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MDEV-26886: Estimation for filtered rows less precise with JSON histogram

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- Make Histogram_json_hb::range_selectivity handle singleton buckets
  specially when computing selectivity of the max. endpoint bound.
  (for min. endpoint, we already do that).

- Also, fixed comments for Histogram_json_hb::find_bucket
This commit is contained in:
Sergei Petrunia
2021-11-26 20:03:08 +03:00
parent 106c785e2d
commit eb6a9ad705
4 changed files with 84 additions and 29 deletions
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sql/opt_histogram_json.h
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@@ -124,6 +124,6 @@ public:
private:
double get_left_fract(int idx);
std::string& get_end_value(int idx);
int find_bucket(Field *field, const uchar *lookup_val, bool *equal);
int find_bucket(const Field *field, const uchar *lookup_val, bool *equal);
};