bin/map: by_col: Stripping XML functions not in the DB: Fixed bug where preserve_funcs.add() was used when `preserve_funcs |=` should have been used to add the entire iterable that sql.tables() returns
bin/map: by_col: Stripping XML functions not in the DB: Fixed bug where preserve_funcs.add() was used when `preserve_funcs |=` should have been used to add the entire iterable that sql.tables() returns