Add new selectivity estimation functions for pattern-matching operators

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(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.

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This commit is contained in:

Tom Lane

2000-04-16 04:41:03 +00:00

parent 8c3b52e7b2

commit 82849df6c6

5 changed files with 1340 additions and 470 deletions

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src/backend/utils/adt/selfuncs.c

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