yupeng9 commented on a change in pull request #6845: URL: https://github.com/apache/incubator-pinot/pull/6845#discussion_r622395863
########## File path: pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/ComplexTypeTransformer.java ########## @@ -0,0 +1,184 @@ +/** + * 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.pinot.segment.local.recordtransformer; + +import com.google.common.annotations.VisibleForTesting; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import javax.annotation.Nullable; +import org.apache.pinot.spi.config.table.TableConfig; +import org.apache.pinot.spi.config.table.ingestion.ComplexTypeHandlingConfig; +import org.apache.pinot.spi.data.readers.GenericRow; + + +public class ComplexTypeTransformer implements RecordTransformer { + private static final CharSequence DELIMITER = "."; + private final List<String> _collectionsToUnnest; + + public ComplexTypeTransformer(TableConfig tableConfig) { + if (tableConfig.getIngestionConfig() != null + && tableConfig.getIngestionConfig().getComplexTypeHandlingConfig() != null) { + _collectionsToUnnest = + tableConfig.getIngestionConfig().getComplexTypeHandlingConfig().getUnnestConfig() != null ? tableConfig + .getIngestionConfig().getComplexTypeHandlingConfig().getUnnestConfig() : new ArrayList<>(); + } else { + _collectionsToUnnest = new ArrayList<>(); + } + } + + @VisibleForTesting + public ComplexTypeTransformer(List<String> unnestCollections) { + _collectionsToUnnest = new ArrayList<>(unnestCollections); + Collections.sort(_collectionsToUnnest); + } + + public static boolean isComplexTypeHandlingEnabled(TableConfig tableConfig) { + if (tableConfig.getIngestionConfig() == null + || tableConfig.getIngestionConfig().getComplexTypeHandlingConfig() == null + || tableConfig.getIngestionConfig().getComplexTypeHandlingConfig().getMode() == null) { + return false; + } + return tableConfig.getIngestionConfig().getComplexTypeHandlingConfig().getMode() + != ComplexTypeHandlingConfig.Mode.NONE; + } + + @Nullable + @Override + public GenericRow transform(GenericRow record) { + flattenMap(record, new HashSet<>(record.getFieldToValueMap().keySet())); + for (String collection : _collectionsToUnnest) { + unnestCollection(record, collection); + } + return record; + } + + private GenericRow unnestCollection(GenericRow record, String column) { + if (record.getValue(GenericRow.MULTIPLE_RECORDS_KEY) == null) { + List<GenericRow> list = new ArrayList<>(); + unnestCollection(record, column, list); + record.putValue(GenericRow.MULTIPLE_RECORDS_KEY, list); + } else { + Collection<GenericRow> records = (Collection) record.getValue(GenericRow.MULTIPLE_RECORDS_KEY); + List<GenericRow> list = new ArrayList<>(); + for (GenericRow innerRecord : records) { + unnestCollection(innerRecord, column, list); + } + record.putValue(GenericRow.MULTIPLE_RECORDS_KEY, list); + } + return record; + } + + private void unnestCollection(GenericRow record, String column, List<GenericRow> list) { + Object value = record.removeValue(column); + if (value == null) { + // use the record itself + list.add(record); + return; + } else if (value instanceof Collection) { + if (((Collection) value).isEmpty()) { + // use the record itself + list.add(record); + } else { + for (Object obj : (Collection) value) { + GenericRow copy = flattenCollectionItem(record, obj, column); + list.add(copy); + } + } + } else if (value.getClass().isArray()) { + if (((Object[]) value).length == 0) { + // use the record itself + list.add(record); + } else { + for (Object obj : (Object[]) value) { + GenericRow copy = flattenCollectionItem(record, obj, column); + list.add(copy); + } Review comment: Good question. I think we dont have this explicit on array vs collection, based on my read of the decoder code. Currently, we always convert collections in source format into array. It's understandable coz today we need array to store primitives. However, for objects, IMO collections are preferred. e.g. https://stackoverflow.com/questions/13361489/differences-between-an-array-and-any-collection-from-the-java-collection-framewo -- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
