lszskye commented on code in PR #364: URL: https://github.com/apache/paimon-cpp/pull/364#discussion_r4055778330
########## src/paimon/common/utils/optimized_roaring_bitmap64.h: ########## @@ -0,0 +1,115 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 file is based on source code from the Iceberg Project (http://iceberg.apache.org/), + * licensed by the Apache Software Foundation (ASF) under the Apache License, Version 2.0. See the + * NOTICE file distributed with this work for additional information regarding copyright + * ownership. */ + +#pragma once + +#include <cstddef> +#include <cstdint> +#include <functional> +#include <limits> +#include <memory> + +#include "paimon/io/byte_array_input_stream.h" +#include "paimon/memory/bytes.h" +#include "paimon/memory/memory_pool.h" +#include "paimon/result.h" +#include "paimon/status.h" +#include "paimon/utils/roaring_bitmap32.h" + +namespace paimon { + +/// A bitmap for non-negative 64-bit positions that uses the high 32 bits as an array index +/// and stores the low 32 bits in a 32-bit Roaring bitmap. +/// +/// This layout is compatible with Java Paimon's `OptimizedRoaringBitmap64` and is optimized for +/// positions whose high 32 bits are small, in particular file-local row positions. +class OptimizedRoaringBitmap64 { + public: + static constexpr int64_t kMaxValue = + (static_cast<int64_t>(std::numeric_limits<int32_t>::max() - 1) << 32) | + static_cast<uint32_t>(std::numeric_limits<int32_t>::min()); + + OptimizedRoaringBitmap64(); + ~OptimizedRoaringBitmap64(); + + OptimizedRoaringBitmap64(const OptimizedRoaringBitmap64& other); + OptimizedRoaringBitmap64& operator=(const OptimizedRoaringBitmap64& other); + + OptimizedRoaringBitmap64(OptimizedRoaringBitmap64&& other) noexcept; + OptimizedRoaringBitmap64& operator=(OptimizedRoaringBitmap64&& other) noexcept; + + /// Create an optimized 64-bit bitmap containing all positions from a 32-bit bitmap. + static OptimizedRoaringBitmap64 FromRoaringBitmap32(const RoaringBitmap32& bitmap); + + /// Add a position. + Status Add(int64_t position); + + /// Add all positions in the half-open interval [start, end). + Status AddRange(int64_t start, int64_t end); + + /// Union another bitmap into this bitmap. + OptimizedRoaringBitmap64& operator|=(const OptimizedRoaringBitmap64& other); + + /// Return whether the bitmap contains a position. + Result<bool> Contains(int64_t position) const; + + /// Return whether the bitmap is empty. + bool IsEmpty() const; + + /// Return the number of positions in the bitmap. + int64_t Cardinality() const; + + /// Apply run-length encoding to inner bitmaps when it is more space efficient. + bool RunLengthEncode(); + + /// Visit positions in ascending order. + void ForEach(const std::function<void(int64_t)>& consumer) const; + + /// Return the number of allocated inner 32-bit bitmaps. + size_t GetAllocatedBitmapCount() const; + + /// Return the number of bytes required by the portable serialized form. + size_t GetSizeInBytes() const; + + /// Serialize using the Java-compatible little-endian portable format. + PAIMON_UNIQUE_PTR<Bytes> Serialize(MemoryPool* pool) const; + + /// Deserialize from the current position of an input stream. + Status Deserialize(ByteArrayInputStream* input_stream); + + /// Deserialize from a buffer. + Status Deserialize(const char* begin, size_t length); + + bool operator==(const OptimizedRoaringBitmap64& other) const noexcept; + + private: + class Impl; + + static Status CheckPosition(int64_t position); + void AllocateBitmapsIfNeeded(size_t required_length); + + std::unique_ptr<Impl> impl_; Review Comment: Actually, `OptimizedRoaringBitmap64 ` will not expose in the header file, I'll fix this. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
