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Acquire appropriate locks when rewriting during RMV.

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Since the query has not been freshly parsed when executing REFRESH
MATERIALIZED VIEW, locks must be explicitly taken before rewrite.

Backpatch to 9.3.

Andres Freund
This commit is contained in:
Kevin Grittner 2013-11-02 19:18:08 -05:00
parent be420fa02e
commit 2a781d57dc
1 changed files with 5 additions and 2 deletions
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7
src/backend/commands/matview.c
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@ -283,6 +283,7 @@ refresh_matview_datafill(DestReceiver *dest, Query *query,
Oid save_userid;
int save_sec_context;
int save_nestlevel;
Query *copied_query;
/*
* Switch to the owner's userid, so that any functions are run as that
@ -294,8 +295,10 @@ refresh_matview_datafill(DestReceiver *dest, Query *query,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/* Rewrite, copying the given Query to make sure it's not changed */
rewritten = QueryRewrite((Query *) copyObject(query));
/* Lock and rewrite, using a copy to preserve the original query. */
copied_query = copyObject(query);
AcquireRewriteLocks(copied_query, false);
rewritten = QueryRewrite(copied_query);
/* SELECT should never rewrite to more or less than one SELECT query */
if (list_length(rewritten) != 1)