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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2010-02-10 03:38:35 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2010-02-10 03:38:35 +0000 |
| commit | 76b6ee3f380b90956a1ca18f15e2a70874651f66 (patch) | |
| tree | 6c2bbc7bfab237f7cf51b006f7698d2abf4a9085 /src/backend/executor/nodeWindowAgg.c | |
| parent | cbe9d6beb4ae1cb20c08cab29b534be4923b6768 (diff) | |
| download | postgresql-76b6ee3f380b90956a1ca18f15e2a70874651f66.tar.gz postgresql-76b6ee3f380b90956a1ca18f15e2a70874651f66.zip | |
Improve planner's choices about when to use hashing vs sorting for DISTINCT.
The previous coding missed a bet by sometimes picking the "sorted" path
from query_planner even though hashing would be preferable. To fix, we have
to be willing to make the choice sooner. This contorts things a little bit,
but I thought of a factorization that makes it not too awful.
Diffstat (limited to 'src/backend/executor/nodeWindowAgg.c')
0 files changed, 0 insertions, 0 deletions