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Error out if SKIP LOCKED and WITH TIES are both specified

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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
This commit is contained in:
Alvaro Herrera
2021-10-01 18:29:18 -03:00
parent d186d233df
commit c6bc655ee2
5 changed files with 29 additions and 2 deletions
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3
src/backend/commands/matview.c
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@ -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