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| author | Richard Guo <rguo@postgresql.org> | 2025-11-05 18:10:54 +0900 |
|---|---|---|
| committer | Richard Guo <rguo@postgresql.org> | 2025-11-05 18:10:54 +0900 |
| commit | 0ea5eee37606386150aa8317184617e1d5d34565 (patch) | |
| tree | 4a4a11595db2e554055c55ab104729a6e926ef68 /src/tutorial/complex.c | |
| parent | c1777f2d6d43adf9bc65da3e44a3a5ad2cbfa86d (diff) | |
Avoid creating duplicate ordered append paths
In generate_orderedappend_paths(), the function does not handle the
case where the paths in total_subpaths and fractional_subpaths are
identical. This situation is not uncommon, and as a result, it may
generate two exactly identical ordered append paths.
Fix by checking whether total_subpaths and fractional_subpaths contain
the same paths, and skipping creation of the ordered append path for
the fractional case when they are identical.
Given the lack of field complaints about this, I'm a bit hesitant to
back-patch, but let's clean it up in HEAD.
Author: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Discussion: https://postgr.es/m/CAMbWs4-OYsgA75tGGiBARt87G0y_z_GBTSLrzudcJxAzndYkYw@mail.gmail.com
Diffstat (limited to 'src/tutorial/complex.c')
0 files changed, 0 insertions, 0 deletions