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Alexander Korotkov e983ee9380 Improve statistics estimation for single-column GROUP BY in sub-queries 
This commit follows the idea of the 4767bc8ff2.  If sub-query has only one
GROUP BY column, we can consider its output variable as being unique. We can
employ this fact in the statistics to make more precise estimations in the
upper query block.

Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
2025-02-19 11:59:30 +02:00
..
backend Improve statistics estimation for single-column GROUP BY in sub-queries 2025-02-19 11:59:30 +02:00
bin Invalidate inactive replication slots. 2025-02-19 09:29:50 +05:30
common Add pg_encoding_set_invalid() 2025-02-10 10:03:37 -05:00
fe_utils In fmtIdEnc(), handle failure of enlargePQExpBuffer(). 2025-02-16 12:46:35 -05:00
include Improve statistics estimation for single-column GROUP BY in sub-queries 2025-02-19 11:59:30 +02:00
interfaces Make escaping functions retain trailing bytes of an invalid character. 2025-02-15 16:20:21 -05:00
makefiles Update copyright for 2025 2025-01-01 11:21:55 -05:00
pl Allow extension functions to participate in in-place updates. 2025-02-11 12:49:34 -05:00
port Avoid breaking SJIS encoding while de-backslashing Windows paths. 2025-01-29 14:24:36 -05:00
template thread-safety: gmtime_r(), localtime_r() 2024-08-23 07:43:04 +02:00
test Improve statistics estimation for single-column GROUP BY in sub-queries 2025-02-19 11:59:30 +02:00
timezone Update time zone data files to tzdata release 2025a. 2025-01-20 16:49:15 -05:00
tools Invalidate inactive replication slots. 2025-02-19 09:29:50 +05:30
tutorial Doc: simplify the tutorial's window-function examples. 2025-01-21 14:43:21 -05:00
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Makefile Remove distprep 2023-11-06 15:18:04 +01:00
Makefile.global.in Convert sepgsql tests to TAP 2025-01-24 12:39:47 +01:00
Makefile.shlib Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Update copyright for 2025 2025-01-01 11:21:55 -05:00
nls-global.mk Remove distprep 2023-11-06 15:18:04 +01:00