diff --git a/ydb/core/formats/arrow/arrow_batch_builder.cpp b/ydb/core/formats/arrow/arrow_batch_builder.cpp
index 7db800ffd816..5d87a89651ab 100644
--- a/ydb/core/formats/arrow/arrow_batch_builder.cpp
+++ b/ydb/core/formats/arrow/arrow_batch_builder.cpp
@@ -35,15 +35,26 @@ arrow::Status AppendCell(arrow::StringBuilder& builder, const TCell& cell) {
     return builder.Append(cell.Data(), cell.Size());
 }
 
-arrow::Status AppendCell(arrow::Decimal128Builder& builder, const TCell& cell) {
+// arrow::Status AppendCell(arrow::Decimal128Builder& builder, const TCell& cell) {
+//     if (cell.IsNull()) {
+//         return builder.AppendNull();
+//     }
+
+//     /// @warning There's no conversion for special YQL Decimal valies here,
+//     /// so we could convert them to Arrow and back but cannot calculate anything on them.
+//     /// We need separate Arrow.Decimal, YQL.Decimal, CH.Decimal and YDB.Decimal in future.
+//     return builder.Append(cell.Data());
+// }
+
+arrow::Status AppendCell(arrow::FixedSizeBinaryBuilder& builder, const TCell& cell) {
+    std::cout << "[DEBUG] AppendCell<FixedSizeBinaryBuilder>: is_null=" << cell.IsNull() << " size=" << cell.Size() << std::endl;
     if (cell.IsNull()) {
         return builder.AppendNull();
     }
-
-    /// @warning There's no conversion for special YQL Decimal valies here,
-    /// so we could convert them to Arrow and back but cannot calculate anything on them.
-    /// We need separate Arrow.Decimal, YQL.Decimal, CH.Decimal and YDB.Decimal in future.
-    return builder.Append(cell.Data());
+    if (cell.Size() != 16) {
+        return arrow::Status::Invalid("Decimal cell must be 16 bytes, got ", cell.Size());
+    }
+    return builder.Append(reinterpret_cast<const uint8_t*>(cell.Data()));
 }
 
 template <typename TDataType>
diff --git a/ydb/core/formats/arrow/arrow_helpers.cpp b/ydb/core/formats/arrow/arrow_helpers.cpp
index 0cc76775251b..f42e0ea873ef 100644
--- a/ydb/core/formats/arrow/arrow_helpers.cpp
+++ b/ydb/core/formats/arrow/arrow_helpers.cpp
@@ -37,8 +37,9 @@ std::shared_ptr<arrow::DataType> CreateEmptyArrowImpl(const NScheme::TTypeInfo&
 }
 
 template <>
-std::shared_ptr<arrow::DataType> CreateEmptyArrowImpl<arrow::Decimal128Type>(const NScheme::TTypeInfo& typeInfo) {
-    return arrow::decimal(typeInfo.GetDecimalType().GetPrecision(), typeInfo.GetDecimalType().GetScale());
+std::shared_ptr<arrow::DataType> CreateEmptyArrowImpl<arrow::FixedSizeBinaryType>(const NScheme::TTypeInfo& typeInfo) {
+    Y_UNUSED(typeInfo);
+    return std::make_shared<arrow::FixedSizeBinaryType>(16);
 }
 
 template <>
diff --git a/ydb/core/formats/arrow/converter.h b/ydb/core/formats/arrow/converter.h
index 8288d50cb178..e74cddb372bc 100644
--- a/ydb/core/formats/arrow/converter.h
+++ b/ydb/core/formats/arrow/converter.h
@@ -33,7 +33,12 @@ class TArrowToYdbConverter {
     template <typename TArray>
     TCell MakeCellFromView(const std::shared_ptr<arrow::Array>& column, i64 row) {
         auto array = std::static_pointer_cast<TArray>(column);
+        if (array->IsNull(row)) {
+            std::cout << "[DEBUG] MakeCellFromView: row=" << row << " is_null=1 size=0" << std::endl;
+            return TCell();
+        }
         auto data = array->GetView(row);
+        std::cout << "[DEBUG] MakeCellFromView: row=" << row << " is_null=0 size=" << data.size() << std::endl;
         return TCell(data.data(), data.size());
     }
 
