diff --git a/velox/dwio/parquet/reader/CMakeLists.txt b/velox/dwio/parquet/reader/CMakeLists.txt
index 3fb5250b7e64..fbb38dd64eef 100644
--- a/velox/dwio/parquet/reader/CMakeLists.txt
+++ b/velox/dwio/parquet/reader/CMakeLists.txt
@@ -23,7 +23,6 @@ add_library(
   ParquetData.cpp
   RepeatedColumnReader.cpp
   RleBpDecoder.cpp
-  Statistics.cpp
   StructColumnReader.cpp
   StringColumnReader.cpp)
 
diff --git a/velox/dwio/parquet/reader/Metadata.cpp b/velox/dwio/parquet/reader/Metadata.cpp
index c0fa6ab7ca02..771e68e8a595 100644
--- a/velox/dwio/parquet/reader/Metadata.cpp
+++ b/velox/dwio/parquet/reader/Metadata.cpp
@@ -15,11 +15,142 @@
  */
 
 #include "velox/dwio/parquet/reader/Metadata.h"
-
-#include "velox/dwio/parquet/reader/Statistics.h"
+#include "velox/dwio/parquet/thrift/ParquetThriftTypes.h"
 
 namespace facebook::velox::parquet {
 
+template <typename T>
+inline const T load(const char* ptr) {
+  T ret;
+  std::memcpy(&ret, ptr, sizeof(ret));
+  return ret;
+}
+
+template <typename T>
+inline std::optional<T> getMin(const thrift::Statistics& columnChunkStats) {
+  return columnChunkStats.__isset.min_value
+      ? load<T>(columnChunkStats.min_value.data())
+      : (columnChunkStats.__isset.min
+             ? std::optional<T>(load<T>(columnChunkStats.min.data()))
+             : std::nullopt);
+}
+
+template <typename T>
+inline std::optional<T> getMax(const thrift::Statistics& columnChunkStats) {
+  return columnChunkStats.__isset.max_value
+      ? std::optional<T>(load<T>(columnChunkStats.max_value.data()))
+      : (columnChunkStats.__isset.max
+             ? std::optional<T>(load<T>(columnChunkStats.max.data()))
+             : std::nullopt);
+}
+
+template <>
+inline std::optional<std::string> getMin(
+    const thrift::Statistics& columnChunkStats) {
+  return columnChunkStats.__isset.min_value
+      ? std::optional(columnChunkStats.min_value)
+      : (columnChunkStats.__isset.min ? std::optional(columnChunkStats.min)
+                                      : std::nullopt);
+}
+
+template <>
+inline std::optional<std::string> getMax(
+    const thrift::Statistics& columnChunkStats) {
+  return columnChunkStats.__isset.max_value
+      ? std::optional(columnChunkStats.max_value)
+      : (columnChunkStats.__isset.max ? std::optional(columnChunkStats.max)
+                                      : std::nullopt);
+}
+
+std::unique_ptr<dwio::common::ColumnStatistics> buildColumnStatisticsFromThrift(
+    const thrift::Statistics& columnChunkStats,
+    const velox::Type& type,
+    uint64_t numRowsInRowGroup) {
+  std::optional<uint64_t> nullCount = columnChunkStats.__isset.null_count
+      ? std::optional<uint64_t>(columnChunkStats.null_count)
+      : std::nullopt;
+  std::optional<uint64_t> valueCount = nullCount.has_value()
+      ? std::optional<uint64_t>(numRowsInRowGroup - nullCount.value())
+      : std::nullopt;
+  std::optional<bool> hasNull = columnChunkStats.__isset.null_count
