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The parser is allocating Item_field for references by name in ORDER BY expressions. Such expressions however may point not only to Item_field in the select list (or to a table column) but also to an arbitrary Item. This causes Item_field::fix_fields to throw an error about missing column. The fix substitutes Item_field for the reference with an Item_ref when not pointing to Item_field. mysql-test/r/order_by.result: Bug #22457: Column alias in ORDER BY works, but not if in an expression - test case mysql-test/t/order_by.test: Bug #22457: Column alias in ORDER BY works, but not if in an expression - test case sql/item.cc: Bug #22457: Column alias in ORDER BY works, but not if in an expression - transform the Item_field made by the parser into Item_ref if it doesn't point to Item_field and it is in allowed context
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