@@ -57,6 +62,18 @@ class TArrowToYdbConverter {
         return MakeCellFromView<arrow::Decimal128Array>(column, row);
     }
 
+    template <>
+    TCell MakeCell<arrow::FixedSizeBinaryArray>(const std::shared_ptr<arrow::Array>& column, i64 row) {
+        auto array = std::static_pointer_cast<arrow::FixedSizeBinaryArray>(column);
+        if (array->IsNull(row)) {
+            std::cout << "[DEBUG] MakeCell<FixedSizeBinaryArray>: row=" << row << " is_null=1 size=0" << std::endl;
+            return TCell();
+        }
+        auto data = array->GetView(row);
+        std::cout << "[DEBUG] MakeCell<FixedSizeBinaryArray>: row=" << row << " is_null=0 size=" << data.size() << std::endl;
+        return TCell(data.data(), data.size());
+    }
+
 public:
     static bool NeedDataConversion(const NScheme::TTypeInfo& colType);
 
diff --git a/ydb/core/formats/arrow/switch/switch_type.h b/ydb/core/formats/arrow/switch/switch_type.h
index b5183df39d9a..fd8b167ef5e4 100644
--- a/ydb/core/formats/arrow/switch/switch_type.h
+++ b/ydb/core/formats/arrow/switch/switch_type.h
@@ -64,7 +64,7 @@ template <typename TFunc>
         case NScheme::NTypeIds::Interval:
             return callback(TTypeWrapper<arrow::DurationType>());
         case NScheme::NTypeIds::Decimal:
-            return callback(TTypeWrapper<arrow::Decimal128Type>());
+            return callback(TTypeWrapper<arrow::FixedSizeBinaryType>());
 
         case NScheme::NTypeIds::Datetime64:
         case NScheme::NTypeIds::Timestamp64:
diff --git a/ydb/core/grpc_services/rpc_load_rows.cpp b/ydb/core/grpc_services/rpc_load_rows.cpp
index e544a56f94db..fbbc5e7348cf 100644
--- a/ydb/core/grpc_services/rpc_load_rows.cpp
+++ b/ydb/core/grpc_services/rpc_load_rows.cpp
@@ -18,6 +18,7 @@
 
 #include <util/string/vector.h>
 #include <util/generic/size_literals.h>
+#include <util/string/cast.h>
 
 namespace NKikimr {
 namespace NGRpcService {
@@ -28,7 +29,7 @@ using namespace Ydb;
 namespace {
 
 // TODO: no mapping for DATE, DATETIME, TZ_*, YSON, JSON, UUID, JSON_DOCUMENT, DYNUMBER
-bool ConvertArrowToYdbPrimitive(const arrow::DataType& type, Ydb::Type& toType) {
+bool ConvertArrowToYdbPrimitive(const arrow::DataType& type, Ydb::Type& toType, const arrow::Field* field = nullptr) {
     switch (type.id()) {
         case arrow::Type::BOOL:
             toType.set_type_id(Ydb::Type::BOOL);
@@ -82,9 +83,29 @@ bool ConvertArrowToYdbPrimitive(const arrow::DataType& type, Ydb::Type& toType)
             decimalType->set_scale(arrowDecimal->scale());
             return true;
         }
+        case arrow::Type::FIXED_SIZE_BINARY: {
+            auto& fsb = static_cast<const arrow::FixedSizeBinaryType&>(type);
+            if (fsb.byte_width() == 16) {
+                Ydb::DecimalType* decimalType = toType.mutable_decimal_type();
+                ui32 precision = 22, scale = 9;
+                if (field && field->metadata()) {
+                    auto precisionMeta = field->metadata()->Get("precision").ValueOr("");
+                    auto scaleMeta = field->metadata()->Get("scale").ValueOr("");
+                    if (!precisionMeta.empty()) {
+                        precision = FromString<ui32>(precisionMeta);
+                    }
+                    if (!scaleMeta.empty()) {
+                        scale = FromString<ui32>(scaleMeta);
+                    }
+                }
+                decimalType->set_precision(precision);
+                decimalType->set_scale(scale);
+                return true;
+            }
+            break;
+        }
         case arrow::Type::NA:
         case arrow::Type::HALF_FLOAT:
-        case arrow::Type::FIXED_SIZE_BINARY:
         case arrow::Type::DATE32:
         case arrow::Type::DATE64:
         case arrow::Type::TIME32:
@@ -410,7 +431,7 @@ class TUploadColumnsRPCPublic : public NTxProxy::TUploadRowsBase<NKikimrServices
             auto& type = field->type();
 