+      ? std::optional<bool>(columnChunkStats.null_count > 0)
+      : std::nullopt;
+
+  switch (type.kind()) {
+    case TypeKind::BOOLEAN:
+      return std::make_unique<dwio::common::BooleanColumnStatistics>(
+          valueCount, hasNull, std::nullopt, std::nullopt, std::nullopt);
+    case TypeKind::TINYINT:
+      return std::make_unique<dwio::common::IntegerColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<int8_t>(columnChunkStats),
+          getMax<int8_t>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::SMALLINT:
+      return std::make_unique<dwio::common::IntegerColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<int16_t>(columnChunkStats),
+          getMax<int16_t>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::INTEGER:
+      return std::make_unique<dwio::common::IntegerColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<int32_t>(columnChunkStats),
+          getMax<int32_t>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::BIGINT:
+      return std::make_unique<dwio::common::IntegerColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<int64_t>(columnChunkStats),
+          getMax<int64_t>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::REAL:
+      return std::make_unique<dwio::common::DoubleColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<float>(columnChunkStats),
+          getMax<float>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::DOUBLE:
+      return std::make_unique<dwio::common::DoubleColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<double>(columnChunkStats),
+          getMax<double>(columnChunkStats),
+          std::nullopt);
+    case TypeKind::VARCHAR:
+    case TypeKind::VARBINARY:
+      return std::make_unique<dwio::common::StringColumnStatistics>(
+          valueCount,
+          hasNull,
+          std::nullopt,
+          std::nullopt,
+          getMin<std::string>(columnChunkStats),
+          getMax<std::string>(columnChunkStats),
+          std::nullopt);
+
+    default:
+      return std::make_unique<dwio::common::ColumnStatistics>(
+          valueCount, hasNull, std::nullopt, std::nullopt);
+  }
+}
+
 common::CompressionKind thriftCodecToCompressionKind(
     thrift::CompressionCodec::type codec) {
   switch (codec) {
diff --git a/velox/dwio/parquet/reader/ParquetColumnReader.cpp b/velox/dwio/parquet/reader/ParquetColumnReader.cpp
index ea3169ae727a..c3816c0e960a 100644
--- a/velox/dwio/parquet/reader/ParquetColumnReader.cpp
+++ b/velox/dwio/parquet/reader/ParquetColumnReader.cpp
@@ -25,10 +25,8 @@
 #include "velox/dwio/parquet/reader/FloatingPointColumnReader.h"
 #include "velox/dwio/parquet/reader/IntegerColumnReader.h"
 #include "velox/dwio/parquet/reader/RepeatedColumnReader.h"
-#include "velox/dwio/parquet/reader/Statistics.h"
 #include "velox/dwio/parquet/reader/StringColumnReader.h"
 #include "velox/dwio/parquet/reader/StructColumnReader.h"
-#include "velox/dwio/parquet/thrift/ParquetThriftTypes.h"
 
