diff --git a/tests/queries/0_stateless/01700_deltasum.reference b/tests/queries/0_stateless/01700_deltasum.reference
index 27d687d57d0..d442bc1de2e 100644
--- a/tests/queries/0_stateless/01700_deltasum.reference
+++ b/tests/queries/0_stateless/01700_deltasum.reference
@@ -3,3 +3,5 @@
 7
 7
 7
+5
+5
diff --git a/tests/queries/0_stateless/01700_deltasum.sql b/tests/queries/0_stateless/01700_deltasum.sql
index 6a818ce02d8..a1447cd3c7c 100644
--- a/tests/queries/0_stateless/01700_deltasum.sql
+++ b/tests/queries/0_stateless/01700_deltasum.sql
@@ -3,3 +3,5 @@ select deltaSum(arrayJoin([1, 2, 3, 0, 3, 4]));
 select deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]));
 select deltaSum(arrayJoin([1, 2, 3, 0, 3, 3, 3, 3, 3, 4, 2, 3]));
 select deltaSum(arrayJoin([1, 2, 3, 0, 0, 0, 0, 3, 3, 3, 3, 3, 4, 2, 3]));
+select deltaSumMerge(rows) from (select deltaSumState(arrayJoin([0, 1])) as rows union all select deltaSumState(arrayJoin([4, 5])) as rows);
+select deltaSumMerge(rows) from (select deltaSumState(arrayJoin([4, 5])) as rows union all select deltaSumState(arrayJoin([0, 1])) as rows);