diff --git a/velox/dwio/common/tests/BitPackDecoderBenchmark.cpp b/velox/dwio/common/tests/BitPackDecoderBenchmark.cpp
index 96aad4c32776..d3ffa0eeede4 100644
--- a/velox/dwio/common/tests/BitPackDecoderBenchmark.cpp
+++ b/velox/dwio/common/tests/BitPackDecoderBenchmark.cpp
@@ -22,7 +22,7 @@
 #include "velox/dwio/common/tests/Lemire/bmipacking32.h"
 #endif
 
-#include "velox/dwio/common/tests/duckdb/FastpforLib.h"
+#include "velox/dwio/common/tests/Lemire/FastPFor/bitpackinghelpers.h"
 
 #include <arrow/util/rle_encoding.h>
 #include <folly/Benchmark.h>
@@ -290,7 +290,7 @@ void fastpforlib(uint8_t bitWidth, T* result) {
   auto inputBuffer = reinterpret_cast<const T*>(bitPackedData[bitWidth].data());
   for (auto i = 0; i < numBatches; i++) {
     // Read 4 bytes and unpack 32 values
-    duckdb_fastpforlib::fastunpack(
+    velox::fastpforlib::fastunpack(
         inputBuffer + i * 4, result + i * 32, bitWidth);
   }
 }
diff --git a/velox/dwio/common/tests/CMakeLists.txt b/velox/dwio/common/tests/CMakeLists.txt
index a6a660d52835..62a08318b1a2 100644
--- a/velox/dwio/common/tests/CMakeLists.txt
+++ b/velox/dwio/common/tests/CMakeLists.txt
@@ -75,14 +75,20 @@ target_link_libraries(
   ZLIB::ZLIB
   ${TEST_LINK_LIBS})
 
-if(VELOX_ENABLE_ARROW)
+if(VELOX_ENABLE_ARROW AND VELOX_ENABLE_BENCHMARKS)
+  add_subdirectory(Lemire/FastPFor)
   add_executable(velox_dwio_common_bitpack_decoder_benchmark
-                 BitPackDecoderBenchmark.cpp duckdb/FastpforLib.cpp)
+                 BitPackDecoderBenchmark.cpp)
 
   target_compile_options(velox_dwio_common_bitpack_decoder_benchmark
                          PRIVATE -Wno-deprecated-declarations)
 
   target_link_libraries(
-    velox_dwio_common_bitpack_decoder_benchmark velox_dwio_common arrow
-    duckdb_static Folly::folly ${FOLLY_BENCHMARK})
+    velox_dwio_common_bitpack_decoder_benchmark
+    velox_dwio_common
+    arrow
+    velox_fastpforlib
+    duckdb_static
+    Folly::folly
+    ${FOLLY_BENCHMARK})
 endif()
diff --git a/velox/dwio/common/tests/Lemire/FastPFor/CMakeLists.txt b/velox/dwio/common/tests/Lemire/FastPFor/CMakeLists.txt
new file mode 100644
index 000000000000..5f6ff7652e32
--- /dev/null
+++ b/velox/dwio/common/tests/Lemire/FastPFor/CMakeLists.txt
@@ -0,0 +1,17 @@
+# 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.
+add_library(velox_fastpforlib STATIC bitpacking.cpp)
+
+target_include_directories(
+  velox_fastpforlib PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
diff --git a/velox/dwio/common/tests/Lemire/FastPFor/LICENSE b/velox/dwio/common/tests/Lemire/FastPFor/LICENSE
new file mode 100644
index 000000000000..8405e89a0b12
--- /dev/null
+++ b/velox/dwio/common/tests/Lemire/FastPFor/LICENSE
@@ -0,0 +1,191 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and
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+"Work" shall mean the work of authorship, whether in Source or Object form, made
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+of whom a Contribution has been received by Licensor and subsequently
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+6. Trademarks.
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+This License does not grant permission to use the trade names, trademarks,
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+
+7. Disclaimer of Warranty.
+
+Unless required by applicable law or agreed to in writing, Licensor provides the
+Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
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+In no event and under no legal theory, whether in tort (including negligence),
+contract, or otherwise, unless required by applicable law (such as deliberate
+and grossly negligent acts) or agreed to in writing, shall any Contributor be
+liable to You for damages, including any direct, indirect, special, incidental,
+or consequential damages of any character arising as a result of this License or
+out of the use or inability to use the Work (including but not limited to
+damages for loss of goodwill, work stoppage, computer failure or malfunction, or
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+in accepting such obligations, You may act only on Your own behalf and on Your
+sole responsibility, not on behalf of any other Contributor, and only if You
+agree to indemnify, defend, and hold each Contributor harmless for any liability
+incurred by, or claims asserted against, such Contributor by reason of your
+accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work
+
+To apply the Apache License to your work, attach the following boilerplate
+notice, with the fields enclosed by brackets "[]" replaced with your own
+identifying information. (Don't include the brackets!) The text should be
+enclosed in the appropriate comment syntax for the file format. We also
+recommend that a file or class name and description of purpose be included on
+the same "printed page" as the copyright notice for easier identification within
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+   Copyright [yyyy] [name of copyright owner]
+
+   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
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\ No newline at end of file
diff --git a/velox/dwio/common/tests/duckdb/FastpforLib.cpp b/velox/dwio/common/tests/Lemire/FastPFor/bitpacking.cpp
similarity index 98%
rename from velox/dwio/common/tests/duckdb/FastpforLib.cpp
rename to velox/dwio/common/tests/Lemire/FastPFor/bitpacking.cpp
index c75d2ed21114..5bc1d37ade2e 100644
--- a/velox/dwio/common/tests/duckdb/FastpforLib.cpp
+++ b/velox/dwio/common/tests/Lemire/FastPFor/bitpacking.cpp
@@ -1,23 +1,14 @@
-/*
- * 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.
- */
+/**
+* This code is released under the
+* Apache License Version 2.0 http://www.apache.org/licenses/.
+*
+* (c) Daniel Lemire, http://lemire.me/en/
+*/
 
