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Tomas Vondra ef3fed2ce4 Fix choose_best_statistics to check clauses individually ... When picking the best extended statistics object for a list of clauses, it's not enough to look at attnums extracted from the clause list as a whole. Consider for example this query with OR clauses: SELECT * FROM t WHERE (t.a = 1) OR (t.b = 1) OR (t.c = 1) with a statistics defined on columns (a,b). Relying on attnums extracted from the whole OR clause, we'd consider the statistics usable. That does not work, as we see the conditions as a single OR-clause, referencing an attribute not covered by the statistic, leading to empty list of clauses to be estimated using the statistics and an assert failure. This changes choose_best_statistics to check which clauses are actually covered, and only using attributes from the fully covered ones. For the previous example this means the statistics object will not be considered as compatible with the OR-clause. Backpatch to 12, where MCVs were introduced. The issue does not affect older versions because functional dependencies don't handle OR clauses. Author: Tomas Vondra Reviewed-by: Dean Rasheed Reported-By: Manuel Rigger Discussion: https://postgr.es/m/CA+u7OA7H5rcE2=8f263w4NZD6ipO_XOrYB816nuLXbmSTH9pQQ@mail.gmail.com Backpatch-through: 12		7 years ago
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backend	Fix choose_best_statistics to check clauses individually	7 years ago
bin	Handle arrays and ranges in pg_upgrade's test for non-upgradable types.	7 years ago
common	In pg_log_generic(), be more paranoid about preserving errno.	7 years ago
fe_utils	Fix parallel restore of FKs to partitioned tables	7 years ago
include	Fix choose_best_statistics to check clauses individually	7 years ago
interfaces	Stamp 12.1.	7 years ago
makefiles	Select CFLAGS_SL at configure time, not in platform-specific Makefiles.	7 years ago
pl	Translation updates	7 years ago
port	Handle ReadFile() EOF correctly on Windows.	7 years ago
template	Select CFLAGS_SL at configure time, not in platform-specific Makefiles.	7 years ago
test	Fix choose_best_statistics to check clauses individually	7 years ago
timezone	Update time zone data files to tzdata release 2019c.	7 years ago
tools	Handle spaces in OpenSSL install location for MSVC	7 years ago
tutorial	Phase 2 pgindent run for v12.	7 years ago
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DEVELOPERS	…
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Makefile.global.in	Select CFLAGS_SL at configure time, not in platform-specific Makefiles.	7 years ago
Makefile.shlib	…
nls-global.mk	NLS: Fix backend gettext triggers	7 years ago