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// 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. #pragma once #include #include #include #include "arrow/io/caching.h" #include "arrow/ipc/type_fwd.h" #include "arrow/status.h" #include "arrow/type_fwd.h" #include "arrow/util/align_util.h" #include "arrow/util/compression.h" #include "arrow/util/visibility.h" namespace arrow { class MemoryPool; namespace ipc { // ARROW-109: We set this number arbitrarily to help catch user mistakes. For // deeply nested schemas, it is expected the user will indicate explicitly the // maximum allowed recursion depth constexpr int kMaxNestingDepth = 64; /// \brief Options for writing Arrow IPC messages struct ARROW_EXPORT IpcWriteOptions { /// \brief If true, allow field lengths that don't fit in a signed 32-bit int. /// /// Some implementations may not be able to parse streams created with this option. bool allow_64bit = false; /// \brief The maximum permitted schema nesting depth. int max_recursion_depth = kMaxNestingDepth; /// \brief Write padding after memory buffers up to this multiple of bytes. int32_t alignment = 8; /// \brief Write the pre-0.15.0 IPC message format /// /// This legacy format consists of a 4-byte prefix instead of 8-byte. bool write_legacy_ipc_format = false; /// \brief The memory pool to use for allocations made during IPC writing /// /// While Arrow IPC is predominantly zero-copy, it may have to allocate /// memory in some cases (for example if compression is enabled). MemoryPool* memory_pool = default_memory_pool(); /// \brief Compression codec to use for record batch body buffers /// /// May only be UNCOMPRESSED, LZ4_FRAME and ZSTD. std::shared_ptr codec; /// \brief Minimum space savings percentage required for compression to be applied /// /// Space savings is calculated as (1.0 - compressed_size / uncompressed_size). /// /// For example, if min_space_savings = 0.1, a 100-byte body buffer won't undergo /// compression if its expected compressed size exceeds 90 bytes. If this option is /// unset, compression will be used indiscriminately. If no codec was supplied, this /// option is ignored. /// /// Values outside of the range [0,1] are handled as errors. /// /// Note that enabling this option may result in unreadable data for Arrow C++ versions /// prior to 12.0.0. std::optional min_space_savings; /// \brief Use global CPU thread pool to parallelize any computational tasks /// like compression bool use_threads = true; /// \brief Whether to emit dictionary deltas /// /// If false, a changed dictionary for a given field will emit a full /// dictionary replacement. /// If true, a changed dictionary will be compared against the previous /// version. If possible, a dictionary delta will be emitted, otherwise /// a full dictionary replacement. /// /// Default is false to maximize stream compatibility. /// /// Also, note that if a changed dictionary is a nested dictionary, /// then a delta is never emitted, for compatibility with the read path. bool emit_dictionary_deltas = false; /// \brief Whether to unify dictionaries for the IPC file format /// /// The IPC file format doesn't support dictionary replacements. /// Therefore, chunks of a column with a dictionary type must have the same /// dictionary in each record batch (or an extended dictionary + delta). /// /// If this option is true, RecordBatchWriter::WriteTable will attempt /// to unify dictionaries across each table column. If this option is /// false, incompatible dictionaries across a table column will simply /// raise an error. /// /// Note that enabling this option has a runtime cost. Also, not all types /// currently support dictionary unification. /// /// This option is ignored for IPC streams, which support dictionary replacement /// and deltas. bool unify_dictionaries = false; /// \brief Format version to use for IPC messages and their metadata. /// /// Presently using V5 version (readable by 1.0.0 and later). /// V4 is also available (readable by 0.8.0 and later). MetadataVersion metadata_version = MetadataVersion::V5; static IpcWriteOptions Defaults(); }; /// \brief Alignment of data in memory /// Alignment values larger than 0 are taken directly as byte alignment value /// See util::EnsureAlignment(..., int64_t alignment, ...) enum class Alignment : int64_t { /// \brief data is aligned depending on the actual data type kDataTypeSpecificAlignment = util::kValueAlignment, /// \brief no particular alignment enforced kAnyAlignment = 0, /// \brief data is aligned to 64-byte boundary k64ByteAlignment = 64 }; /// \brief Options for reading Arrow IPC messages struct ARROW_EXPORT IpcReadOptions { /// \brief The maximum permitted schema nesting depth. int max_recursion_depth = kMaxNestingDepth; /// \brief The memory pool to use for allocations made during IPC reading /// /// While Arrow IPC is predominantly zero-copy, it may have to allocate /// memory in some cases (for example if compression is enabled). MemoryPool* memory_pool = default_memory_pool(); /// \brief Top-level schema fields to include when deserializing RecordBatch. /// /// If empty (the default), return all deserialized fields. /// If non-empty, the values are the indices of fields in the top-level schema. std::vector included_fields; /// \brief Use global CPU thread pool to parallelize any computational tasks /// like decompression bool use_threads = true; /// \brief Whether to convert incoming data to platform-native endianness /// /// If the endianness of the received schema is not equal to platform-native /// endianness, then all buffers with endian-sensitive data will be byte-swapped. /// This includes the value buffers of numeric types, temporal types, decimal /// types, as well as the offset buffers of variable-sized binary and list-like /// types. /// /// Endianness conversion is achieved by the RecordBatchFileReader, /// RecordBatchStreamReader and StreamDecoder classes. bool ensure_native_endian = true; /// \brief How to align data if mis-aligned /// /// Data is copied to aligned memory locations allocated via the /// MemoryPool configured as \ref arrow::ipc::IpcReadOptions::memory_pool. /// Some use cases might require data to have a specific alignment, for example, /// for the data buffer of an Int32 array to be aligned on a 4-byte boundary. /// /// Default (kAnyAlignment) keeps the alignment as is, so no copy of data occurs. Alignment ensure_alignment = Alignment::kAnyAlignment; /// \brief Options to control caching behavior when pre-buffering is requested /// /// The lazy property will always be reset to true to deliver the expected behavior io::CacheOptions pre_buffer_cache_options = io::CacheOptions::LazyDefaults(); static IpcReadOptions Defaults(); }; namespace internal { Status CheckCompressionSupported(Compression::type codec); } // namespace internal } // namespace ipc } // namespace arrow