fix : Handle split index error in get_column_lineage URN parsing

Author: seyoung4503

data_utils/datahub_source.py

@@ -162,12 +162,21 @@ def get_column_lineage(self, urn):
         result = graph.get_aspect(entity_urn=urn, aspect_type=UpstreamLineageClass)
 
         # downstream dataset (URN 테이블명) 파싱
-        down_dataset = urn.split(",")[1]
-        table_name = down_dataset.split(".")[1]
+        try:
+            down_dataset = urn.split(",")[1]
+            table_name = down_dataset.split(".")[1]
+
+        except IndexError:
+            # URN이 유효하지 않는 경우
+            print(f"[ERROR] Invalid URN format: {urn}")
+            return {}
 
         # upstream_dataset별로 column lineage
         upstream_map = defaultdict(list)
 
+        if not result:
+            return {"downstream_dataset": table_name, "lineage_by_upstream_dataset": []}
+
         for fg in result.fineGrainedLineages or []:
             confidence_score = (
                 fg.confidenceScore if fg.confidenceScore is not None else 1.0