fix(ingest/bigquery): Filter out fine grained lineage with no upstreams (#8758)

metadata-ingestion/src/datahub/ingestion/source/bigquery_v2/lineage.py

@@ -183,6 +183,7 @@ def make_lineage_edges_from_parsing_result(
             column_mapping=frozenset(
                 LineageEdgeColumnMapping(out_column=out_column, in_columns=in_columns)
                 for out_column, in_columns in column_mapping.items()
+                if in_columns
             ),
             auditStamp=audit_stamp,
             type=lineage_type,

metadata-ingestion/tests/unit/test_bigquery_lineage.py

@@ -1,6 +1,8 @@
 import datetime
 from typing import Dict, List, Set
 
+import pytest
+
 from datahub.ingestion.source.bigquery_v2.bigquery_audit import (
     BigQueryTableRef,
     QueryEvent,
@@ -14,15 +16,17 @@ from datahub.ingestion.source.bigquery_v2.lineage import (
 from datahub.utilities.sqlglot_lineage import SchemaResolver
 
 
-def test_lineage_with_timestamps():
+@pytest.fixture
-    config = BigQueryV2Config()
+def lineage_entries() -> List[QueryEvent]:
-    report = BigQueryV2Report()
+    return [
-    extractor: BigqueryLineageExtractor = BigqueryLineageExtractor(config, report)
-    lineage_entries: List[QueryEvent] = [
         QueryEvent(
             timestamp=datetime.datetime.now(tz=datetime.timezone.utc),
             actor_email="bla@bla.com",
-            query="testQuery",
+            query="""
+                INSERT INTO `my_project.my_dataset.my_table`
+                SELECT first.a, second.b FROM `my_project.my_dataset.my_source_table1` first
+                LEFT JOIN `my_project.my_dataset.my_source_table2` second ON first.id = second.id
+            """,
             statementType="SELECT",
             project_id="proj_12344",
             end_time=None,
@@ -73,6 +77,12 @@ def test_lineage_with_timestamps():
         ),
     ]
 
+
+def test_lineage_with_timestamps(lineage_entries: List[QueryEvent]) -> None:
+    config = BigQueryV2Config()
+    report = BigQueryV2Report()
+    extractor: BigqueryLineageExtractor = BigqueryLineageExtractor(config, report)
+
     bq_table = BigQueryTableRef.from_string_name(
         "projects/my_project/datasets/my_dataset/tables/my_table"
     )
@@ -90,3 +100,31 @@ def test_lineage_with_timestamps():
     )
     assert upstream_lineage
     assert len(upstream_lineage.upstreams) == 4
+
+
+def test_column_level_lineage(lineage_entries: List[QueryEvent]) -> None:
+    config = BigQueryV2Config(extract_column_lineage=True, incremental_lineage=False)
+    report = BigQueryV2Report()
+    extractor: BigqueryLineageExtractor = BigqueryLineageExtractor(config, report)
+
+    bq_table = BigQueryTableRef.from_string_name(
+        "projects/my_project/datasets/my_dataset/tables/my_table"
+    )
+
+    lineage_map: Dict[str, Set[LineageEdge]] = extractor._create_lineage_map(
+        lineage_entries[:1],
+        sql_parser_schema_resolver=SchemaResolver(platform="bigquery"),
+    )
+
+    upstream_lineage = extractor.get_lineage_for_table(
+        bq_table=bq_table,
+        bq_table_urn="urn:li:dataset:(urn:li:dataPlatform:bigquery,my_project.my_dataset.my_table,PROD)",
+        lineage_metadata=lineage_map,
+        platform="bigquery",
+    )
+    assert upstream_lineage
+    assert len(upstream_lineage.upstreams) == 2
+    assert (
+        upstream_lineage.fineGrainedLineages
+        and len(upstream_lineage.fineGrainedLineages) == 2
+    )