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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2004-11-09 00:34:46 +0000 |
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| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2004-11-09 00:34:46 +0000 |
| commit | 547bb4a7f2bdccad9253a99211ce84b3f9de485a (patch) | |
| tree | 0b7c0663dc838f3e7c6400df21959002e03e6beb /src/tutorial/basics.source | |
| parent | e4387116da7d9358f3d6801fe59585e8b9890f46 (diff) | |
| download | postgresql-547bb4a7f2bdccad9253a99211ce84b3f9de485a.tar.gz postgresql-547bb4a7f2bdccad9253a99211ce84b3f9de485a.zip | |
Use a hopefully-more-reliable method of detecting default selectivity
estimates when combining the estimates for a range query. As pointed out
by Miquel van Smoorenburg, the existing check for an impossible combined
result would quite possibly fail to detect one default and one non-default
input. It seems better to use the default range query estimate in such
cases. To do so, add a check for an estimate of exactly DEFAULT_INEQ_SEL.
This is a bit ugly because it introduces additional coupling between
clauselist_selectivity and scalarltsel/scalargtsel, but it's not like
there wasn't plenty already...
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