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| author | Sergei Petrunia <psergey@askmonty.org> | 2022-01-11 16:58:51 +0300 |
|---|---|---|
| committer | Sergei Petrunia <psergey@askmonty.org> | 2022-01-19 18:10:12 +0300 |
| commit | db8f15be93ff462b738101e7db89bd609455f0fa (patch) | |
| tree | 0e87d401b61b41864ad54b7889146498a18f80a8 /sql/opt_histogram_json.cc | |
| parent | d3e511d42111c23df93cdb1d3b464dcb711cae07 (diff) | |
| download | mariadb-git-db8f15be93ff462b738101e7db89bd609455f0fa.tar.gz | |
MDEV-27229: Estimation for filtered rows less precise ... #5
Followup: remove this line from get_column_range_cardinality()
set_if_bigger(res, col_stats->get_avg_frequency());
and make sure it is only used with the binary histograms.
For JSON histograms, it makes the estimates unnecessarily imprecise.
Diffstat (limited to 'sql/opt_histogram_json.cc')
| -rw-r--r-- | sql/opt_histogram_json.cc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc index 7c037183f41..4305737df1c 100644 --- a/sql/opt_histogram_json.cc +++ b/sql/opt_histogram_json.cc @@ -962,7 +962,7 @@ std::string& Histogram_json_hb::get_end_value(int idx) */ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp, - key_range *max_endp) + key_range *max_endp, double avg_sel) { double min, max; |