diff --git a/ydb/core/kqp/ut/common/columnshard.cpp b/ydb/core/kqp/ut/common/columnshard.cpp
index 10f162f8baa6..212d49076d02 100644
--- a/ydb/core/kqp/ut/common/columnshard.cpp
+++ b/ydb/core/kqp/ut/common/columnshard.cpp
@@ -17,6 +17,10 @@ namespace NKqp {
         return Kikimr;
     }
 
+    TTestActorRuntime& TTestHelper::GetRuntime() {
+        return *Kikimr.GetTestServer().GetRuntime();
+    }
+
     NYdb::NTable::TSession& TTestHelper::GetSession() {
         return Session;
     }
diff --git a/ydb/core/kqp/ut/common/columnshard.h b/ydb/core/kqp/ut/common/columnshard.h
index e374b973edbf..92b45eb60759 100644
--- a/ydb/core/kqp/ut/common/columnshard.h
+++ b/ydb/core/kqp/ut/common/columnshard.h
@@ -70,6 +70,7 @@ namespace NKqp {
     public:
         TTestHelper(const TKikimrSettings& settings);
         TKikimrRunner& GetKikimr();
+        TTestActorRuntime& GetRuntime();
         NYdb::NTable::TSession& GetSession();
         void CreateTable(const TColumnTableBase& table);
         void InsertData(const TColumnTable& table, TTestHelper::TUpdatesBuilder& updates, const std::function<void()> onBeforeCommit = {}, const NYdb::EStatus opStatus = NYdb::EStatus::SUCCESS);
diff --git a/ydb/core/kqp/ut/olap/kqp_olap_ut.cpp b/ydb/core/kqp/ut/olap/kqp_olap_ut.cpp
index 811b4d03d72b..a91b40588cf0 100644
--- a/ydb/core/kqp/ut/olap/kqp_olap_ut.cpp
+++ b/ydb/core/kqp/ut/olap/kqp_olap_ut.cpp
@@ -1,4 +1,5 @@
 #include <ydb/core/kqp/ut/common/kqp_ut_common.h>
+#include <ydb/core/kqp/ut/common/columnshard.h>
 #include <ydb/public/sdk/cpp/client/draft/ydb_long_tx.h>
 
 #include <ydb/core/sys_view/service/query_history.h>
@@ -5282,6 +5283,39 @@ Y_UNIT_TEST_SUITE(KqpOlap) {
         Cout << output << Endl;
         CompareYson(output, R"([[10u;]])");
     }
+
+    Y_UNIT_TEST(DuplicatesInIncomingBatch) {
+        auto csController = NYDBTest::TControllers::RegisterCSControllerGuard<NYDBTest::NColumnShard::TController>();
+        TKikimrSettings runnerSettings;
+        runnerSettings.WithSampleTables = false;
+        TTestHelper testHelper(runnerSettings);
+        Tests::NCommon::TLoggerInit(testHelper.GetRuntime()).Initialize();
+        TVector<TTestHelper::TColumnSchema> schema = {
+            TTestHelper::TColumnSchema().SetName("id").SetType(NScheme::NTypeIds::Int32).SetNullable(false),
+            TTestHelper::TColumnSchema().SetName("id_second").SetType(NScheme::NTypeIds::Utf8).SetNullable(false),
+            TTestHelper::TColumnSchema().SetName("resource_id").SetType(NScheme::NTypeIds::Utf8),
+            TTestHelper::TColumnSchema().SetName("level").SetType(NScheme::NTypeIds::Int32)
+        };
+        TTestHelper::TColumnTable testTable;
+
+        testTable.SetName("/Root/ColumnTableTest").SetPrimaryKey({"id", "id_second"}).SetSharding({"id"}).SetSchema(schema);
+        testHelper.CreateTable(testTable);
+
+        {
+            TTestHelper::TUpdatesBuilder tableInserter(testTable.GetArrowSchema(schema));
+            tableInserter.AddRow().Add(1).Add("test_res_1").AddNull().AddNull();
+            tableInserter.AddRow().Add(2).Add("test_res_2").Add("val1").AddNull();
+            tableInserter.AddRow().Add(3).Add("test_res_3").Add("val3").AddNull();
+            tableInserter.AddRow().Add(2).Add("test_res_2").Add("val2").AddNull();
+            testHelper.InsertData(testTable, tableInserter);
+        }
+        while (csController->GetIndexations().Val() == 0) {
+            Cout << "Wait indexation..." << Endl;
+            Sleep(TDuration::Seconds(2));
+        }
+        testHelper.ReadData("SELECT * FROM `/Root/ColumnTableTest` WHERE id=2", "[[2;\"test_res_2\";#;[\"val1\"]]]");
+    }
+
 }
 