 #include <cstdint>
 #include <type_traits>
 
-namespace duckdb_fastpforlib {
+namespace velox::fastpforlib {
 namespace internal {
 
 // Used for uint8_t, uint16_t and uint32_t
diff --git a/velox/dwio/common/tests/Lemire/FastPFor/bitpacking.h b/velox/dwio/common/tests/Lemire/FastPFor/bitpacking.h
new file mode 100644
index 000000000000..e1675eb24712
--- /dev/null
+++ b/velox/dwio/common/tests/Lemire/FastPFor/bitpacking.h
@@ -0,0 +1,294 @@
+/*
+ * 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.
+ */
+/**
+ * This code is released under the
+ * Apache License Version 2.0 http://www.apache.org/licenses/.
+ *
+ * (c) Daniel Lemire, http://lemire.me/en/
+ */
+
+#pragma once
+#include <cinttypes>
+#include <string>
+
+namespace velox::fastpforlib {
+namespace internal {
+
+// Unpacks 8 uint8_t values
+void __fastunpack0(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack1(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack2(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack3(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack4(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack5(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack6(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack7(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastunpack8(const uint8_t* __restrict in, uint8_t* __restrict out);
+
+// Unpacks 16 uint16_t values
+void __fastunpack0(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack1(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack2(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack3(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack4(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack5(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack6(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack7(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack8(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack9(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack10(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack11(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack12(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack13(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack14(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack15(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastunpack16(const uint16_t* __restrict in, uint16_t* __restrict out);
+
+// Unpacks 32 uint32_t values
+void __fastunpack0(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack1(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack2(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack3(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack4(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack5(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack6(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack7(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack8(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack9(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack10(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack11(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack12(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack13(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack14(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack15(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack16(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack17(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack18(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack19(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack20(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack21(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack22(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack23(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack24(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack25(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack26(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack27(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack28(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack29(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack30(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack31(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastunpack32(const uint32_t* __restrict in, uint32_t* __restrict out);
+
+// Unpacks 32 uint64_t values
+void __fastunpack0(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack1(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack2(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack3(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack4(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack5(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack6(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack7(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack8(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack9(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack10(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack11(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack12(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack13(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack14(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack15(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack16(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack17(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack18(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack19(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack20(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack21(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack22(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack23(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack24(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack25(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack26(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack27(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack28(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack29(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack30(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack31(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack32(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack33(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack34(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack35(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack36(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack37(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack38(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack39(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack40(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack41(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack42(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack43(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack44(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack45(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack46(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack47(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack48(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack49(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack50(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack51(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack52(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack53(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack54(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack55(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack56(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack57(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack58(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack59(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack60(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack61(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack62(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack63(const uint32_t* __restrict in, uint64_t* __restrict out);
+void __fastunpack64(const uint32_t* __restrict in, uint64_t* __restrict out);
+
+// Packs 8 int8_t values
+void __fastpack0(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack1(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack2(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack3(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack4(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack5(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack6(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack7(const uint8_t* __restrict in, uint8_t* __restrict out);
+void __fastpack8(const uint8_t* __restrict in, uint8_t* __restrict out);
+
+// Packs 16 int16_t values
+void __fastpack0(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack1(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack2(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack3(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack4(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack5(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack6(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack7(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack8(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack9(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack10(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack11(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack12(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack13(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack14(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack15(const uint16_t* __restrict in, uint16_t* __restrict out);
+void __fastpack16(const uint16_t* __restrict in, uint16_t* __restrict out);
+
+// Packs 32 int32_t values
