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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-10-18 16:11:42 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-10-18 16:11:42 +0000 |
| commit | 6254465d0621f724cdc9a1e99da24fa8a29f579d (patch) | |
| tree | 84bd08321ce84de9daf6ab5264c889e5b5a92e4e /src/backend/commands/variable.c | |
| parent | 50450049581566ed47016cd89ba03b90be7ea1d0 (diff) | |
| download | postgresql-6254465d0621f724cdc9a1e99da24fa8a29f579d.tar.gz postgresql-6254465d0621f724cdc9a1e99da24fa8a29f579d.zip | |
Extend code that deduces implied equality clauses to detect whether a
clause being added to a particular restriction-clause list is redundant
with those already in the list. This avoids useless work at runtime,
and (perhaps more importantly) keeps the selectivity estimation routines
from generating too-small estimates of numbers of output rows.
Also some minor improvements in OPTIMIZER_DEBUG displays.
Diffstat (limited to 'src/backend/commands/variable.c')
0 files changed, 0 insertions, 0 deletions