diff --git a/be/src/vec/aggregate_functions/aggregate_function_collect.h b/be/src/vec/aggregate_functions/aggregate_function_collect.h
index 68de426ea1fdcf..7a475b345ee39d 100644
--- a/be/src/vec/aggregate_functions/aggregate_function_collect.h
+++ b/be/src/vec/aggregate_functions/aggregate_function_collect.h
@@ -258,10 +258,10 @@ struct AggregateFunctionCollectListData<StringRef, HasLimit> {
             }
             max_size = rhs.max_size;
 
-            data->insert_range_from(
-                    *rhs.data, 0,
-                    std::min(assert_cast<size_t, TypeCheckOnRelease::DISABLE>(max_size - size()),
-                             rhs.size()));
+            data->insert_range_from(*rhs.data, 0,
+                                    std::min(assert_cast<size_t, TypeCheckOnRelease::DISABLE>(
+                                                     static_cast<size_t>(max_size - size())),
+                                             rhs.size()));
         } else {
             data->insert_range_from(*rhs.data, 0, rhs.size());
         }
diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java b/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
index 6c94be89c91faa..94fb92812962ca 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
@@ -1814,7 +1814,8 @@ protected void computeFragmentHosts() throws Exception {
                     exchangeInstances = ConnectContext.get().getSessionVariable().getExchangeInstanceParallel();
                 }
                 // when we use nested loop join do right outer / semi / anti join, the instance must be 1.
-                if (leftMostNode.getNumInstances() == 1) {
+                boolean isNereids = context != null && context.getState().isNereids();
+                if (!isNereids && leftMostNode.getNumInstances() == 1) {
                     exchangeInstances = 1;
                 }
                 // Using serial source means a serial source operator will be used in this fragment (e.g. data will be