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MDEV-4817: Optimizer fails to optimize expression of the form 'FOO' IS NULL

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- Modify the way Item_cond::fix_fields() and Item_cond::eval_not_null_tables() 
  calculate bitmap for Item_cond_or::not_null_tables():
  if they see a "... OR inexpensive_const_false_item OR ..." then the item can
  be ignored.
- Updated test results. There can be more warnings produced since parts of WHERE 
  are evaluated more times.
This commit is contained in:
Sergey Petrunya
2013-07-31 17:24:52 +04:00
parent 6fb1786584
commit 04684b7709
10 changed files with 122 additions and 8 deletions
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mysql-test/r/range.result
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@ -1590,6 +1590,8 @@ NULL
Warnings:
Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date
Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date
Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date
Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date
SELECT str_to_date('2007-10-00', '%Y-%m-%d') BETWEEN '' AND '2007/10/20';
str_to_date('2007-10-00', '%Y-%m-%d') BETWEEN '' AND '2007/10/20'
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