fix(sqllab): template validation error within comments (apache#25626)

superset/sqllab/query_render.py

@@ -25,6 +25,7 @@
 
 from superset import is_feature_enabled
 from superset.errors import SupersetErrorType
+from superset.sql_parse import ParsedQuery
 from superset.sqllab.commands.execute import SqlQueryRender
 from superset.sqllab.exceptions import SqlLabException
 from superset.utils import core as utils
@@ -57,8 +58,9 @@ def render(self, execution_context: SqlJsonExecutionContext) -> str:
                 database=query_model.database, query=query_model
             )
 
+            parsed_query = ParsedQuery(query_model.sql, strip_comments=True)
             rendered_query = sql_template_processor.process_template(
-                query_model.sql, **execution_context.template_params
+                parsed_query.stripped(), **execution_context.template_params
             )
             self._validate(execution_context, rendered_query, sql_template_processor)
             return rendered_query

tests/integration_tests/sqllab_tests.py

@@ -514,6 +514,13 @@ def test_sql_json_parameter_error(self):
         )
         assert data["status"] == "success"
 
+        data = self.run_sql(
+            "SELECT * FROM birth_names WHERE state = '{{ state }}' -- blabblah {{ extra1 }} {{fake.fn()}}\nLIMIT 10",
+            "3",
+            template_params=json.dumps({"state": "CA"}),
+        )
+        assert data["status"] == "success"
+
         data = self.run_sql(
             "SELECT * FROM birth_names WHERE state = '{{ stat }}' LIMIT 10",
             "2",