             Ydb::Type ydbType;
-            if (!ConvertArrowToYdbPrimitive(*type, ydbType)) {
+            if (!ConvertArrowToYdbPrimitive(*type, ydbType, field.get())) {
                 return TConclusionStatus::Fail("Cannot convert arrow type to ydb one: " + type->ToString());
             }
             out.emplace_back(name, std::move(ydbType));
diff --git a/ydb/core/kqp/opt/peephole/kqp_opt_peephole_wide_read.cpp b/ydb/core/kqp/opt/peephole/kqp_opt_peephole_wide_read.cpp
index 16f2f4e14393..47932188168f 100644
--- a/ydb/core/kqp/opt/peephole/kqp_opt_peephole_wide_read.cpp
+++ b/ydb/core/kqp/opt/peephole/kqp_opt_peephole_wide_read.cpp
@@ -17,6 +17,8 @@ TExprBase KqpBuildWideReadTable(const TExprBase& node, TExprContext& ctx, TTypeA
         return node;
     }
 
+    Y_UNUSED(typesCtx);
+
     auto rowType = node.Ref().GetTypeAnn()->Cast<TFlowExprType>()->GetItemType()->Cast<TStructExprType>();
 
     TVector<TCoArgument> args;
@@ -41,18 +43,14 @@ TExprBase KqpBuildWideReadTable(const TExprBase& node, TExprContext& ctx, TTypeA
     } else if (auto maybeRead = node.Maybe<TKqpReadTableRanges>()) {
         wideRead = ctx.RenameNode(*node.Raw(), TKqpWideReadTableRanges::CallableName());
     } else if (auto maybeRead = node.Maybe<TKqpReadOlapTableRanges>()) {
-        if (typesCtx.IsBlockEngineEnabled()) {
-            wideRead = Build<TCoToFlow>(ctx, node.Pos())
-                .Input<TCoWideFromBlocks>()
-                    .Input<TCoFromFlow>()
-                        .Input(ctx.RenameNode(*node.Raw(), TKqpBlockReadOlapTableRanges::CallableName()))
-                        .Build()
+        wideRead = Build<TCoToFlow>(ctx, node.Pos())
+            .Input<TCoWideFromBlocks>()
+                .Input<TCoFromFlow>()
+                    .Input(ctx.RenameNode(*node.Raw(), TKqpBlockReadOlapTableRanges::CallableName()))
                     .Build()
-                .Done()
-                .Ptr();
-        } else {
-            wideRead = ctx.RenameNode(*node.Raw(), TKqpWideReadOlapTableRanges::CallableName());
-        }
+                .Build()
+            .Done()
+            .Ptr();
     } else {
         YQL_ENSURE(false, "Unknown read table operation: " << node.Ptr()->Content());
     }
diff --git a/ydb/core/kqp/ut/common/columnshard.cpp b/ydb/core/kqp/ut/common/columnshard.cpp
index f44ce45889b5..ab40dd9eb1bc 100644
--- a/ydb/core/kqp/ut/common/columnshard.cpp
+++ b/ydb/core/kqp/ut/common/columnshard.cpp
@@ -1,6 +1,7 @@
 #include "columnshard.h"
 
