xiarixiaoyao commented on a change in pull request #3668: URL: https://github.com/apache/hudi/pull/3668#discussion_r717297644
########## File path: hudi-common/src/main/java/org/apache/hudi/internal/schema/utils/InternalSchemaUtils.java ########## @@ -0,0 +1,779 @@ +/* + * 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. + */ + +package org.apache.hudi.internal.schema.utils; + +import org.apache.avro.JsonProperties; +import org.apache.avro.LogicalType; +import org.apache.avro.LogicalTypes; +import org.apache.avro.Schema; +import org.apache.hudi.internal.schema.HoodieSchemaException; +import org.apache.hudi.internal.schema.InternalSchema; +import org.apache.hudi.internal.schema.Type; +import org.apache.hudi.internal.schema.Types; +import org.apache.hudi.internal.schema.Types.Field; +import org.apache.hudi.internal.schema.Types.RecordType; +import org.apache.hudi.internal.schema.action.MergeSchemaAction; + +import java.util.ArrayList; +import java.util.Deque; +import java.util.HashMap; +import java.util.HashSet; +import java.util.LinkedList; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Collectors; + +public class InternalSchemaUtils { + + private InternalSchemaUtils() { + } + + /** + * build a mapping from id to full field name for a internal Type. + * if a field y belong to a struct filed x, then the full name of y is x.y + * + * @param type hoodie internal type + * @return a mapping from id to full field name + */ + public static Map<Integer, String> buildIdToName(Type type) { + Map<Integer, String> result = new HashMap<>(); + buildNameToId(type).forEach((k, v) -> result.put(v, k)); + return result; + } + + /** + * build a mapping from full field name to id for a internal Type. + * if a field y belong to a struct filed x, then the full name of y is x.y + * + * @param type hoodie internal type + * @return a mapping from full field name to id + */ + public static Map<String, Integer> buildNameToId(Type type) { + Deque<String> fieldNames = new LinkedList<>(); + Map<String, Integer> nameToId = new HashMap<>(); + visitNameToId(type, fieldNames, nameToId); + return nameToId; + } + + /** + * build a mapping from id to field for a internal Type. + * + * @param type hoodie internal type + * @return a mapping from id to field + */ + public static Map<Integer, Field> buildIdToField(Type type) { + Map<Integer, Field> idToField = new HashMap<>(); + visitIdToField(type, idToField); + return idToField; + } + + private static void visitIdToField(Type type, Map<Integer, Field> index) { + switch (type.typeId()) { + case RECORD: + RecordType record = (RecordType) type; + for (Field field : record.fields()) { + visitIdToField(field.type(), index); + index.put(field.fieldId(), field); + } + return; + case ARRAY: + Types.ArrayType array = (Types.ArrayType) type; + visitIdToField(array.elementType(), index); + for (Field field : array.fields()) { + index.put(field.fieldId(), field); + } + return; + case MAP: + Types.MapType map = (Types.MapType) type; + visitIdToField(map.keyType(), index); + visitIdToField(map.valueType(), index); + for (Field field : map.fields()) { + index.put(field.fieldId(), field); + } + return; + default: + return; + } + } + + private static void visitNameToId(Type type, Deque<String> fieldNames, Map<String, Integer> nameToId) { Review comment: ok -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
