diff --git a/src/Interpreters/Squashing.cpp b/src/Interpreters/Squashing.cpp
index 526af3db2e4..8f0964403b1 100644
--- a/src/Interpreters/Squashing.cpp
+++ b/src/Interpreters/Squashing.cpp
@@ -147,47 +147,35 @@ Block ApplySquashing::addImpl(Chunk && input_chunk)
         return Block();
 
     const auto *info = getInfoFromChunk(input_chunk);
-    append(info->chunks);
+    for (auto & chunk : info->chunks)
+        append(chunk);
 
     Block to_return;
     std::swap(to_return, accumulated_block);
     return to_return;
 }
 
-void ApplySquashing::append(const std::vector<Chunk> & input_chunks)
+void ApplySquashing::append(Chunk & input_chunk)
 {
-    std::vector<IColumn::MutablePtr> mutable_columns;
-    size_t rows = 0;
-    for (const Chunk & chunk : input_chunks)
-        rows += chunk.getNumRows();
-
-    // add here resize of mutable_column
-    for (const auto & input_chunk : input_chunks)
+    if (input_chunk.getNumColumns() == 0)
+        return;
+    if (!accumulated_block)
     {
-        if (!accumulated_block)
+        for (size_t i = 0; i < input_chunk.getNumColumns(); ++ i)
         {
-            for (size_t i = 0; i < input_chunks[0].getNumColumns(); ++ i)
-            {
-                ColumnWithTypeAndName col = ColumnWithTypeAndName(input_chunks[0].getColumns()[i], header.getDataTypes()[i], header.getNames()[i]);
-                mutable_columns.push_back(IColumn::mutate(col.column));
-                accumulated_block.insert(col);
-            }
+            ColumnWithTypeAndName col = ColumnWithTypeAndName(input_chunk.getColumns()[i], header.getDataTypes()[i], header.getNames()[i]);
+            accumulated_block.insert(accumulated_block.columns(), col);
         }
+        return;
+    }
 
-        if (input_chunk.getNumColumns() == 0)
-            continue;
+    for (size_t i = 0, size = accumulated_block.columns(); i < size; ++i)
+    {
+        const auto source_column = input_chunk.getColumns()[i];
 
-        for (auto & column : mutable_columns)
-            column->reserve(rows);
-
-        for (size_t i = 0, size = accumulated_block.columns(); i < size; ++i)
-        {
-            const auto source_column = input_chunk.getColumns()[i];
-
-            mutable_columns[i] = IColumn::mutate(std::move(accumulated_block.getByPosition(i).column));
-            mutable_columns[i]->insertRangeFrom(*source_column, 0, source_column->size());
-            accumulated_block.getByPosition(i).column = mutable_columns[i]->cloneFinalized();
-        }
+        auto mutable_column = IColumn::mutate(std::move(accumulated_block.getByPosition(i).column));
+        mutable_column->insertRangeFrom(*source_column, 0, source_column->size());
+        accumulated_block.getByPosition(i).column = std::move(mutable_column);
     }
 }
 
diff --git a/src/Interpreters/Squashing.h b/src/Interpreters/Squashing.h
index a68b581d40a..8273ae8cc8e 100644
--- a/src/Interpreters/Squashing.h
+++ b/src/Interpreters/Squashing.h
@@ -70,7 +70,7 @@ private:
 
     const ChunksToSquash * getInfoFromChunk(const Chunk & chunk);
 
-    void append(const std::vector<Chunk> & input_chunk);
+    void append(Chunk & input_chunk);
 
     bool isEnoughSize(const Block & block);
     bool isEnoughSize(size_t rows, size_t bytes) const;
diff --git a/src/Processors/Transforms/PlanSquashingTransform.cpp b/src/Processors/Transforms/PlanSquashingTransform.cpp
index f4106204462..51781b03853 100644
--- a/src/Processors/Transforms/PlanSquashingTransform.cpp
+++ b/src/Processors/Transforms/PlanSquashingTransform.cpp
@@ -1,6 +1,5 @@
 #include <Processors/Transforms/PlanSquashingTransform.h>
 #include <Processors/IProcessor.h>
-#include "Common/logger_useful.h"
 #include <Common/Exception.h>
 
 namespace DB
diff --git a/src/Storages/ProjectionsDescription.cpp b/src/Storages/ProjectionsDescription.cpp
index 45add4332ff..070245ba1b4 100644
--- a/src/Storages/ProjectionsDescription.cpp
+++ b/src/Storages/ProjectionsDescription.cpp
@@ -318,7 +318,7 @@ Block ProjectionDescription::calculate(const Block & block, ContextPtr context)
     }
     else
     {
-        builder.addTransform(std::make_shared<SimpleSquashingTransform>(builder.getHeader(), block.rows(), 0));
+        builder.addTransform(std::make_shared<SquashingTransform>(builder.getHeader(), block.rows(), 0));
     }
 
     auto pipeline = QueryPipelineBuilder::getPipeline(std::move(builder));