From: | Heikki Linnakangas <heikki(dot)linnakangas(at)iki(dot)fi> |
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To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Allow skipping some items in a multi-key GIN search. |
Date: | 2014-01-29 15:54:20 |
Message-ID: | E1W8XT2-0006T5-DM@gemulon.postgresql.org |
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Thread: | |
Lists: | pgsql-committers |
Allow skipping some items in a multi-key GIN search.
In a multi-key search, ie. something like "col @> 'foo' AND col @> 'bar'",
as soon as we find the next item that matches the first criteria, we don't
need to check the second criteria for TIDs smaller the first match. That
saves a lot of effort, especially if one of the terms is rare, while the
second occurs very frequently.
Based on ideas from Alexander Korotkov's fast scan patch.
Branch
------
master
Details
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http://git.postgresql.org/pg/commitdiff/e20c70cb0fa74d5bffa080e21a99b44bf0768667
Modified Files
--------------
src/backend/access/gin/ginget.c | 460 +++++++++++++++++++++------------------
1 file changed, 250 insertions(+), 210 deletions(-)
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