diff --git a/src/jogasaki/executor/process/flow.cpp b/src/jogasaki/executor/process/flow.cpp
index f2cfcd14..a1abcbf0 100644
--- a/src/jogasaki/executor/process/flow.cpp
+++ b/src/jogasaki/executor/process/flow.cpp
@@ -106,6 +106,10 @@ sequence_view<std::shared_ptr<model::task>> flow::create_tasks() {
     std::vector<std::shared_ptr<abstract::task_context>> contexts{};
     auto partitions = check_empty_input_and_calculate_partitions();
     auto& operators = proc->operators();
+    const auto& scan_ranges = operators.scan_ranges();
+    if (!scan_ranges.empty()){
+        partitions = scan_ranges.size();
+    }
     auto external_output = operators.io_exchange_map().external_output();
     auto ch = context_->record_channel();
     if (ch && external_output != nullptr) {
@@ -124,8 +128,10 @@ sequence_view<std::shared_ptr<model::task>> flow::create_tasks() {
     }
 
     contexts.reserve(partitions);
-    for (std::size_t i=0; i < partitions; ++i) {
-        contexts.emplace_back(create_task_context(i, operators, sink_idx_base + i, operators.range()));
+
+    for (std::size_t i = 0; i < partitions; ++i) {
+        contexts.emplace_back(create_task_context(
+            i, operators, sink_idx_base + i, scan_ranges.empty() ? nullptr : scan_ranges[i]));
     }
 
     bool is_rtx = context_->transaction()->option()->type()
diff --git a/src/jogasaki/executor/process/impl/ops/operator_builder.cpp b/src/jogasaki/executor/process/impl/ops/operator_builder.cpp
index dc0d0f07..0511bcb8 100644
--- a/src/jogasaki/executor/process/impl/ops/operator_builder.cpp
+++ b/src/jogasaki/executor/process/impl/ops/operator_builder.cpp
@@ -93,7 +93,7 @@ operator_builder::operator_builder(
 
 operator_container operator_builder::operator()()&& {
     auto root = dispatch(*this, head());
-    return operator_container{std::move(root), index_, *io_exchange_map_, std::move(range_)};
+    return operator_container{std::move(root), index_, *io_exchange_map_, std::move(scan_ranges_)};
 }
 
 relation::expression const& operator_builder::head() {
@@ -132,7 +132,7 @@ std::unique_ptr<operator_base> operator_builder::operator()(const relation::scan
     auto& secondary_or_primary_index = yugawara::binding::extract<yugawara::storage::index>(node.source());
     auto& table = secondary_or_primary_index.table();
     auto primary = table.owner()->find_primary_index(table);
-    range_ = create_range(node);
+    scan_ranges_ = create_scan_ranges(node);
     return std::make_unique<scan>(
         index_++,
         *info_,
@@ -374,7 +374,9 @@ std::unique_ptr<operator_base> operator_builder::operator()(const relation::step
 }
 
 
-std::shared_ptr<impl::scan_range> operator_builder::create_range(relation::scan const& node) {
+std::vector<std::shared_ptr<impl::scan_range>> operator_builder::create_scan_ranges(
+    relation::scan const& node) {
+    std::vector<std::shared_ptr<impl::scan_range>> scan_ranges{};
     auto& secondary_or_primary_index =
         yugawara::binding::extract<yugawara::storage::index>(node.source());
     executor::process::impl::variable_table vars{};
@@ -401,7 +403,15 @@ std::shared_ptr<impl::scan_range> operator_builder::create_range(relation::scan
     bound begin(begin_end_point_kind, blen, std::move(key_begin));
     bound end(end_end_point_kind, elen, std::move(key_end));
     bool is_empty = (status_result == status::err_integrity_constraint_violation);
-    return std::make_shared<impl::scan_range>(std::move(begin), std::move(end), is_empty);
+
+    std::vector<bound> bounds;
+    bounds.emplace_back(std::move(begin));
+    bounds.emplace_back(std::move(end));
+    for (size_t i = 0; i + 1 < bounds.size(); i += 2) {
+        scan_ranges.emplace_back(std::make_shared<impl::scan_range>(
+            std::move(bounds[i]), std::move(bounds[i + 1]), is_empty));
+    }
+    return scan_ranges;
 }
 
