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author | Tom Lane <tgl@sss.pgh.pa.us> | 2015-04-01 17:11:21 -0400 |
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committer | Tom Lane <tgl@sss.pgh.pa.us> | 2015-04-01 17:11:21 -0400 |
commit | 89840d7d3fa943cb932f6a00707fdb17a9cab001 (patch) | |
tree | 1e9b4f8a5fbff0acffa6b5cfa7c7a5da333ce118 /src/backend/utils/adt/numeric.c | |
parent | f770870d9e4d01f4b255a3df6c2c4a2dcfcbcce0 (diff) | |
download | postgresql-89840d7d3fa943cb932f6a00707fdb17a9cab001.tar.gz postgresql-89840d7d3fa943cb932f6a00707fdb17a9cab001.zip |
Provide real selectivity estimators for inet/cidr operators.
This patch fills in the formerly-stub networksel() and networkjoinsel()
estimation functions. Those are used for << <<= >> >>= and && operators
on inet/cidr types. The estimation is not perfect, certainly, because
we rely on the existing statistics collected for the inet btree operators.
But it's a long way better than nothing, and it's not clear that asking
ANALYZE to collect separate stats for these operators would be a win.
Emre Hasegeli, with reviews from Dilip Kumar and Heikki Linnakangas,
and some further hacking by me
Diffstat (limited to 'src/backend/utils/adt/numeric.c')
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