 namespace facebook::velox::parquet {
 
diff --git a/velox/dwio/parquet/reader/ParquetData.cpp b/velox/dwio/parquet/reader/ParquetData.cpp
index 283190bbfb0a..a2688403ebcd 100644
--- a/velox/dwio/parquet/reader/ParquetData.cpp
+++ b/velox/dwio/parquet/reader/ParquetData.cpp
@@ -17,7 +17,6 @@
 #include "velox/dwio/parquet/reader/ParquetData.h"
 
 #include "velox/dwio/common/BufferedInput.h"
-#include "velox/dwio/parquet/reader/Statistics.h"
 
 namespace facebook::velox::parquet {
 
diff --git a/velox/dwio/parquet/reader/Statistics.cpp b/velox/dwio/parquet/reader/Statistics.cpp
deleted file mode 100644
index e7ee86a8b768..000000000000
--- a/velox/dwio/parquet/reader/Statistics.cpp
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "velox/dwio/parquet/reader/Statistics.h"
-
-#include "velox/dwio/common/Statistics.h"
-#include "velox/type/Type.h"
-
-namespace facebook::velox::parquet {
-
-std::unique_ptr<dwio::common::ColumnStatistics> buildColumnStatisticsFromThrift(
-    const thrift::Statistics& columnChunkStats,
-    const velox::Type& type,
-    uint64_t numRowsInRowGroup) {
-  std::optional<uint64_t> nullCount = columnChunkStats.__isset.null_count
-      ? std::optional<uint64_t>(columnChunkStats.null_count)
-      : std::nullopt;
-  std::optional<uint64_t> valueCount = nullCount.has_value()
-      ? std::optional<uint64_t>(numRowsInRowGroup - nullCount.value())
-      : std::nullopt;
-  std::optional<bool> hasNull = columnChunkStats.__isset.null_count
-      ? std::optional<bool>(columnChunkStats.null_count > 0)
-      : std::nullopt;
-
-  switch (type.kind()) {
-    case TypeKind::BOOLEAN:
-      return std::make_unique<dwio::common::BooleanColumnStatistics>(
-          valueCount, hasNull, std::nullopt, std::nullopt, std::nullopt);
-    case TypeKind::TINYINT:
-      return std::make_unique<dwio::common::IntegerColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<int8_t>(columnChunkStats),
-          getMax<int8_t>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::SMALLINT:
-      return std::make_unique<dwio::common::IntegerColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<int16_t>(columnChunkStats),
-          getMax<int16_t>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::INTEGER:
-      return std::make_unique<dwio::common::IntegerColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<int32_t>(columnChunkStats),
-          getMax<int32_t>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::BIGINT:
-      return std::make_unique<dwio::common::IntegerColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<int64_t>(columnChunkStats),
-          getMax<int64_t>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::REAL:
-      return std::make_unique<dwio::common::DoubleColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<float>(columnChunkStats),
-          getMax<float>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::DOUBLE:
-      return std::make_unique<dwio::common::DoubleColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<double>(columnChunkStats),
-          getMax<double>(columnChunkStats),
-          std::nullopt);
-    case TypeKind::VARCHAR:
-    case TypeKind::VARBINARY:
-      return std::make_unique<dwio::common::StringColumnStatistics>(
-          valueCount,
-          hasNull,
-          std::nullopt,
-          std::nullopt,
-          getMin<std::string>(columnChunkStats),
-          getMax<std::string>(columnChunkStats),
-          std::nullopt);
-
-    default:
-      return std::make_unique<dwio::common::ColumnStatistics>(
-          valueCount, hasNull, std::nullopt, std::nullopt);
-  }
-}
-
-} // namespace facebook::velox::parquet
diff --git a/velox/dwio/parquet/reader/Statistics.h b/velox/dwio/parquet/reader/Statistics.h
deleted file mode 100644
index 18f67d5b13b0..000000000000
--- a/velox/dwio/parquet/reader/Statistics.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include "velox/dwio/parquet/thrift/ParquetThriftTypes.h"
-
-#include <cstring>
-#include <optional>
-
-namespace facebook::velox {
-class Type;
-}
-
-namespace facebook::velox::dwio::common {
-class ColumnStatistics;
-}
-
-namespace facebook::velox::parquet {
-
-// TODO: provide function to merge multiple Statistics into one
-
-template <typename T>
-inline const T load(const char* ptr) {
-  T ret;
-  std::memcpy(&ret, ptr, sizeof(ret));
-  return ret;
-}
-
-template <typename T>
-inline std::optional<T> getMin(const thrift::Statistics& columnChunkStats) {
-  return columnChunkStats.__isset.min_value
-      ? load<T>(columnChunkStats.min_value.data())
-      : (columnChunkStats.__isset.min
-             ? std::optional<T>(load<T>(columnChunkStats.min.data()))
-             : std::nullopt);
-}
-
-template <typename T>
-inline std::optional<T> getMax(const thrift::Statistics& columnChunkStats) {
-  return columnChunkStats.__isset.max_value
-      ? std::optional<T>(load<T>(columnChunkStats.max_value.data()))
-      : (columnChunkStats.__isset.max
-             ? std::optional<T>(load<T>(columnChunkStats.max.data()))
-             : std::nullopt);
-}
-
-template <>
-inline std::optional<std::string> getMin(
-    const thrift::Statistics& columnChunkStats) {
-  return columnChunkStats.__isset.min_value
-      ? std::optional(columnChunkStats.min_value)
-      : (columnChunkStats.__isset.min ? std::optional(columnChunkStats.min)
-                                      : std::nullopt);
-}
-
-template <>
-inline std::optional<std::string> getMax(
-    const thrift::Statistics& columnChunkStats) {
-  return columnChunkStats.__isset.max_value
-      ? std::optional(columnChunkStats.max_value)
-      : (columnChunkStats.__isset.max ? std::optional(columnChunkStats.max)
-                                      : std::nullopt);
-}
-
-std::unique_ptr<dwio::common::ColumnStatistics> buildColumnStatisticsFromThrift(
-    const thrift::Statistics& columnChunkStats,
-    const velox::Type& type,
-    uint64_t numRowsInRowGroup);
-
-} // namespace facebook::velox::parquet