmt->whereClause != NULL)
elog(ERROR, "Rules with WHERE conditions may only have SELECT, INSERT, UPDATE, or DELETE actions");
/*
* If the action is INSERT...SELECT, OLD/NEW have been pushed
@ -1846,11 +1857,13 @@ transformRuleStmt(ParseState *pstate, RuleStmt *stmt)
sub_qry->jointree->fromlist = sub_pstate->p_joinlist;
}
lfirst(actions) = top_subqry;
newactions = lappend(newactions, top_subqry);
release_pstate_resources(sub_pstate);
pfree(sub_pstate);
}
stmt->actions = newactions;
}
return qry;