 #include <ydb/core/base/tablet_pipecache.h>
+#include <ydb/core/formats/arrow/converter.h>
 #include <ydb/core/formats/arrow/serializer/native.h>
 #include <ydb/core/formats/arrow/serializer/parsing.h>
 #include <ydb/core/testlib/cs_helper.h>
@@ -390,8 +391,16 @@ namespace NKqp {
             return arrow::field(name, arrow::int64(), nullable);
         case NScheme::NTypeIds::JsonDocument:
             return arrow::field(name, arrow::binary(), nullable);
-        case NScheme::NTypeIds::Decimal:
-            return arrow::field(name, arrow::decimal(typeInfo.GetDecimalType().GetPrecision(), typeInfo.GetDecimalType().GetScale()), nullable);
+        case NScheme::NTypeIds::Decimal: {
+            auto meta = arrow::KeyValueMetadata::Make(
+                std::vector<std::string>{"precision", "scale"},
+                std::vector<std::string>{
+                    ToString(typeInfo.GetDecimalType().GetPrecision()),
+                    ToString(typeInfo.GetDecimalType().GetScale())
+                }
+            );
+            return arrow::field(name, arrow::fixed_size_binary(16), nullable, meta);
+        }
         case NScheme::NTypeIds::Pg:
             switch (NPg::PgTypeIdFromTypeDesc(typeInfo.GetPgTypeDesc())) {
                 case INT2OID:
diff --git a/ydb/core/kqp/ut/olap/decimal_ut.cpp b/ydb/core/kqp/ut/olap/decimal_ut.cpp
index 99cb4795ffd2..3e0fb61da7cd 100644
--- a/ydb/core/kqp/ut/olap/decimal_ut.cpp
+++ b/ydb/core/kqp/ut/olap/decimal_ut.cpp
@@ -244,9 +244,9 @@ Y_UNIT_TEST_SUITE(KqpDecimalColumnShard) {
         tester35.PrepareTable1();
 
         auto check = [](const TDecimalTestCase& tester) {
-            tester.CheckQuery("SELECT min(dec) FROM `/Root/Table1`", "[[[\"3.14\"]]]");
-            tester.CheckQuery("SELECT max(dec) FROM `/Root/Table1`", "[[[\"12.46\"]]]");
-            tester.CheckQuery("SELECT sum(dec) FROM `/Root/Table1`", "[[[\"32.252\"]]]");
+            tester.CheckQuery("SELECT min(dec) FROM `/Root/Table1`", "[[[\"3.14\"]]]", EQueryMode::EXECUTE_QUERY);
+            tester.CheckQuery("SELECT max(dec) FROM `/Root/Table1`", "[[[\"12.46\"]]]", EQueryMode::EXECUTE_QUERY);
+            tester.CheckQuery("SELECT sum(dec) FROM `/Root/Table1`", "[[[\"32.252\"]]]", EQueryMode::EXECUTE_QUERY);
         };
 
         check(tester22);
diff --git a/ydb/core/tx/columnshard/test_helper/columnshard_ut_common.h b/ydb/core/tx/columnshard/test_helper/columnshard_ut_common.h
index 38f878b400ed..5a35cd98e4c3 100644
--- a/ydb/core/tx/columnshard/test_helper/columnshard_ut_common.h
+++ b/ydb/core/tx/columnshard/test_helper/columnshard_ut_common.h
@@ -534,9 +534,13 @@ class TTableUpdatesBuilder {
                     }
                 }
 
