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Tom Lane e6858e6657 Measure the number of all-visible pages for use in index-only scan costing. ... Add a column pg_class.relallvisible to remember the number of pages that were all-visible according to the visibility map as of the last VACUUM (or ANALYZE, or some other operations that update pg_class.relpages). Use relallvisible/relpages, instead of an arbitrary constant, to estimate how many heap page fetches can be avoided during an index-only scan. This is pretty primitive and will no doubt see refinements once we've acquired more field experience with the index-only scan mechanism, but it's way better than using a constant. Note: I had to adjust an underspecified query in the window.sql regression test, because it was changing answers when the plan changed to use an index-only scan. Some of the adjacent tests perhaps should be adjusted as well, but I didn't do that here.		14 years ago
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examples	Capitalization fixes	14 years ago
isolation	Remove dependency on error ordering in isolation tests	14 years ago
locale	Remove useless whitespace at end of lines	15 years ago
mb	Minor improvements to mbregress.sh script.	14 years ago
performance	Remove useless whitespace at end of lines	15 years ago
regress	Measure the number of all-visible pages for use in index-only scan costing.	14 years ago
thread	Properly call strerror() in thread test; add comments.	14 years ago
Makefile	Remove cvs keywords from all files.	15 years ago