fix: Missing processor context when rendering Jinja (#33596)

superset/jinja_context.py

@@ -641,6 +641,12 @@ class BaseTemplateProcessor:
         self._context.update(kwargs)
         self._context.update(context_addons())
 
+    def get_context(self) -> dict[str, Any]:
+        """
+        Returns the current template context.
+        """
+        return self._context.copy()
+
     def process_template(self, sql: str, **kwargs: Any) -> str:
         """Processes a sql template
 

superset/sql_parse.py

@@ -939,12 +939,12 @@ def extract_tables_from_jinja_sql(sql: str, database: Database) -> set[Table]:
             node.data = "NULL"
 
     # re-render template back into a string
-    rendered_template = Template(template).render()
+    rendered_sql = Template(template).render(processor.get_context())
 
     return (
         tables
         | ParsedQuery(
-            sql_statement=processor.process_template(rendered_template),
+            sql_statement=processor.process_template(rendered_sql),
             engine=database.db_engine_spec.engine,
         ).tables
     )