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MDEV-5926, MDEV-4362 post-fixes:

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- Histogram::find_bucket() should not walk off the end of the value range.
- Address review feedback in Histogram::point_selectivity(): different handling
  for zero-width buckets, and explanations.
This commit is contained in:
Sergey Petrunya
2014-03-27 12:30:49 +04:00
parent dee11f9633
commit ab061a2bb3
3 changed files with 45 additions and 23 deletions
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2
mysql-test/r/selectivity_innodb.result
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@ -1388,7 +1388,7 @@ Note 1003 select `test`.`t1`.`col1` AS `col1` from `test`.`t1` where (`test`.`t1
# Must not cause fp division by zero, or produce nonsense numbers:
explain extended select * from t1 where col1 in (-1,-2,-3);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 10000 3.00 Using where
1 SIMPLE t1 ALL NULL NULL NULL NULL 10000 5.94 Using where
Warnings:
Note 1003 select `test`.`t1`.`col1` AS `col1` from `test`.`t1` where (`test`.`t1`.`col1` in (<cache>(-(1)),<cache>(-(2)),<cache>(-(3))))
explain extended select * from t1 where col1<=-1;