Fix UnboundLocalError when sql is empty list in DatabricksSqlHook (#2…

…3815)
apache · May 22, 2022 · cf5a78e · cf5a78e
1 parent 4b5a101
commit cf5a78e
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/airflow/providers/databricks/hooks/databricks_sql.py b/airflow/providers/databricks/hooks/databricks_sql.py
@@ -167,7 +167,11 @@ def run(self, sql: Union[str, List[str]], autocommit=True, parameters=None, hand
         """
         if isinstance(sql, str):
             sql = self.maybe_split_sql_string(sql)
-        self.log.debug("Executing %d statements", len(sql))
+
+        if sql:
+            self.log.debug("Executing %d statements", len(sql))
+        else:
+            raise ValueError("List of SQL statements is empty")
 
         conn = None
         for sql_statement in sql:

diff --git a/tests/providers/databricks/hooks/test_databricks_sql.py b/tests/providers/databricks/hooks/test_databricks_sql.py
@@ -20,6 +20,8 @@
 import unittest
 from unittest import mock
 
+import pytest
+
 from airflow.models import Connection
 from airflow.providers.databricks.hooks.databricks_sql import DatabricksSqlHook
 from airflow.utils.session import provide_session
@@ -82,3 +84,9 @@ def test_query(self, mock_requests, mock_conn):
 
         cur.execute.assert_has_calls([mock.call(q) for q in [query]])
         cur.close.assert_called()
+
+    def test_no_query(self):
+        for empty_statement in ([], '', '\n'):
+            with pytest.raises(ValueError) as err:
+                self.hook.run(sql=empty_statement)
+            assert err.value.args[0] == "List of SQL statements is empty"