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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. // Tools for dictionaries in IPC context #pragma once #include #include #include #include #include "arrow/result.h" #include "arrow/status.h" #include "arrow/type_fwd.h" #include "arrow/util/macros.h" #include "arrow/util/visibility.h" namespace arrow { namespace ipc { namespace internal { class FieldPosition { public: FieldPosition() : parent_(NULLPTR), index_(-1), depth_(0) {} FieldPosition child(int index) const { return {this, index}; } std::vector path() const { std::vector path(depth_); const FieldPosition* cur = this; for (int i = depth_ - 1; i >= 0; --i) { path[i] = cur->index_; cur = cur->parent_; } return path; } protected: FieldPosition(const FieldPosition* parent, int index) : parent_(parent), index_(index), depth_(parent->depth_ + 1) {} const FieldPosition* parent_; int index_; int depth_; }; } // namespace internal /// \brief Map fields in a schema to dictionary ids /// /// The mapping is structural, i.e. the field path (as a vector of indices) /// is associated to the dictionary id. A dictionary id may be associated /// to multiple fields. class ARROW_EXPORT DictionaryFieldMapper { public: DictionaryFieldMapper(); explicit DictionaryFieldMapper(const Schema& schema); ~DictionaryFieldMapper(); Status AddSchemaFields(const Schema& schema); Status AddField(int64_t id, std::vector field_path); Result GetFieldId(std::vector field_path) const; int num_fields() const; /// \brief Returns number of unique dictionaries, taking into /// account that different fields can share the same dictionary. int num_dicts() const; private: struct Impl; std::unique_ptr impl_; }; using DictionaryVector = std::vector>>; /// \brief Memoization data structure for reading dictionaries from IPC streams /// /// This structure tracks the following associations: /// - field position (structural) -> dictionary id /// - dictionary id -> value type /// - dictionary id -> dictionary (value) data /// /// Together, they allow resolving dictionary data when reading an IPC stream, /// using metadata recorded in the schema message and data recorded in the /// dictionary batch messages (see ResolveDictionaries). /// /// This structure isn't useful for writing an IPC stream, where only /// DictionaryFieldMapper is necessary. class ARROW_EXPORT DictionaryMemo { public: DictionaryMemo(); ~DictionaryMemo(); DictionaryFieldMapper& fields(); const DictionaryFieldMapper& fields() const; /// \brief Return current dictionary corresponding to a particular /// id. Returns KeyError if id not found Result> GetDictionary(int64_t id, MemoryPool* pool) const; /// \brief Return dictionary value type corresponding to a /// particular dictionary id. Result> GetDictionaryType(int64_t id) const; /// \brief Return true if we have a dictionary for the input id bool HasDictionary(int64_t id) const; /// \brief Add a dictionary value type to the memo with a particular id. /// Returns KeyError if a different type is already registered with the same id. Status AddDictionaryType(int64_t id, const std::shared_ptr& type); /// \brief Add a dictionary to the memo with a particular id. Returns /// KeyError if that dictionary already exists Status AddDictionary(int64_t id, const std::shared_ptr& dictionary); /// \brief Append a dictionary delta to the memo with a particular id. Returns /// KeyError if that dictionary does not exists Status AddDictionaryDelta(int64_t id, const std::shared_ptr& dictionary); /// \brief Add a dictionary to the memo if it does not have one with the id, /// otherwise, replace the dictionary with the new one. /// /// Return true if the dictionary was added, false if replaced. Result AddOrReplaceDictionary(int64_t id, const std::shared_ptr& dictionary); private: struct Impl; std::unique_ptr impl_; }; // For writing: collect dictionary entries to write to the IPC stream, in order // (i.e. inner dictionaries before dependent outer dictionaries). ARROW_EXPORT Result CollectDictionaries(const RecordBatch& batch, const DictionaryFieldMapper& mapper); // For reading: resolve all dictionaries in columns, according to the field // mapping and dictionary arrays stored in memo. // Columns may be sparse, i.e. some entries may be left null // (e.g. if an inclusion mask was used). ARROW_EXPORT Status ResolveDictionaries(const ArrayDataVector& columns, const DictionaryMemo& memo, MemoryPool* pool); namespace internal { // Like CollectDictionaries above, but uses the memo's DictionaryFieldMapper // and all collected dictionaries are added to the memo using AddDictionary. // // This is used as a shortcut in some roundtripping tests (to avoid emitting // any actual dictionary batches). ARROW_EXPORT Status CollectDictionaries(const RecordBatch& batch, DictionaryMemo* memo); } // namespace internal } // namespace ipc } // namespace arrow