| // 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. |
| |
| #ifndef PARQUET_SCHEMA_UTIL_H |
| #define PARQUET_SCHEMA_UTIL_H |
| |
| #include <string> |
| #include <unordered_set> |
| #include <vector> |
| |
| #include "parquet/exception.h" |
| #include "parquet/schema.h" |
| #include "parquet/types.h" |
| |
| using parquet::ParquetException; |
| using parquet::SchemaDescriptor; |
| using parquet::schema::GroupNode; |
| using parquet::schema::NodePtr; |
| using parquet::schema::Node; |
| using parquet::LogicalType; |
| |
| inline bool str_endswith_tuple(const std::string& str) { |
| if (str.size() >= 6) { |
| return str.substr(str.size() - 6, 6) == "_tuple"; |
| } |
| return false; |
| } |
| |
| // Special case mentioned in the format spec: |
| // If the name is array or ends in _tuple, this should be a list of struct |
| // even for single child elements. |
| inline bool HasStructListName(const GroupNode& node) { |
| return (node.name() == "array" || str_endswith_tuple(node.name())); |
| } |
| |
| // TODO(itaiin): This aux. function is to be deleted once repeated structs are supported |
| inline bool IsSimpleStruct(const Node* node) { |
| if (!node->is_group()) return false; |
| if (node->is_repeated()) return false; |
| if (node->logical_type() == LogicalType::LIST) return false; |
| // Special case mentioned in the format spec: |
| // If the name is array or ends in _tuple, this should be a list of struct |
| // even for single child elements. |
| auto group = static_cast<const GroupNode*>(node); |
| if (group->field_count() == 1 && HasStructListName(*group)) return false; |
| |
| return true; |
| } |
| |
| // Coalesce a list of schema fields indices which are the roots of the |
| // columns referred by a list of column indices |
| inline bool ColumnIndicesToFieldIndices(const SchemaDescriptor& descr, |
| const std::vector<int>& column_indices, |
| std::vector<int>* out) { |
| const GroupNode* group = descr.group_node(); |
| std::unordered_set<int> already_added; |
| out->clear(); |
| for (auto& column_idx : column_indices) { |
| auto field_node = descr.GetColumnRoot(column_idx); |
| auto field_idx = group->FieldIndex(field_node->name()); |
| if (field_idx < 0) { |
| return false; |
| } |
| auto insertion = already_added.insert(field_idx); |
| if (insertion.second) { |
| out->push_back(field_idx); |
| } |
| } |
| |
| return true; |
| } |
| |
| #endif // PARQUET_SCHEMA_UTIL_H |