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MDEV-27229: Estimation for filtered rows less precise ... #5

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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.
This commit is contained in:
Sergei Petrunia
2022-01-11 16:58:51 +03:00
parent d3e511d421
commit db8f15be93
7 changed files with 33 additions and 16 deletions
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sql/opt_histogram_json.h
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@@ -129,7 +129,7 @@ public:
double avg_selection,
double total_rows) override;
double range_selectivity(Field *field, key_range *min_endp,
key_range *max_endp) override;
key_range *max_endp, double avg_sel) override;
void set_json_text(ulonglong sz, const char *json_text_arg,
size_t json_text_len)