diff --git a/be/src/vec/functions/function_bit_count.cpp b/be/src/vec/functions/function_bit_count.cpp
index 14ea83f2c32fdab..d4d9306a7c58bba 100644
--- a/be/src/vec/functions/function_bit_count.cpp
+++ b/be/src/vec/functions/function_bit_count.cpp
@@ -44,7 +44,7 @@ struct BitCountImpl {
                       std::is_same_v<T, Int32> || std::is_same_v<T, Int16> ||
                       std::is_same_v<T, Int8>) {
             // ResultType already check the length
-            return cast_set<ResultType, false>(
+            return cast_set<ResultType, int, false>(
                     std::popcount(static_cast<std::make_unsigned_t<T>>(a)));
         } else {
             throw Exception(ErrorCode::INVALID_ARGUMENT,
diff --git a/be/src/vec/functions/function_case.h b/be/src/vec/functions/function_case.h
index a579f6596a845a0..97de565b90ca56b 100644
--- a/be/src/vec/functions/function_case.h
+++ b/be/src/vec/functions/function_case.h
@@ -157,7 +157,7 @@ class FunctionCase : public IFunction {
     Status execute_short_circuit(const DataTypePtr& data_type, Block& block, uint32_t result,
                                  CaseWhenColumnHolder column_holder) const {
         auto case_column_ptr = column_holder.when_ptrs[0].value_or(nullptr);
-        int rows_count = column_holder.rows_count;
+        size_t rows_count = column_holder.rows_count;
 
         // `then` data index corresponding to each row of results, 0 represents `else`.
         auto then_idx_uptr = std::unique_ptr<int[]>(new int[rows_count]);
@@ -204,7 +204,7 @@ class FunctionCase : public IFunction {
                                                                            column_holder);
         }
 
-        int rows_count = column_holder.rows_count;
+        size_t rows_count = column_holder.rows_count;
 
         // `then` data index corresponding to each row of results, 0 represents `else`.
         auto then_idx_uptr = std::unique_ptr<uint8_t[]>(new uint8_t[rows_count]);