diff --git a/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_kernel.cc b/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_kernel.cc
index 028778a72..39a380d24 100644
--- a/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_kernel.cc
+++ b/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_kernel.cc
@@ -482,7 +482,7 @@ static arrow::Status EncodeIndices(std::vector<std::shared_ptr<ArrayItemIndex>>
                                    std::shared_ptr<arrow::Array>* out) {
   arrow::UInt64Builder builder;
   for (const auto& each : in) {
-    uint64_t encoded = ((uint64_t)(each->array_id) << 16U) ^ ((uint64_t)(each->id));
+    uint64_t encoded = ((uint64_t)(each->array_id) << 32U) ^ ((uint64_t)(each->id));
     RETURN_NOT_OK(builder.Append(encoded));
   }
   RETURN_NOT_OK(builder.Finish(out));
@@ -496,7 +496,7 @@ static arrow::Status DecodeIndices(std::shared_ptr<arrow::Array> in,
       std::dynamic_pointer_cast<arrow::UInt64Array>(in);
   for (int i = 0; i < selected->length(); i++) {
     uint64_t encoded = selected->GetView(i);
-    uint16_t array_id = (encoded & 0xFFFF0000U) >> 16U;
+    uint16_t array_id = (encoded & 0xFFFF0000U) >> 32U;
     uint16_t id = encoded & 0xFFFFU;
     v.push_back(std::make_shared<ArrayItemIndex>(array_id, id));
   }
diff --git a/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_sort_kernel.h b/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_sort_kernel.h
index 63b635525..ffc6b83a2 100644
--- a/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_sort_kernel.h
+++ b/native-sql-engine/cpp/src/codegen/arrow_compute/ext/window_sort_kernel.h
@@ -253,7 +253,7 @@ class TypedSorterImpl : public CodeGenBase {
 
     for (int i = 0; i < selected->length(); i++) {
       uint64_t encoded = selected->GetView(i);
-      uint16_t array_id = (encoded & 0xFFFF0000U) >> 16U;
+      uint16_t array_id = (encoded & 0xFFFF0000U) >> 32U;
       uint16_t id = encoded & 0xFFFFU;
       (indices_begin + indices_i)->array_id = array_id;
       (indices_begin + indices_i)->id = id;
@@ -273,7 +273,7 @@ class TypedSorterImpl : public CodeGenBase {
     arrow::UInt64Builder builder;
     auto *index = (ArrayItemIndexS *) indices_out->value_data();
     for (int i = 0; i < indices_out->length(); i++) {
-      uint64_t encoded = ((uint64_t) (index->array_id) << 16U) ^ ((uint64_t) (index->id));
+      uint64_t encoded = ((uint64_t) (index->array_id) << 32U) ^ ((uint64_t) (index->id));
       RETURN_NOT_OK(builder.Append(encoded));
       index++;
     }
@@ -538,7 +538,7 @@ class WindowSortOnekeyKernel : public WindowSortKernel::Impl {
         std::dynamic_pointer_cast<arrow::UInt64Array>(in);
     for (int i = 0; i < selected->length(); i++) {
       uint64_t encoded = selected->GetView(i);
-      uint16_t array_id = (encoded & 0xFFFF0000U) >> 16U;
+      uint16_t array_id = (encoded & 0xFFFF0000U) >> 32U;
       uint16_t id = encoded & 0xFFFFU;
       auto key_clip = cached_key_.at(array_id);
       if (key_clip->IsNull(id)) {
@@ -561,7 +561,7 @@ class WindowSortOnekeyKernel : public WindowSortKernel::Impl {
     // we should also support desc and asc here
     for (int i = 0; i < selected->length(); i++) {
       uint64_t encoded = selected->GetView(i);
-      uint16_t array_id = (encoded & 0xFFFF0000U) >> 16U;
+      uint16_t array_id = (encoded & 0xFFFF0000U) >> 32U;
       uint16_t id = encoded & 0xFFFFU;
       auto key_clip = cached_key_.at(array_id);
       if (nulls_first_) {
@@ -621,7 +621,7 @@ class WindowSortOnekeyKernel : public WindowSortKernel::Impl {
     arrow::UInt64Builder builder;
     auto* index = (ArrayItemIndexS*)indices_out->value_data();
     for (int i = 0; i < indices_out->length(); i++) {
-      uint64_t encoded = ((uint64_t)(index->array_id) << 16U) ^ ((uint64_t)(index->id));
+      uint64_t encoded = ((uint64_t)(index->array_id) << 32U) ^ ((uint64_t)(index->id));
       RETURN_NOT_OK(builder.Append(encoded));
       index++;
     }