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| author | David Rowley <drowley@postgresql.org> | 2024-01-31 17:22:02 +1300 |
|---|---|---|
| committer | David Rowley <drowley@postgresql.org> | 2024-01-31 17:22:02 +1300 |
| commit | b588cad688823b1e996ce05af4d88a954c005a3a (patch) | |
| tree | 41ec222b7f8ad9ca83b80bd9be18e8815608fc60 /src/backend/access/transam/xlogutils.c | |
| parent | 3e91dba8b079c02dc5204108c7e797b402c75779 (diff) | |
| download | postgresql-b588cad688823b1e996ce05af4d88a954c005a3a.tar.gz postgresql-b588cad688823b1e996ce05af4d88a954c005a3a.zip | |
Consider the "LIMIT 1" optimization with parallel DISTINCT
Similar to what was done in 5543677ec for non-parallel DISTINCT, apply
the same optimization when the distinct_pathkeys are empty for the
partial paths too.
This can be faster than the non-parallel version when the first row
matching the WHERE clause of the query takes a while to find. Parallel
workers could speed that process up considerably.
Author: Richard Guo
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/CAMbWs49JC0qvfUbzs-TVzgMpSSBiMJ_6sN=BaA9iohBgYkr=LA@mail.gmail.com
Diffstat (limited to 'src/backend/access/transam/xlogutils.c')
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