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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. | ||
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| #pragma once | ||
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| #include <cstddef> | ||
| #include <cstdint> | ||
| #include <memory> | ||
| #include <vector> | ||
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| #include "arrow/array/builder_primitive.h" | ||
| #include "arrow/builder.h" | ||
| #include "arrow/type.h" | ||
| #include "arrow/util/checked_cast.h" | ||
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| namespace arrow::util::internal { | ||
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| class 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) { | ||
| auto fsl_type = fixed_size_list(inner_type, sizes[0]); | ||
| for (size_t i = 1; i < sizes.size(); i++) { | ||
| fsl_type = fixed_size_list(std::move(fsl_type), sizes[i]); | ||
| } | ||
| return fsl_type; | ||
| } | ||
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| /// \brief Create a nested FixedListType. | ||
| /// | ||
| /// \return `list(list(...))` | ||
| static std::shared_ptr<DataType> NestedListType( | ||
| const std::shared_ptr<DataType>& inner_type, size_t depth) { | ||
| auto list_type = list(inner_type); | ||
| for (size_t i = 1; i < depth; i++) { | ||
| list_type = list(std::move(list_type)); | ||
| } | ||
| return list_type; | ||
| } | ||
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| private: | ||
| template <typename ArrowType> | ||
| static Status AppendNumeric(ArrayBuilder* builder, int64_t* next_value) { | ||
| using NumericBuilder = ::arrow::NumericBuilder<ArrowType>; | ||
| using value_type = typename NumericBuilder::value_type; | ||
| auto* numeric_builder = ::arrow::internal::checked_cast<NumericBuilder*>(builder); | ||
| auto cast_next_value = | ||
| static_cast<value_type>(*next_value % std::numeric_limits<value_type>::max()); | ||
| RETURN_NOT_OK(numeric_builder->Append(cast_next_value)); | ||
| *next_value += 1; | ||
| return Status::OK(); | ||
| } | ||
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| // Append([...[[*next_inner_value++, *next_inner_value++, ...]]...]) | ||
| static Status AppendNestedList(ArrayBuilder* nested_builder, const int* list_sizes, | ||
| int64_t* next_inner_value) { | ||
| using ::arrow::internal::checked_cast; | ||
| ArrayBuilder* builder = nested_builder; | ||
| auto type = builder->type(); | ||
| if (type->id() == Type::FIXED_SIZE_LIST || type->id() == Type::LIST) { | ||
| const int list_size = *list_sizes; | ||
| if (type->id() == Type::FIXED_SIZE_LIST) { | ||
| auto* fsl_builder = checked_cast<FixedSizeListBuilder*>(builder); | ||
| assert(list_size == checked_cast<FixedSizeListType&>(*type).list_size()); | ||
| RETURN_NOT_OK(fsl_builder->Append()); | ||
| builder = fsl_builder->value_builder(); | ||
| } else { // type->id() == Type::LIST) | ||
| auto* list_builder = checked_cast<ListBuilder*>(builder); | ||
| RETURN_NOT_OK(list_builder->Append(/*is_valid=*/true, list_size)); | ||
| builder = list_builder->value_builder(); | ||
| } | ||
| for (int i = 0; i < list_size; i++) { | ||
| RETURN_NOT_OK(AppendNestedList(builder, list_sizes + 1, next_inner_value)); | ||
| } | ||
| } else { | ||
| switch (type->id()) { | ||
| case Type::INT8: | ||
| RETURN_NOT_OK(AppendNumeric<Int8Type>(builder, next_inner_value)); | ||
| break; | ||
| case Type::INT16: | ||
| RETURN_NOT_OK(AppendNumeric<Int16Type>(builder, next_inner_value)); | ||
| break; | ||
| case Type::INT32: | ||
| RETURN_NOT_OK(AppendNumeric<Int32Type>(builder, next_inner_value)); | ||
| break; | ||
| case Type::INT64: | ||
| RETURN_NOT_OK(AppendNumeric<Int64Type>(builder, next_inner_value)); | ||
| break; | ||
| default: | ||
| return Status::NotImplemented("Unsupported type: ", *type); | ||
| } | ||
| } | ||
| return Status::OK(); | ||
| } | ||
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| static Result<std::shared_ptr<Array>> NestedListArray( | ||
| ArrayBuilder* nested_builder, const std::vector<int>& list_sizes, int64_t length) { | ||
| int64_t next_inner_value = 0; | ||
| for (int64_t i = 0; i < length; i++) { | ||
| RETURN_NOT_OK( | ||
| AppendNestedList(nested_builder, list_sizes.data(), &next_inner_value)); | ||
| } | ||
| return nested_builder->Finish(); | ||
| } | ||
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| public: | ||
| static Result<std::shared_ptr<Array>> NestedFSLArray( | ||
| const std::shared_ptr<DataType>& inner_type, const std::vector<int>& list_sizes, | ||
| int64_t length) { | ||
| auto nested_type = NestedFSLType(inner_type, list_sizes); | ||
| ARROW_ASSIGN_OR_RAISE(auto builder, MakeBuilder(nested_type)); | ||
| return NestedListArray(builder.get(), list_sizes, length); | ||
| } | ||
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| static Result<std::shared_ptr<Array>> NestedListArray( | ||
| const std::shared_ptr<DataType>& inner_type, const std::vector<int>& list_sizes, | ||
| int64_t length) { | ||
| auto nested_type = NestedListType(inner_type, list_sizes.size()); | ||
| ARROW_ASSIGN_OR_RAISE(auto builder, MakeBuilder(nested_type)); | ||
| return NestedListArray(builder.get(), list_sizes, length); | ||
| } | ||
| }; | ||
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| } // namespace arrow::util::internal |