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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-04-16 04:41:03 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-04-16 04:41:03 +0000 |
| commit | 82849df6c637c09fe484ed11e1035c158f128e81 (patch) | |
| tree | ddb8f0f3af666ad331ae05498bd039d2e65e783f /src/backend/tcop/postgres.c | |
| parent | 8c3b52e7b2d90a35be1370a10fcf02218fa4ae99 (diff) | |
| download | postgresql-82849df6c637c09fe484ed11e1035c158f128e81.tar.gz postgresql-82849df6c637c09fe484ed11e1035c158f128e81.zip | |
Add new selectivity estimation functions for pattern-matching operators
(LIKE and regexp matches). These are not yet referenced in pg_operator,
so by default the system will continue to use eqsel/neqsel.
Also, tweak convert_to_scalar() logic so that common prefixes of strings
are stripped off, allowing better accuracy when all strings in a table
share a common prefix.
Diffstat (limited to 'src/backend/tcop/postgres.c')
0 files changed, 0 insertions, 0 deletions