diff options
| author | Tomas Vondra <tomas.vondra@postgresql.org> | 2020-04-23 00:15:24 +0200 |
|---|---|---|
| committer | Tomas Vondra <tomas.vondra@postgresql.org> | 2020-04-23 00:15:24 +0200 |
| commit | de0dc1a84710f127fdd40f87e783797cc2d69a77 (patch) | |
| tree | a7295ae3bb4cb2a3a387a56ecca784c73019b295 /src/backend/access/transam/commit_ts.c | |
| parent | 92c12e46d5f1e25fc85608a6d6a19b8f5ea02600 (diff) | |
| download | postgresql-de0dc1a84710f127fdd40f87e783797cc2d69a77.tar.gz postgresql-de0dc1a84710f127fdd40f87e783797cc2d69a77.zip | |
Fix cost_incremental_sort for expressions with varno 0
When estimating the number of pre-sorted groups in cost_incremental_sort
we must not pass Vars with varno 0 to estimate_num_groups, which would
cause failues in find_base_rel. This may happen when sorting output of
set operations, thanks to generate_append_tlist.
Unlike recurse_set_operations we can't easily access the original target
list, so if we find any Vars with varno 0, we fall back to the default
estimate DEFAULT_NUM_DISTINCT.
Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/20200411214639.GK2228%40telsasoft.com
Diffstat (limited to 'src/backend/access/transam/commit_ts.c')
0 files changed, 0 insertions, 0 deletions