Tom Lane a2822fb933 Support index-only scans using the visibility map to avoid heap fetches. ... When a btree index contains all columns required by the query, and the visibility map shows that all tuples on a target heap page are visible-to-all, we don't need to fetch that heap page. This patch depends on the previous patches that made the visibility map reliable. There's a fair amount left to do here, notably trying to figure out a less chintzy way of estimating the cost of an index-only scan, but the core functionality seems ready to commit. Robert Haas and Ibrar Ahmed, with some previous work by Heikki Linnakangas.		2011-10-07 20:14:13 -04:00
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src	Support index-only scans using the visibility map to avoid heap fetches.	2011-10-07 20:14:13 -04:00
bug.template	Stamp HEAD as 9.2devel.	2011-06-11 17:46:49 -04:00
KNOWN_BUGS	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
Makefile	Add maintainer-check target	2011-03-28 22:56:52 +03:00
MISSING_FEATURES	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
TODO	Update URL.	2008-08-21 20:15:31 +00:00