diff --git a/extensions/functions_datetime.yaml b/extensions/functions_datetime.yaml
index 5847c276c..fcbdc8d28 100644
--- a/extensions/functions_datetime.yaml
+++ b/extensions/functions_datetime.yaml
@@ -1080,6 +1080,13 @@ aggregate_functions:
         decomposable: MANY
         intermediate: timestamp?
         return: timestamp?
+      - args:
+          - name: x
+            value: precision_timestamp<P>
+        nullability: DECLARED_OUTPUT
+        decomposable: MANY
+        intermediate: precision_timestamp?<P>
+        return: precision_timestamp?<P>
       - args:
           - name: x
             value: timestamp_tz