+void __fastpack0(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack1(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack2(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack3(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack4(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack5(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack6(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack7(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack8(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack9(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack10(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack11(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack12(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack13(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack14(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack15(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack16(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack17(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack18(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack19(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack20(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack21(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack22(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack23(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack24(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack25(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack26(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack27(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack28(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack29(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack30(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack31(const uint32_t* __restrict in, uint32_t* __restrict out);
+void __fastpack32(const uint32_t* __restrict in, uint32_t* __restrict out);
+
+// Packs 32 int64_t values
+void __fastpack0(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack1(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack2(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack3(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack4(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack5(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack6(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack7(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack8(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack9(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack10(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack11(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack12(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack13(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack14(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack15(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack16(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack17(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack18(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack19(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack20(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack21(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack22(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack23(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack24(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack25(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack26(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack27(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack28(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack29(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack30(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack31(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack32(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack33(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack34(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack35(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack36(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack37(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack38(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack39(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack40(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack41(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack42(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack43(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack44(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack45(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack46(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack47(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack48(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack49(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack50(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack51(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack52(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack53(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack54(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack55(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack56(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack57(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack58(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack59(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack60(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack61(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack62(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack63(const uint64_t* __restrict in, uint32_t* __restrict out);
+void __fastpack64(const uint64_t* __restrict in, uint32_t* __restrict out);
+} // namespace internal
+} // namespace velox::fastpforlib
diff --git a/velox/dwio/common/tests/duckdb/FastpforLib.h b/velox/dwio/common/tests/Lemire/FastPFor/bitpackinghelpers.h
similarity index 50%
rename from velox/dwio/common/tests/duckdb/FastpforLib.h
rename to velox/dwio/common/tests/Lemire/FastPFor/bitpackinghelpers.h
index 010ad3564fc8..2e7ddbce9ca9 100644
--- a/velox/dwio/common/tests/duckdb/FastpforLib.h
+++ b/velox/dwio/common/tests/Lemire/FastPFor/bitpackinghelpers.h
@@ -1,288 +1,18 @@
-/*
- * 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.
- */
+/**
+* This code is released under the
+* Apache License Version 2.0 http://www.apache.org/licenses/.
+*
+* (c) Daniel Lemire, http://lemire.me/en/
+*/
 
-#include <cinttypes>
-#include <stdexcept>
-
-namespace duckdb_fastpforlib {
-namespace internal {
-
-// Unpacks 8 uint8_t values
-void __fastunpack0(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack1(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack2(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack3(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack4(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack5(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack6(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack7(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastunpack8(const uint8_t* __restrict in, uint8_t* __restrict out);
-
-// Unpacks 16 uint16_t values
-void __fastunpack0(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack1(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack2(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack3(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack4(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack5(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack6(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack7(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack8(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack9(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack10(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack11(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack12(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack13(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack14(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack15(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastunpack16(const uint16_t* __restrict in, uint16_t* __restrict out);
-
-// Unpacks 32 uint32_t values
-void __fastunpack0(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack1(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack2(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack3(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack4(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack5(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack6(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack7(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack8(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack9(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack10(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack11(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack12(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack13(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack14(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack15(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack16(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack17(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack18(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack19(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack20(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack21(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack22(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack23(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack24(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack25(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack26(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack27(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack28(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack29(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack30(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack31(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastunpack32(const uint32_t* __restrict in, uint32_t* __restrict out);
+#pragma once
+#include "bitpacking.h"
 