 } // namespace NKqp
diff --git a/ydb/core/tx/columnshard/hooks/testing/controller.cpp b/ydb/core/tx/columnshard/hooks/testing/controller.cpp
index bae9ac68ad4b..2fcf27ebaf76 100644
--- a/ydb/core/tx/columnshard/hooks/testing/controller.cpp
+++ b/ydb/core/tx/columnshard/hooks/testing/controller.cpp
@@ -1,6 +1,7 @@
 #include "controller.h"
 #include <ydb/core/tx/columnshard/engines/column_engine.h>
 #include <ydb/core/tx/columnshard/engines/changes/compaction.h>
+#include <ydb/core/tx/columnshard/engines/changes/indexation.h>
 #include <contrib/libs/apache/arrow/cpp/src/arrow/record_batch.h>
 
 namespace NKikimr::NYDBTest::NColumnShard {
@@ -12,6 +13,11 @@ bool TController::DoOnAfterFilterAssembling(const std::shared_ptr<arrow::RecordB
     return true;
 }
 
+bool TController::DoOnWriteIndexComplete(const ui64 /*tabletId*/, const TString& /*changeClassName*/) {
+    Indexations.Inc();
+    return true;
+}
+
 bool TController::DoOnStartCompaction(std::shared_ptr<NOlap::TColumnEngineChanges>& changes) {
     if (auto compaction = dynamic_pointer_cast<NOlap::TCompactColumnEngineChanges>(changes)) {
         Compactions.Inc();
diff --git a/ydb/core/tx/columnshard/hooks/testing/controller.h b/ydb/core/tx/columnshard/hooks/testing/controller.h
index 29bf1995ff73..eed2aa61ce67 100644
--- a/ydb/core/tx/columnshard/hooks/testing/controller.h
+++ b/ydb/core/tx/columnshard/hooks/testing/controller.h
@@ -7,6 +7,7 @@ class TController: public ICSController {
 private:
     YDB_READONLY(TAtomicCounter, FilteredRecordsCount, 0);
     YDB_READONLY(TAtomicCounter, Compactions, 0);
+    YDB_READONLY(TAtomicCounter, Indexations, 0);
     YDB_ACCESSOR(std::optional<TDuration>, GuaranteeIndexationInterval, TDuration::Zero());
     YDB_ACCESSOR(std::optional<TDuration>, PeriodicWakeupActivationPeriod, std::nullopt);
     YDB_ACCESSOR(std::optional<TDuration>, StatsReportInterval, std::nullopt);
@@ -16,6 +17,7 @@ class TController: public ICSController {
 protected:
     virtual bool DoOnAfterFilterAssembling(const std::shared_ptr<arrow::RecordBatch>& batch) override;
     virtual bool DoOnStartCompaction(std::shared_ptr<NOlap::TColumnEngineChanges>& changes) override;
+    virtual bool DoOnWriteIndexComplete(const ui64 /*tabletId*/, const TString& /*changeClassName*/) override;
     virtual TDuration GetGuaranteeIndexationInterval(const TDuration defaultValue) const override {
         return GuaranteeIndexationInterval.value_or(defaultValue);
     }