stayrascal commented on a change in pull request #4724: URL: https://github.com/apache/hudi/pull/4724#discussion_r811144363
########## File path: hudi-common/src/main/java/org/apache/hudi/common/model/PartialOverwriteWithLatestAvroPayload.java ########## @@ -0,0 +1,141 @@ +/* + * 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.common.model; + +import org.apache.hudi.common.util.Option; + +import org.apache.avro.Schema; +import org.apache.avro.generic.GenericRecord; +import org.apache.avro.generic.IndexedRecord; + +import java.io.IOException; +import java.util.List; +import java.util.Objects; + +import static org.apache.hudi.avro.HoodieAvroUtils.bytesToAvro; + +/** + * The only difference with {@link OverwriteNonDefaultsWithLatestAvroPayload} is that it supports + * merging the latest non-null partial fields with the old record instead of replacing the whole record. + * And merging the non-null fields during preCombine multiple records with same record key instead of choosing the latest record based on ordering field. + * + * <p> Regarding #combineAndGetUpdateValue, Assuming a {@link GenericRecord} has row schema: (f0 int , f1 int, f2 int). + * The first record value is: (1, 2, 3), the second record value is: (4, 5, null) with the field f2 value as null. + * Calling the #combineAndGetUpdateValue method of the two records returns record: (4, 5, 3). + * Note that field f2 value is ignored because it is null. </p> + * + * <p> Regarding #preCombine, Assuming a {@link GenericRecord} has row schema: (f0 int , f1 int, f2 int, o1 int), + * and initial two {@link PartialOverwriteWithLatestAvroPayload} with different ordering value. + * The first record value is (1, null, 1, 1) with the filed f1 value as null, the second value is: (2, 2, null, 2) with the f2 value as null. + * Calling the #preCombine method of the two records returns record: (2, 2, 1, 2). + * Note: + * <ol> + * <li>the field f0 value is 2 because the ordering value of second record is bigger.</li> + * <li>the filed f1 value is 2 because the f2 value of first record is null.</li> + * <li>the filed f2 value is 1 because the f2 value of second record is null.</li> + * <li>the filed o1 value is 2 because the ordering value of second record is bigger.</li> + * </ol> + * + * </p> + */ +public class PartialOverwriteWithLatestAvroPayload extends OverwriteWithLatestAvroPayload { + + public PartialOverwriteWithLatestAvroPayload(GenericRecord record, Comparable orderingVal) { + this(record, orderingVal, null); + } + + public PartialOverwriteWithLatestAvroPayload(GenericRecord record, Comparable orderingVal, String schema) { + super(record, orderingVal, schema); + } + + public PartialOverwriteWithLatestAvroPayload(Option<GenericRecord> record) { + super(record); // natural order + } + + @Override + public Option<IndexedRecord> combineAndGetUpdateValue(IndexedRecord currentValue, Schema schema) throws IOException { + if (recordBytes.length == 0) { + return Option.empty(); + } + + GenericRecord incomingRecord = bytesToAvro(recordBytes, schema); + if (isDeleteRecord(incomingRecord)) { + return Option.empty(); + } + + GenericRecord currentRecord = (GenericRecord) currentValue; + List<Schema.Field> fields = schema.getFields(); + fields.forEach(field -> { + Object value = incomingRecord.get(field.name()); + if (Objects.nonNull(value)) { + currentRecord.put(field.name(), value); + } + }); + + return Option.of(currentRecord); + } + + @Override + public int compareTo(OverwriteWithLatestAvroPayload oldValue) { + return orderingVal.compareTo(oldValue.orderingVal); + } + + @Override + public OverwriteWithLatestAvroPayload preCombine(OverwriteWithLatestAvroPayload oldValue) { Review comment: Hi @nsivabalan , thanks a lot for review this. Regarding adding new `preCombine` method with `Schema`, I considered this, but it means that the method caller who need to get the schema info at first, and currently, it seems that we only can get the schema info from Configuration(from `hoodie.avro.schema` field). Sometimes, the caller might hard to get the schema info, Especially for `FlinkWriteHeler.deduplicateRecords(List<HoodieRecord<T>> records, HoodieIndex<?, ?> index, int parallelism)`. But compare the performance, it seems that passing the schema in method might be a better approach. BTW, since we already have had the method `preCombine(T oldValue, Properties properties)`, how about put the schema string in properties, and then parse the schema string to Schema later, so that we don't need to create a new method any more. otherwise, I cannot image when will we will `Properties`. -- This is an automated message from the Apache Git Service. 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