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MDEV-9408 CREATE TABLE SELECT MAX(int_column) creates different columns for table vs view There were three almost identical pieces of the code: - Field *Item_func::tmp_table_field(); - Field *Item_sum::create_tmp_field(); - Field *create_tmp_field_from_item(); with a difference in very small details (hence the bugs): Only Item_func::tmp_table_field() was correct, the other two were not. Removing the two incorrect pieces of the redundant code. Joining these three functions/methods into a single virtual method Item::create_tmp_field(). Additionally, moving Item::make_string_field() and Item::tmp_table_field_from_field_type() from the public into the protected section of the class declaration, as they are now not needed outside of Item.
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