diff --git a/regression-test/suites/nereids_rules_p0/unique_function/push_down_filter_through_set_operation_with_unique_function.groovy b/regression-test/suites/nereids_rules_p0/unique_function/push_down_filter_through_set_operation_with_unique_function.groovy
index c58c87e7e635a7..d3fc9cf40fe4f5 100644
--- a/regression-test/suites/nereids_rules_p0/unique_function/push_down_filter_through_set_operation_with_unique_function.groovy
+++ b/regression-test/suites/nereids_rules_p0/unique_function/push_down_filter_through_set_operation_with_unique_function.groovy
@@ -19,6 +19,7 @@ suite('push_down_filter_through_set_operation_with_unique_function') {
     sql 'SET enable_nereids_planner=true'
     sql 'SET runtime_filter_mode=OFF'
     sql 'SET enable_fallback_to_original_planner=false'
+    sql 'SET parallel_pipeline_task_num=2'
     sql "SET ignore_shape_nodes='PhysicalDistribute'"
     sql "SET detail_shape_nodes='PhysicalProject'"
     sql 'SET disable_nereids_rules=PRUNE_EMPTY_PARTITION'