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| author | Amit Kapila <akapila@postgresql.org> | 2018-09-14 10:05:45 +0530 |
|---|---|---|
| committer | Amit Kapila <akapila@postgresql.org> | 2018-09-14 10:05:45 +0530 |
| commit | 1ceb103e7d1e794c0b171b0594fc6936003eb4ab (patch) | |
| tree | 654e600860a858eb03574dd238226c154cdeec41 /src/include/optimizer/planner.h | |
| parent | ede7d8192ca3d1f731d34fb82fdcfc3308b4355f (diff) | |
Don't allow LIMIT/OFFSET clause within sub-selects to be pushed to workers.
Allowing sub-select containing LIMIT/OFFSET in workers can lead to
inconsistent results at the top-level as there is no guarantee that the
row order will be fully deterministic. The fix is to prohibit pushing
LIMIT/OFFSET within sub-selects to workers.
Reported-by: Andrew Fletcher
Bug: 15324
Author: Amit Kapila
Reviewed-by: Dilip Kumar
Backpatch-through: 9.6
Discussion: https://postgr.es/m/153417684333.10284.11356259990921828616@wrigleys.postgresql.org
Diffstat (limited to 'src/include/optimizer/planner.h')
| -rw-r--r-- | src/include/optimizer/planner.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/optimizer/planner.h b/src/include/optimizer/planner.h index 2a4cf71e102..acb709a5552 100644 --- a/src/include/optimizer/planner.h +++ b/src/include/optimizer/planner.h @@ -46,6 +46,8 @@ extern bool is_dummy_plan(Plan *plan); extern RowMarkType select_rowmark_type(RangeTblEntry *rte, LockClauseStrength strength); +extern bool limit_needed(Query *parse); + extern void mark_partial_aggref(Aggref *agg, AggSplit aggsplit); extern Path *get_cheapest_fractional_path(RelOptInfo *rel, |