 operator_container create_operators(
diff --git a/src/jogasaki/executor/process/impl/ops/operator_builder.h b/src/jogasaki/executor/process/impl/ops/operator_builder.h
index 0c9c6889..2b2e0058 100644
--- a/src/jogasaki/executor/process/impl/ops/operator_builder.h
+++ b/src/jogasaki/executor/process/impl/ops/operator_builder.h
@@ -122,15 +122,14 @@ class operator_builder {
     using key = yugawara::storage::index::key;
     using endpoint = takatori::relation::scan::endpoint;
 
-    std::shared_ptr<impl::scan_range> create_range(relation::scan const& node);
-
+    std::vector<std::shared_ptr<impl::scan_range>> create_scan_ranges(relation::scan const& node);
   private:
     std::shared_ptr<processor_info> info_{};
     std::shared_ptr<io_info> io_info_{};
     io_exchange_map* io_exchange_map_{};
     std::shared_ptr<relation_io_map> relation_io_map_{};
     operator_base::operator_index_type index_{};
-    std::shared_ptr<impl::scan_range> range_{};
+    std::vector<std::shared_ptr<impl::scan_range>> scan_ranges_{};
     request_context* request_context_{};
 
 };
diff --git a/src/jogasaki/executor/process/impl/ops/operator_container.cpp b/src/jogasaki/executor/process/impl/ops/operator_container.cpp
index dc739e15..68d22c59 100644
--- a/src/jogasaki/executor/process/impl/ops/operator_container.cpp
+++ b/src/jogasaki/executor/process/impl/ops/operator_container.cpp
@@ -24,13 +24,12 @@ namespace jogasaki::executor::process::impl::ops {
 
 
 operator_container::operator_container(std::unique_ptr<ops::operator_base> root, std::size_t operator_count,
-    class io_exchange_map& io_exchange_map, std::shared_ptr<impl::scan_range> range) :
+    class io_exchange_map& io_exchange_map, std::vector<std::shared_ptr<impl::scan_range>> scan_ranges) :
     root_(std::move(root)),
     operator_count_(operator_count),
     io_exchange_map_(std::addressof(io_exchange_map)),
-    range_(std::move(range))
+    scan_ranges_(std::move(scan_ranges))
 {}
-
 std::size_t operator_container::size() const noexcept {
     return operator_count_;
 }
@@ -43,7 +42,7 @@ operator_base& operator_container::root() const noexcept {
     return *root_;
 }
 
-std::shared_ptr<impl::scan_range> const& operator_container::range() const noexcept {
-    return range_;
+std::vector<std::shared_ptr<impl::scan_range>> operator_container::scan_ranges() const noexcept {
+    return scan_ranges_;
 }
 } // namespace jogasaki::executor::process::impl::ops
diff --git a/src/jogasaki/executor/process/impl/ops/operator_container.h b/src/jogasaki/executor/process/impl/ops/operator_container.h
index fc6027e7..3a5b6d91 100644
--- a/src/jogasaki/executor/process/impl/ops/operator_container.h
+++ b/src/jogasaki/executor/process/impl/ops/operator_container.h
@@ -39,14 +39,14 @@ class operator_container {
      * @param root the root of the operator tree
      * @param operator_count the number of operators
      * @param io_exchange_map the mapping from input/output index to exchange
-     * @param range the range gathered from the scan operator in the operator tree (if any).
+     * @param scan_ranges the ranges gathered from the scan operator in the operator tree (if any).
      * Can be nullptr if the operators don't contain scan operation.
      */
     operator_container(
         std::unique_ptr<ops::operator_base> root,
         std::size_t operator_count,
         class io_exchange_map& io_exchange_map,
-        std::shared_ptr<impl::scan_range> range
+        std::vector<std::shared_ptr<impl::scan_range>> scan_ranges
     );
 
