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Peter Geoghegan 49eb96852b Avoid CREATE INDEX unique index deduplication. 
There is no advantage to attempting deduplication for a unique index
during CREATE INDEX, since there cannot possibly be any duplicates.
Doing so wastes cycles due to unnecessary copying.  Make sure that we
avoid it consistently.

We already avoided unique index deduplication in the case where there
were some spool2 tuples to merge.  That didn't account for the fact that
spool2 is removed early/unset in the common case where it has no tuples
that need to be merged (i.e. it failed to account for the "spool2 turns
out to be unnecessary" optimization in _bt_spools_heapscan()).

Oversight in commit 0d861bbb, which added nbtree deduplication

Backpatch: 13-, where nbtree deduplication was introduced.
2020-07-17 09:50:46 -07:00
..
backend Avoid CREATE INDEX unique index deduplication. 2020-07-17 09:50:46 -07:00
bin Switch pg_test_fsync to use binary mode on Windows 2020-07-16 15:52:54 +09:00
common Move frontend-side archive APIs from src/common/ to src/fe_utils/ 2020-06-11 15:48:56 +09:00
fe_utils Move frontend-side archive APIs from src/common/ to src/fe_utils/ 2020-06-11 15:48:56 +09:00
include Fix comments related to table AMs 2020-07-14 13:17:31 +09:00
interfaces Fix bugs in libpq's management of GSS encryption state. 2020-07-13 11:58:09 -04:00
makefiles Remove libpq.rc, use win32ver.rc for libpq 2020-01-15 15:06:12 +01:00
pl Translation updates 2020-06-22 14:08:30 +02:00
port Clear some style deviations. 2020-05-21 08:31:16 -07:00
template Fix compiler warning for ppoll() on Cygwin 2019-12-22 23:20:00 +01:00
test Fix bitmap AND/OR scans on the inside of a nestloop partition-wise join. 2020-07-14 18:56:49 -04:00
timezone Ensure that distributed timezone abbreviation files are plain ASCII. 2020-07-17 11:04:22 -04:00
tools Improve vacuum error context handling. 2020-07-01 08:06:00 +05:30
tutorial Update copyrights for 2020 2020-01-01 12:21:45 -05:00
.gitignore
DEVELOPERS
Makefile Fix partial-build problems introduced by having more generated headers. 2018-04-09 16:42:10 -04:00
Makefile.global.in Update Unicode data to Unicode 13.0.0 and CLDR 37 2020-04-24 09:52:59 +02:00
Makefile.shlib Add PostgreSQL home page to --help output 2020-02-28 13:12:21 +01:00
nls-global.mk NLS: Fix backend gettext triggers 2019-09-23 09:04:20 +02:00