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Added a test case for bug #9338. sql_select.cc: Fixed bug #9338. When an occurence of a field reference has to be replaced by another field reference the whole Item_field must be replaced. item.cc: Fixed bug #9338. The method Item_field::replace_equal_field_processor was replaced by Item_field::replace_equal_field. The new method is used to replace the occurences of Item_field objects. item.h: Fixed bug #9338. The virtual function replace_equal_field_processor was replaced by replace_equal_field. The latter is supposed to be used as a callback function in calls of the method transform. sql/item.h: Fixed bug #9338. The virtual function replace_equal_field_processor was replaced by replace_equal_field. The latter is supposed to be used as a callback function in calls of the method transform. sql/item.cc: The method Item_field::replace_equal_field_processor was replaced by Item_field::replace_equal_field The new method is used to replace the occurences of Item_field objects. sql/sql_select.cc: Fixed bug #9338. When an occurence of a field reference has to be replaced by another field reference the whole Item_field must be replaced. mysql-test/t/subselect.test: Added a test case for bug #9338. mysql-test/r/subselect.result: Added a test case for bug #9338.
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