Merge pull request #4835 from bjester/jit-setting

Conditionalize the JIT setting

Author: rtibbles

contentcuration/contentcuration/signals.py

@@ -1,14 +1,18 @@
+from django.db.backends.postgresql.features import DatabaseFeatures
 from django.db.backends.signals import connection_created
 from django.dispatch import receiver
 
 
 @receiver(connection_created)
 def set_jit(sender, connection, **kwargs):
     """
-    Disable Just-In-Time compilation for PostgreSQL databases, at least until we can
+    Disable Just-In-Time compilation for PostgreSQL databases >= 11, at least until we can
     optimize its use.
     https://www.postgresql.org/docs/12/runtime-config-query.html#GUC-JIT
     """
     if connection.vendor == 'postgresql':
-        with connection.cursor() as cursor:
-            cursor.execute("SET jit = 'off';")
+        db_features = DatabaseFeatures(connection)
+        # JIT is new in v11, and for reference this returns True for v11 and following
+        if db_features.is_postgresql_11:
+            with connection.cursor() as cursor:
+                cursor.execute("SET jit = 'off';")