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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2025-05-18 23:49:50 +0300 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2025-05-18 23:49:50 +0300 |
| commit | 3d3a81fc24b07f04df81d898f6b4e85c553ef604 (patch) | |
| tree | 80df4269d9ed7c2655ca8fa2953ac2147500ba49 /src/backend/parser/parser.c | |
| parent | 12eee85e511ff8854ac61e8caad8cec218b20513 (diff) | |
| download | postgresql-3d3a81fc24b07f04df81d898f6b4e85c553ef604.tar.gz postgresql-3d3a81fc24b07f04df81d898f6b4e85c553ef604.zip | |
Fix tuple_fraction calculation in generate_orderedappend_paths()
6b94e7a6da adjusted generate_orderedappend_paths() to consider fractional
paths. However, it didn't manage to interpret the tuple_fraction value
correctly. According to the header comment of grouping_planner(), the
tuple_fraction >= 1 specifies the absolute number of expected tuples. That
number must be divided by the expected total number of tuples to get the
actual fraction.
Even though this is a bug fix, we don't backpatch it. The risks of the side
effects of plan changes on stable branches are too high.
Reported-by: Andrei Lepikhov <lepihov@gmail.com>
Discussion: https://postgr.es/m/3ca271fa-ca5c-458c-8934-eb148622b270%40gmail.com
Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Junwang Zhao <zhjwpku@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Diffstat (limited to 'src/backend/parser/parser.c')
0 files changed, 0 insertions, 0 deletions