     /**
@@ -69,14 +69,14 @@ class operator_container {
 
     /**
      * @brief accessor to scan_range
-     * @return the range, or nullptr if there is no scan operation in the process
+     * @return the scan_range vector , or empty if there are no scan operations in the process
      */
-    [[nodiscard]] std::shared_ptr<impl::scan_range> const& range() const noexcept;
+    [[nodiscard]] std::vector<std::shared_ptr<impl::scan_range>> scan_ranges() const noexcept;
 private:
     std::unique_ptr<ops::operator_base> root_{};
     std::size_t operator_count_{};
     class io_exchange_map* io_exchange_map_{};
-    std::shared_ptr<impl::scan_range> range_{};
+    std::vector<std::shared_ptr<impl::scan_range>> scan_ranges_{};
 };
 
 } // namespace jogasaki::executor::process::impl::ops
diff --git a/test/jogasaki/executor/process/ops/scan_test.cpp b/test/jogasaki/executor/process/ops/scan_test.cpp
index 57099b3a..37a08561 100644
--- a/test/jogasaki/executor/process/ops/scan_test.cpp
+++ b/test/jogasaki/executor/process/ops/scan_test.cpp
@@ -176,7 +176,7 @@ TEST_F(scan_test, simple) {
     jogasaki::plan::compiler_context compiler_ctx{};
     io_exchange_map exchange_map{};
     operator_builder builder{processor_info_, {}, {}, exchange_map, &request_context_};
-    auto range = builder.create_range(target);
+    auto range = (builder.create_scan_ranges(target))[0];
     mock::task_context task_ctx{ {}, {}, {},{range}};
     scan_context ctx(&task_ctx, output_variables, get_storage(*db_, primary_idx->simple_name()), nullptr, tx.get(),range.get(), request_context_.request_resource(), &varlen_resource_);
     ASSERT_TRUE(static_cast<bool>(op(ctx)));
@@ -246,7 +246,7 @@ TEST_F(scan_test, nullable_fields) {
     jogasaki::plan::compiler_context compiler_ctx{};
     io_exchange_map exchange_map{};
     operator_builder builder{processor_info_, {}, {}, exchange_map, &request_context_};
-    auto range = builder.create_range(target);
+    auto range = (builder.create_scan_ranges(target))[0];
     mock::task_context task_ctx{ {}, {}, {},{range}};
     scan_context ctx(&task_ctx, output_variables, get_storage(*db_, primary_idx->simple_name()), nullptr, tx.get(),range.get(), request_context_.request_resource(), &varlen_resource_);
     ASSERT_TRUE(static_cast<bool>(op(ctx)));
@@ -344,7 +344,7 @@ TEST_F(scan_test, scan_info) {
     jogasaki::plan::compiler_context compiler_ctx{};
     io_exchange_map exchange_map{};
     operator_builder builder{processor_info_, {}, {}, exchange_map, &request_context_};
-    auto range = builder.create_range(target);
+    auto range = (builder.create_scan_ranges(target))[0];
     mock::task_context task_ctx{ {}, {}, {},{range}};
 
     put( *db_, primary_idx->simple_name(), create_record<kind::int8, kind::character>(100, accessor::text{"123456789012345678901234567890/B"}), create_record<kind::float8>(1.0));
@@ -435,7 +435,7 @@ TEST_F(scan_test, secondary_index) {
     request_context_.transaction(transaction_ctx);
     io_exchange_map exchange_map{};
     operator_builder builder{processor_info_, {}, {}, exchange_map, &request_context_};
-    auto range = builder.create_range(target);
+    auto range = (builder.create_scan_ranges(target))[0];
     mock::task_context task_ctx{ {}, {}, {} ,{range}};
 
     put( *db_, primary_idx->simple_name(), create_record<kind::int4>(10), create_record<kind::float8, kind::int8>(1.0, 100));
@@ -566,7 +566,7 @@ TEST_F(scan_test, host_variables) {
     jogasaki::plan::compiler_context compiler_ctx{};
     io_exchange_map exchange_map{};
     operator_builder builder{processor_info_, {}, {}, exchange_map, &request_context_};
-    auto range = builder.create_range(target);
+    auto range = (builder.create_scan_ranges(target))[0];
     mock::task_context task_ctx{ {}, {}, {},{range}};
 
     put( *db_, primary_idx->simple_name(), create_record<kind::int4, kind::int8>(100, 10), create_record<kind::int8>(1));