diff --git a/sql_metadata/parser.py b/sql_metadata/parser.py
index 5c61dca8..2da34318 100644
--- a/sql_metadata/parser.py
+++ b/sql_metadata/parser.py
@@ -836,7 +836,8 @@ def _resolve_nested_query(  # noqa: C901
             return [resolved_column]
 
         if column_name == "*":
-            return subparser.columns
+            # return subparser.columns
+            return list(set(item for sublist in subparser.columns_dict['select'] for item in (sublist if isinstance(sublist, list) else [sublist])))
         try:
             column_index = [x.split(".")[-1] for x in subparser.columns].index(
                 column_name