diff --git a/src/Processors/QueryPlan/CreatingSetsStep.cpp b/src/Processors/QueryPlan/CreatingSetsStep.cpp
index f63b657c029..bf2a0aa1929 100644
--- a/src/Processors/QueryPlan/CreatingSetsStep.cpp
+++ b/src/Processors/QueryPlan/CreatingSetsStep.cpp
@@ -121,6 +121,9 @@ void addCreatingSetsStep(
 
     for (auto & [description, set] : subqueries_for_sets)
     {
+        if (!set.source)
+            continue;
+
         auto plan = std::move(set.source);
         std::string type = (set.join != nullptr) ? "JOIN"
                                                  : "subquery";
@@ -139,6 +142,12 @@ void addCreatingSetsStep(
         plans.emplace_back(std::move(plan));
     }
 
+    if (plans.size() == 1)
+    {
+        query_plan = std::move(*plans.front());
+        return;
+    }
+
     auto creating_sets = std::make_unique<CreatingSetsStep>(std::move(input_streams));
     creating_sets->setStepDescription("Create sets before main query execution");
     query_plan.unitePlans(std::move(creating_sets), std::move(plans));