-// Unpacks 32 uint64_t values
-void __fastunpack0(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack1(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack2(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack3(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack4(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack5(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack6(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack7(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack8(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack9(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack10(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack11(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack12(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack13(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack14(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack15(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack16(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack17(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack18(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack19(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack20(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack21(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack22(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack23(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack24(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack25(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack26(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack27(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack28(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack29(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack30(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack31(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack32(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack33(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack34(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack35(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack36(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack37(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack38(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack39(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack40(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack41(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack42(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack43(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack44(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack45(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack46(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack47(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack48(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack49(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack50(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack51(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack52(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack53(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack54(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack55(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack56(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack57(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack58(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack59(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack60(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack61(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack62(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack63(const uint32_t* __restrict in, uint64_t* __restrict out);
-void __fastunpack64(const uint32_t* __restrict in, uint64_t* __restrict out);
-
-// Packs 8 int8_t values
-void __fastpack0(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack1(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack2(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack3(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack4(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack5(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack6(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack7(const uint8_t* __restrict in, uint8_t* __restrict out);
-void __fastpack8(const uint8_t* __restrict in, uint8_t* __restrict out);
-
-// Packs 16 int16_t values
-void __fastpack0(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack1(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack2(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack3(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack4(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack5(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack6(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack7(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack8(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack9(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack10(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack11(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack12(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack13(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack14(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack15(const uint16_t* __restrict in, uint16_t* __restrict out);
-void __fastpack16(const uint16_t* __restrict in, uint16_t* __restrict out);
+#include <stdexcept>
 
-// Packs 32 int32_t values
-void __fastpack0(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack1(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack2(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack3(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack4(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack5(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack6(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack7(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack8(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack9(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack10(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack11(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack12(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack13(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack14(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack15(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack16(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack17(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack18(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack19(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack20(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack21(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack22(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack23(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack24(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack25(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack26(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack27(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack28(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack29(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack30(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack31(const uint32_t* __restrict in, uint32_t* __restrict out);
-void __fastpack32(const uint32_t* __restrict in, uint32_t* __restrict out);
+namespace velox::fastpforlib {
 
-// Packs 32 int64_t values
-void __fastpack0(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack1(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack2(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack3(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack4(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack5(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack6(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack7(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack8(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack9(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack10(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack11(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack12(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack13(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack14(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack15(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack16(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack17(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack18(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack19(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack20(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack21(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack22(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack23(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack24(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack25(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack26(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack27(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack28(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack29(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack30(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack31(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack32(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack33(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack34(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack35(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack36(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack37(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack38(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack39(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack40(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack41(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack42(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack43(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack44(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack45(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack46(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack47(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack48(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack49(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack50(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack51(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack52(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack53(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack54(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack55(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack56(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack57(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack58(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack59(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack60(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack61(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack62(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack63(const uint64_t* __restrict in, uint32_t* __restrict out);
-void __fastpack64(const uint64_t* __restrict in, uint32_t* __restrict out);
+namespace internal {
 
 // Note that this only packs 8 values
 inline void fastunpack_quarter(
@@ -294,7 +24,7 @@ inline void fastunpack_quarter(
   // theory. In this case, it makes no difference with a good compiler.
   switch (bit) {
     case 0:
-      __fastunpack0(in, out);
+      internal::__fastunpack0(in, out);
       break;
     case 1:
       internal::__fastunpack1(in, out);
@@ -495,7 +225,6 @@ inline void fastpack_half(
       throw std::logic_error("Invalid bit width for bitpacking");
   }
 }
-
 } // namespace internal
 
 inline void fastunpack(
@@ -1168,4 +897,4 @@ inline void fastpack(
       throw std::logic_error("Invalid bit width for bitpacking");
   }
 }
-} // namespace duckdb_fastpforlib::internal
+} // namespace velox::fastpforlib