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mariadb/mysql-test/t
Sergey Petrunya 04684b7709 MDEV-4817: Optimizer fails to optimize expression of the form 'FOO' IS NULL
- 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.
2013-07-31 17:24:52 +04:00
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