| // 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. | |
| namespace arrow::util::internal { | |
| class ARROW_TESTING_EXPORT NestedListGenerator { | |
| public: | |
| /// \brief Create a nested FixedSizeListType. | |
| /// | |
| /// \return `fixed_size_list(fixed_size_list(..., sizes[1]), sizes[0])` | |
| static std::shared_ptr<DataType> NestedFSLType( | |
| const std::shared_ptr<DataType>& inner_type, const std::vector<int>& sizes); | |
| /// \brief Create a nested FixedListType. | |
| /// | |
| /// \return `list(list(...))` | |
| static std::shared_ptr<DataType> NestedListType( | |
| const std::shared_ptr<DataType>& inner_type, size_t depth); | |
| static Result<std::shared_ptr<Array>> NestedFSLArray( | |
| const std::shared_ptr<DataType>& inner_type, const std::vector<int>& list_sizes, | |
| int64_t length); | |
| static Result<std::shared_ptr<Array>> NestedListArray( | |
| const std::shared_ptr<DataType>& inner_type, const std::vector<int>& list_sizes, | |
| int64_t length); | |
| /// \brief Generate all possible nested list configurations of depth 1 to max_depth. | |
| /// | |
| /// Each configuration consists of a single inner value type and a list of sizes. | |
| /// Both can be used with NestedFSLArray and NestedListArray to generate test data. | |
| /// | |
| /// The product of the list sizes and the size of the inner value type is always a power | |
| /// of 2 no greater than max_power_of_2_size. For max_depth=3 and | |
| /// max_power_of_2_size=32, this generates 108 configurations. | |
| static void VisitAllNestedListConfigurations( | |
| const std::vector<std::shared_ptr<DataType>>& inner_value_types, | |
| const std::function<void(const std::shared_ptr<DataType>&, | |
| const std::vector<int>&)>& visit, | |
| int max_depth = 3, int max_power_of_2_size = 32); | |
| private: | |
| // Append([...[[*next_inner_value++, *next_inner_value++, ...]]...]) | |
| static Status AppendNestedList(ArrayBuilder* nested_builder, const int* list_sizes, | |
| int64_t* next_inner_value); | |
| static Result<std::shared_ptr<Array>> NestedListArray( | |
| ArrayBuilder* nested_builder, const std::vector<int>& list_sizes, int64_t length); | |
| }; | |
| } // namespace arrow::util::internal | |