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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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6
mysql-test/main/statistics_json.test
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@ -409,9 +409,9 @@ analyze select COUNT(*) FROM t1 WHERE a > 'bar';
analyze select COUNT(*) FROM t1 WHERE a >='bar';
# Can enable these after get_avg_frequency issue is resolved:
# analyze select COUNT(*) FROM t1 WHERE a < 'aaa';
# analyze select COUNT(*) FROM t1 WHERE a <='aaa';
# analyze select COUNT(*) FROM t1 WHERE a < 'bar';
analyze select COUNT(*) FROM t1 WHERE a < 'aaa';
analyze select COUNT(*) FROM t1 WHERE a <='aaa';
analyze select COUNT(*) FROM t1 WHERE a < 'bar';
analyze select COUNT(*) FROM t1 WHERE a <='bar';