Tom Lane f905d65ee3 Rewrite of planner statistics-gathering code. ANALYZE is now available as ... a separate statement (though it can still be invoked as part of VACUUM, too). pg_statistic redesigned to be more flexible about what statistics are stored. ANALYZE now collects a list of several of the most common values, not just one, plus a histogram (not just the min and max values). Random sampling is used to make the process reasonably fast even on very large tables. The number of values and histogram bins collected is now user-settable via an ALTER TABLE command. There is more still to do; the new stats are not being used everywhere they could be in the planner. But the remaining changes for this project should be localized, and the behavior is already better than before. A not-very-related change is that sorting now makes use of btree comparison routines if it can find one, rather than invoking '<' twice.		2001-05-07 00:43:27 +00:00
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common	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
gist	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
hash	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
heap	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
index	Remove dashes in comments that don't need them, rewrap with pgindent.	2001-03-22 06:16:21 +00:00
nbtree	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
rtree	Rewrite of planner statistics-gathering code. ANALYZE is now available as	2001-05-07 00:43:27 +00:00
transam	Seems like we should not hold off cancel/die interrupts while we are	2001-05-04 18:39:16 +00:00
Makefile	Fix relative path references so that make knowns which dependencies refer	2000-08-31 16:12:35 +00:00