MDEV-26519: JSON Histograms: improve histogram collection

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Basic ideas:
1. Store "popular" values in their own buckets.
2. Also store ndv (Number of Distinct Values) in each bucket.

Because of #1, the buckets are now variable-size, so store the size in
each bucket.

Adjust selectivity estimation functions accordingly.

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This commit is contained in:

Sergei Petrunia

2021-09-10 10:45:04 +03:00

parent d64e104810

commit f460272054

3 changed files with 5722 additions and 1318 deletions

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mysql-test/main/statistics_json.result

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