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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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3
mysql-test/r/insert.result
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@ -663,9 +663,10 @@ Warning 1365 Division by 0
Warning 1048 Column 'data' cannot be null
update t1 set data='envelope' where 1/0 or 1;
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 3
info: Rows matched: 2 Changed: 2 Warnings: 4
Warnings:
Warning 1365 Division by 0
Warning 1365 Division by 0
Warning 1265 Data truncated for column 'data' at row 1
Warning 1265 Data truncated for column 'data' at row 2
insert t1 (data) values (default), (1/0), ('dead beef');