Fix for BUG#13127.
The problem was in the way table references are pre-filtered when resolving a qualified field. When resolving qualified table references we search recursively in the operands of the join. If there is natural/using join with a merge view, the first call to find_field_in_table_ref makes a recursive call to itself with the view as the new table reference to search for the column. However the view has both nested_join and join_columns != NULL so it skipped the test whether the view name matches the field qualifier. As a result the field was found in the view since the view already has a field with the same name. Thus the field was incorrectly resolved as the view field. mysql-test/r/select.result: Test for BUG#13127. mysql-test/t/select.test: Test for BUG#13127. sql/sql_base.cc: The patch contains two independent changes: - When searching for qualified fields, include merge views and information schema tables used with SHOW (both using TABLE_LIST::field_translation to represent result fields) in the test that compares the qualifying table with the name of the table reference being searched. This change fixes the bug. - Do not search the materialized list of columns of a NATURAL/USING join if 'table_list' is a stored table or merge view. Instead search directly in the table or view as if it is not under a natural join. This is a performance improvement since if 'table_list' is a stored table, then the search can utilize the name hash for table names.
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