You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Tom Lane e9986a811c Make gincostestimate() cope with hypothetical GIN indexes. ... We tried to fetch statistics data from the index metapage, which does not work if the index isn't actually present. If the index is hypothetical, instead extrapolate some plausible internal statistics based on the index page count provided by the index-advisor plugin. There was already some code in gincostestimate() to invent internal stats in this way, but since it was only meant as a stopgap for pre-9.1 GIN indexes that hadn't been vacuumed since upgrading, it was pretty crude. If we want it to support index advisors, we should try a little harder. A small amount of testing says that it's better to estimate the entry pages as 90% of the index, not 100%. Also, estimating the number of entries (keys) as equal to the heap tuple count could be wildly wrong in either direction. Instead, let's estimate 100 entries per entry page. Perhaps someday somebody will want the index advisor to be able to provide these numbers more directly, but for the moment this should serve. Problem report and initial patch by Julien Rouhaud; modified by me to invent less-bogus internal statistics. Back-patch to all supported branches, since we've supported index advisors since 9.0.		10 years ago
..
backend	Make gincostestimate() cope with hypothetical GIN indexes.	10 years ago
bin	Further tweaking of print_aligned_vertical().	10 years ago
common	pgindent run for 9.5	11 years ago
include	Avoid caching expression state trees for domain constraints across queries.	10 years ago
interfaces	Use "g" not "f" format in ecpg's PGTYPESnumeric_from_double().	10 years ago
makefiles	Link $(WIN32RES) into single-file modules only when PGFILEDESC is set.	11 years ago
pl	Fix thinko: errmsg -> ereport.	10 years ago
port	Adopt the GNU convention for handling tar-archive members exceeding 8GB.	10 years ago
template	AIX: Test the -qlonglong option before use.	11 years ago
test	Further tweaking of print_aligned_vertical().	10 years ago
timezone	Update time zone data files to tzdata release 2015g.	10 years ago
tools	fix a perl typo	10 years ago
tutorial	Remove no-longer-required function declarations.	11 years ago
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	Back-patch fixes to make TAP tests work on Windows.	10 years ago
Makefile.shlib	AIX: Link TRANSFORM modules with their dependencies.	11 years ago
bcc32.mak	…
nls-global.mk	Setup error context callback for transaction lock waits	12 years ago
win32.mak	…