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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2021-10-01 18:29:18 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2021-10-01 18:29:18 -0300 |
| commit | c6bc655ee2ef09449da7ff688a8be19a13db5c4a (patch) | |
| tree | 71c8f035dd23a0f3f3f53421afc7af19287cf6ea /src/backend | |
| parent | d186d233dfde4afb9dff346e13c8adaf4deec6b3 (diff) | |
| download | postgresql-c6bc655ee2ef09449da7ff688a8be19a13db5c4a.tar.gz postgresql-c6bc655ee2ef09449da7ff688a8be19a13db5c4a.zip | |
Error out if SKIP LOCKED and WITH TIES are both specified
Both bugs #16676[1] and #17141[2] illustrate that the combination of
SKIP LOCKED and FETCH FIRST WITH TIES break expectations when it comes
to rows returned to other sessions accessing the same row. Since this
situation is detectable from the syntax and hard to fix otherwise,
forbid for now, with the potential to fix in the future.
[1] https://postgr.es/m/16676-fd62c3c835880da6@postgresql.org
[2] https://postgr.es/m/17141-913d78b9675aac8e@postgresql.org
Backpatch-through: 13, where WITH TIES was introduced
Author: David Christensen <david.christensen@crunchydata.com>
Discussion: https://postgr.es/m/CAOxo6XLPccCKru3xPMaYDpa+AXyPeWFs+SskrrL+HKwDjJnLhg@mail.gmail.com
Diffstat (limited to 'src/backend')
| -rw-r--r-- | src/backend/commands/matview.c | 3 | ||||
| -rw-r--r-- | src/backend/parser/gram.y | 15 |
2 files changed, 17 insertions, 1 deletions
diff --git a/src/backend/commands/matview.c b/src/backend/commands/matview.c index 512b00bc656..fbbf769a871 100644 --- a/src/backend/commands/matview.c +++ b/src/backend/commands/matview.c @@ -185,7 +185,8 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString, if (concurrent && stmt->skipData) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), - errmsg("CONCURRENTLY and WITH NO DATA options cannot be used together"))); + errmsg("%s and %s options cannot be used together", + "CONCURRENTLY", "WITH NO DATA"))); /* * Check that everything is correct for a refresh. Problems at this point diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y index e3068a374ee..08f1bf1031c 100644 --- a/src/backend/parser/gram.y +++ b/src/backend/parser/gram.y @@ -16816,6 +16816,21 @@ insertSelectOptions(SelectStmt *stmt, ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("WITH TIES cannot be specified without ORDER BY clause"))); + if (limitClause->limitOption == LIMIT_OPTION_WITH_TIES && stmt->lockingClause) + { + ListCell *lc; + + foreach(lc, stmt->lockingClause) + { + LockingClause *lock = lfirst_node(LockingClause, lc); + + if (lock->waitPolicy == LockWaitSkip) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("%s and %s options cannot be used together", + "SKIP LOCKED", "WITH TIES"))); + } + } stmt->limitOption = limitClause->limitOption; } if (withClause) |