Thread: pgsql: Re-enable error for "SELECT ... OFFSET -1".

Re-enable error for "SELECT ... OFFSET -1".

The executor has thrown errors for negative OFFSET values since 8.4 (see
commit bfce56eea45b1369b7bb2150a150d1ac109f5073), but in a moment of brain
fade I taught the planner that OFFSET with a constant negative value was a
no-op (commit 1a1832eb085e5bca198735e5d0e766a3cb61b8fc).  Reinstate the
former behavior by only discarding OFFSET with a value of exactly 0.  In
passing, adjust a planner comment that referenced the ancient behavior.

Back-patch to 9.3 where the mistake was introduced.

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/6306d07122d8b6678f47c273165540de02a0d242

Modified Files
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src/backend/optimizer/plan/planner.c |    7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)