diff --git a/dbms/src/Flash/tests/gtest_projection_executor.cpp b/dbms/src/Flash/tests/gtest_projection_executor.cpp
index d7e90b6cb51..599044f5503 100644
--- a/dbms/src/Flash/tests/gtest_projection_executor.cpp
+++ b/dbms/src/Flash/tests/gtest_projection_executor.cpp
@@ -343,7 +343,7 @@ try
               .scan("test_db", "test_table3")
               .project({lit(Field(String("a")))})
               .build(context);
-    executeAndAssertColumnsEqual(req, {createColumns({toVec<String>({"a", "a", "a", "a", "a"})})});
+    executeAndAssertColumnsEqual(req, {createColumns({createConstColumn<String>(5, "a")})});
 
     req = context
               .scan("test_db", "test_table3")
@@ -351,7 +351,7 @@ try
               .project(MockAstVec{})
               .project({lit(Field(String("a")))})
               .build(context);
-    executeAndAssertColumnsEqual(req, {createColumns({toVec<String>({"a", "a", "a", "a", "a"})})});
+    executeAndAssertColumnsEqual(req, {createColumns({createConstColumn<String>(5, "a")})});
 
     req = context
               .scan("test_db", "test_table3")
@@ -359,7 +359,7 @@ try
               .project(MockAstVec{})
               .project({lit(Field(String("a")))})
               .build(context);
-    executeAndAssertColumnsEqual(req, {createColumns({toVec<String>({"a", "a", "a", "a", "a"})})});
+    executeAndAssertColumnsEqual(req, {createColumns({createConstColumn<String>(5, "a")})});
 
     req = context
               .scan("test_db", "test_table3")
diff --git a/dbms/src/Storages/DeltaMerge/tests/gtest_segment_test_basic.cpp b/dbms/src/Storages/DeltaMerge/tests/gtest_segment_test_basic.cpp
index a890c868d0b..85c54c5e7c0 100644
--- a/dbms/src/Storages/DeltaMerge/tests/gtest_segment_test_basic.cpp
+++ b/dbms/src/Storages/DeltaMerge/tests/gtest_segment_test_basic.cpp
@@ -303,22 +303,7 @@ Block SegmentTestBasic::prepareWriteBlock(Int64 start_key, Int64 end_key, bool i
 
 Block sortMergeBlocks(std::vector<Block> && blocks)
 {
-    auto accumulated_block = std::move(blocks[0]);
-
-    for (size_t block_idx = 1; block_idx < blocks.size(); ++block_idx)
-    {
-        auto block = std::move(blocks[block_idx]);
-
-        size_t columns = block.columns();
-        size_t rows = block.rows();
-
-        for (size_t i = 0; i < columns; ++i)
-        {
-            MutableColumnPtr mutable_column = (*std::move(accumulated_block.getByPosition(i).column)).mutate();
-            mutable_column->insertRangeFrom(*block.getByPosition(i).column, 0, rows);
-            accumulated_block.getByPosition(i).column = std::move(mutable_column);
-        }
-    }
+    auto accumulated_block = mergeBlocks(std::move(blocks));
 
     SortDescription sort;
     sort.emplace_back(EXTRA_HANDLE_COLUMN_NAME, 1, 0);
diff --git a/dbms/src/TestUtils/ExecutorTestUtils.cpp b/dbms/src/TestUtils/ExecutorTestUtils.cpp
index 7719d021b37..7ca140ee650 100644
--- a/dbms/src/TestUtils/ExecutorTestUtils.cpp
+++ b/dbms/src/TestUtils/ExecutorTestUtils.cpp
@@ -166,34 +166,6 @@ void ExecutorTest::executeAndAssertRowsEqual(const std::shared_ptr<tipb::DAGRequ
     });
 }
 
-Block mergeBlocksForTest(Blocks blocks)
-{
-    if (blocks.empty())
-        return {};
-
-    Block sample_block = blocks.back();
-    std::vector<MutableColumnPtr> actual_cols;
-    for (const auto & column : sample_block.getColumnsWithTypeAndName())
-    {
-        actual_cols.push_back(column.type->createColumn());
-    }
-    for (const auto & block : blocks)
-    {
-        for (size_t i = 0; i < block.columns(); ++i)
-        {
-            for (size_t j = 0; j < block.rows(); ++j)
-            {
-                actual_cols[i]->insert((*(block.getColumnsWithTypeAndName())[i].column)[j]);
-            }
-        }
-    }
-
-    ColumnsWithTypeAndName actual_columns;
-    for (size_t i = 0; i < actual_cols.size(); ++i)
-        actual_columns.push_back({std::move(actual_cols[i]), sample_block.getColumnsWithTypeAndName()[i].type, sample_block.getColumnsWithTypeAndName()[i].name, sample_block.getColumnsWithTypeAndName()[i].column_id});
-    return Block(actual_columns);
-}
-
 void readStream(Blocks & blocks, BlockInputStreamPtr stream)
 {
     stream->readPrefix();
@@ -214,7 +186,7 @@ DB::ColumnsWithTypeAndName readBlocks(std::vector<BlockInputStreamPtr> streams)
     Blocks actual_blocks;
     for (const auto & stream : streams)
         readStream(actual_blocks, stream);
-    return mergeBlocksForTest(std::move(actual_blocks)).getColumnsWithTypeAndName();
+    return mergeBlocks(std::move(actual_blocks)).getColumnsWithTypeAndName();
 }
 
 void ExecutorTest::enablePlanner(bool is_enable)
@@ -238,7 +210,7 @@ ColumnsWithTypeAndName ExecutorTest::executeStreams(DAGContext * dag_context)
     // Currently, don't care about regions information in tests.
     Blocks blocks;
     queryExecute(context.context, /*internal=*/true)->execute([&blocks](const Block & block) { blocks.push_back(block); }).verify();
-    return mergeBlocksForTest(std::move(blocks)).getColumnsWithTypeAndName();
+    return mergeBlocks(std::move(blocks)).getColumnsWithTypeAndName();
 }
 
 Blocks ExecutorTest::getExecuteStreamsReturnBlocks(const std::shared_ptr<tipb::DAGRequest> & request, size_t concurrency)