-                if constexpr (std::is_same<TData, NYdb::TDecimalValue>::value) {
-                    if constexpr (arrow::is_decimal128_type<T>::value) {
-                        Y_ABORT_UNLESS(typedBuilder.Append(arrow::Decimal128(data.Hi_, data.Low_)).ok());
+                if constexpr (std::is_same<TData, NYdb::Dev::TDecimalValue>::value) {
+                    if constexpr (std::is_same<T, arrow::FixedSizeBinaryType>::value) {
+                        char bytes[16] = {0};
+                        // Little-endian: Low_ (unsigned) в первые 8 байт, Hi_ (signed) в последние 8 байт
+                        std::memcpy(bytes, &data.Low_, 8);
+                        std::memcpy(bytes + 8, &data.Hi_, 8);
+                        Y_ABORT_UNLESS(typedBuilder.Append(bytes).ok());
                         return true;
                     }
                 }
diff --git a/ydb/core/tx/tx_proxy/upload_rows_common_impl.h b/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
index 4f419a63e434..7a8ec5d742de 100644
--- a/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
+++ b/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
@@ -519,7 +519,9 @@ class TUploadRowsBase : public TActorBootstrapped<TUploadRowsBase<DerivedActivit
 
             for (const auto& [colName, colType] : YdbSchema) {
                 if (HasInternalConversion.contains(colName)) {
-                    continue;
+                    if (colType.GetTypeId() != NScheme::NTypeIds::Decimal) {
+                        continue;
+                    }
                 }
                 if (NArrow::TArrowToYdbConverter::NeedDataConversion(colType)) {
                     ColumnsToConvert[colName] = colType;
diff --git a/ydb/library/formats/arrow/switch/switch_type.h b/ydb/library/formats/arrow/switch/switch_type.h
index 314056d4a22b..b95bbfcad6a6 100644
--- a/ydb/library/formats/arrow/switch/switch_type.h
+++ b/ydb/library/formats/arrow/switch/switch_type.h
@@ -122,7 +122,7 @@ TResult SwitchTypeImpl(arrow::Type::type typeId, TFunc&& f) {
         case arrow::Type::INTERVAL_MONTHS:
             return f(TTypeWrapper<arrow::MonthIntervalType>());
         case arrow::Type::DECIMAL:
-            return f(TTypeWrapper<arrow::Decimal128Type>());
+            return f(TTypeWrapper<arrow::FixedSizeBinaryType>());
         case arrow::Type::DURATION:
             return f(TTypeWrapper<arrow::DurationType>());
         case arrow::Type::LARGE_STRING:
diff --git a/ydb/tests/functional/tpc/medium/test_tpch.py b/ydb/tests/functional/tpc/medium/test_tpch.py
index 4dd5f0bf0e9b..1c9ab637973d 100644
--- a/ydb/tests/functional/tpc/medium/test_tpch.py
+++ b/ydb/tests/functional/tpc/medium/test_tpch.py
@@ -5,9 +5,23 @@
 class TestTpchS1(tpch.TestTpch1, FunctionalTestBase):
     iterations: int = 1
 
+    @classmethod
+    def addition_init_params(cls) -> list[str]:
+        if cls.float_mode:
+            return ['--float-mode', cls.float_mode]
+        return []
+
     @classmethod
     def setup_class(cls) -> None:
         cls.setup_cluster()
-        cls.run_cli(['workload', 'tpch', '-p', 'olap_yatests/tpch/s1', 'init', '--store=column'])
+        cls.run_cli(['workload', 'tpch', '-p', 'olap_yatests/tpch/s1', 'init', '--store=row'] + cls.addition_init_params())
         cls.run_cli(['workload', 'tpch', '-p', 'olap_yatests/tpch/s1', 'import', 'generator', '--scale=1'])
         tpch.TestTpch1.setup_class()
+
+
+class TestTpchS1Decimal_22_9(TestTpchS1):
+    float_mode = 'decimal_ydb'
+
+
+class TestTpchS1DecimalNative(TestTpchS1):
+    float_mode = 'decimal'
\ No newline at end of file
diff --git a/ydb/tests/olap/lib/ydb_cli.py b/ydb/tests/olap/lib/ydb_cli.py
index 353d25f07419..ab842c02fb4d 100644
--- a/ydb/tests/olap/lib/ydb_cli.py
+++ b/ydb/tests/olap/lib/ydb_cli.py
@@ -152,7 +152,9 @@ def __init__(self,
                      scale: Optional[int],
                      query_prefix: Optional[str],
                      external_path: str,
-                     threads: int):
+                     threads: int,
+                     float_mode: str,
+                     ):
             self.result = YdbCliHelper.WorkloadRunResult()
             self.iterations = iterations
             self.check_canonical = check_canonical
@@ -172,6 +174,7 @@ def __init__(self,
             self.__plan_path = f'{self.__prefix}.plan'
             self.__query_output_path = f'{self.__prefix}.result'
             self.json_path = f'{self.__prefix}.stats.json'
+            self.float_mode = float_mode
 
