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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.		25 years ago
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access	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
bootstrap	Remove dashes in comments that don't need them, rewrap with pgindent.	25 years ago
catalog	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
commands	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
executor	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
lib	Remove dashes in comments that don't need them, rewrap with pgindent.	25 years ago
libpq	Remove error report from pq_endmessage when pq_putmessage fails. The	25 years ago
main	Remove useless setuid() call, instead add a check that real and effective	25 years ago
nodes	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
optimizer	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
parser	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
port	Tom Ivar Helbekkmo <tih@kpnQwest.no> says that dynamic linking works	25 years ago
postmaster	Add extern int optreset declaration, per bug report from <info@decc.nl>.	25 years ago
regex	pgindent run. Make it all clean.	25 years ago
rewrite	Permission checking wasn't quite right for insert/update/delete rules,	25 years ago
storage	Check for failure of malloc() and realloc() when allocating space for	25 years ago
tcop	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
tioga	Remove dashes in comments that don't need them, rewrap with pgindent.	25 years ago
utils	Rewrite of planner statistics-gathering code. ANALYZE is now available as	25 years ago
Makefile	Send 'cd' output to /dev/null.	25 years ago