         def get_plan_path(self, query_name: str, plan_name: Any) -> str:
             return f'{self.__plan_path}.{query_name}.{plan_name}'
@@ -204,6 +207,8 @@ def __get_cmd(self) -> list[str]:
                 cmd += ['--scale', str(self.scale)]
             if self.threads > 0:
                 cmd += ['--threads', str(self.threads)]
+            if self.float_mode:
+                cmd += ['--float-mode', self.float_mode]
             return cmd
 
         def run(self) -> YdbCliHelper.WorkloadRunResult:
@@ -343,7 +348,7 @@ def __process(self) -> YdbCliHelper.WorkloadRunResult:
     @staticmethod
     def workload_run(workload_type: WorkloadType, path: str, query_names: list[str], iterations: int = 5,
                      timeout: float = 100., check_canonical: CheckCanonicalPolicy = CheckCanonicalPolicy.NO, query_syntax: str = '',
-                     scale: Optional[int] = None, query_prefix=None, external_path='', threads: int = 0) -> dict[str, YdbCliHelper.WorkloadRunResult]:
+                     scale: Optional[int] = None, query_prefix=None, external_path='', threads: int = 0, float_mode: str = '') -> dict[str, YdbCliHelper.WorkloadRunResult]:
         runner = YdbCliHelper.WorkloadRunner(
             workload_type,
             path,
@@ -355,7 +360,8 @@ def workload_run(workload_type: WorkloadType, path: str, query_names: list[str],
             scale,
             query_prefix=query_prefix,
             external_path=external_path,
-            threads=threads
+            threads=threads,
+            float_mode=float_mode,
         )
         extended_query_names = query_names + ["Sum", "Avg", "GAvg"]
         if runner.run():
diff --git a/ydb/tests/olap/load/lib/conftest.py b/ydb/tests/olap/load/lib/conftest.py
index 21f838cdbd91..b3dc07caf80b 100644
--- a/ydb/tests/olap/load/lib/conftest.py
+++ b/ydb/tests/olap/load/lib/conftest.py
@@ -38,6 +38,7 @@ def __init__(self, iterations: Optional[int] = None, timeout: Optional[float] =
     scale: Optional[int] = None
     query_prefix: str = get_external_param('query-prefix', '')
     verify_data: bool = True
+    float_mode: str = ''
     __nodes_state: Optional[dict[str, YdbCluster.Node]] = None
 
     @classmethod
@@ -465,6 +466,7 @@ def run_workload_test(self, path: str, query_num: Optional[int] = None, query_na
             scale=self.scale,
             query_prefix=qparams.query_prefix,
             external_path=self.get_external_path(),
+            float_mode=self.float_mode,
         )[query_name]
         self.process_query_result(result, query_name, True)
 
@@ -827,7 +829,8 @@ def do_setup_class(cls):
             scale=cls.scale,
             query_prefix=qparams.query_prefix,
             external_path=cls.get_external_path(),
-            threads=cls.threads
+            threads=cls.threads,
+            float_mode=cls.float_mode,
         )
 
     def test(self, query_name):