Shekharrajak commented on code in PR #19266: URL: https://github.com/apache/druid/pull/19266#discussion_r3259726270
########## extensions-contrib/druid-iceberg-extensions/src/main/java/org/apache/druid/iceberg/input/IcebergNativeRecordReader.java: ########## @@ -0,0 +1,355 @@ +/* + * 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.druid.iceberg.input; + +import org.apache.druid.data.input.InputRow; +import org.apache.druid.data.input.InputRowListPlusRawValues; +import org.apache.druid.data.input.InputRowSchema; +import org.apache.druid.data.input.InputSourceFactory; +import org.apache.druid.data.input.InputSourceReader; +import org.apache.druid.data.input.InputStats; +import org.apache.druid.data.input.impl.MapInputRowParser; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.java.util.common.parsers.CloseableIterator; +import org.apache.hadoop.conf.Configuration; +import org.apache.iceberg.CatalogUtil; +import org.apache.iceberg.Schema; +import org.apache.iceberg.SchemaParser; +import org.apache.iceberg.data.Record; +import org.apache.iceberg.data.parquet.GenericParquetReaders; +import org.apache.iceberg.hadoop.HadoopFileIO; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.DeleteSchemaUtil; +import org.apache.iceberg.io.FileIO; +import org.apache.iceberg.io.InputFile; +import org.apache.iceberg.parquet.Parquet; +import org.apache.iceberg.types.Types; + +import javax.annotation.Nullable; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.NoSuchElementException; +import java.util.Set; + +/** + * An {@link InputSourceReader} that reads an Iceberg data file and applies + * associated positional and equality delete files before converting records + * to Druid {@link InputRow} objects. + * + * Delete application follows the Iceberg v2 spec: + * <ol> + * <li>Positional deletes: read (file_path, pos) pairs, filter by current data file, + * build a Set of deleted positions</li> + * <li>Equality deletes: read key tuples from equality delete files, build Sets + * of deleted key values per equality field set</li> + * <li>Stream data file: for each record, skip if position-deleted or equality-deleted</li> + * </ol> + * + * All reads use Iceberg's Parquet reader with {@link GenericParquetReaders} for + * schema-aware reading. Files are accessed via Hadoop {@link Configuration}. + */ +public class IcebergNativeRecordReader implements InputSourceReader +{ + private static final Logger log = new Logger(IcebergNativeRecordReader.class); + + private final String dataFilePath; + private final List<DeleteFileInfo> deleteFiles; + private final String tableSchemaJson; + private final InputSourceFactory warehouseSource; + private final InputRowSchema inputRowSchema; + private final Configuration hadoopConf; + private final FileIO fileIO; + + public IcebergNativeRecordReader( + final String dataFilePath, + final List<DeleteFileInfo> deleteFiles, + final String tableSchemaJson, + final InputSourceFactory warehouseSource, + final InputRowSchema inputRowSchema, + @Nullable final String fileIOImpl, + @Nullable final Map<String, String> fileIOProperties + ) + { + this.dataFilePath = dataFilePath; + this.deleteFiles = deleteFiles; + this.tableSchemaJson = tableSchemaJson; + this.warehouseSource = warehouseSource; + this.inputRowSchema = inputRowSchema; + this.hadoopConf = new Configuration(); + this.fileIO = buildFileIO(fileIOImpl, fileIOProperties, hadoopConf); + } + + private static FileIO buildFileIO( + @Nullable final String fileIOImpl, + @Nullable final Map<String, String> fileIOProperties, + final Configuration hadoopConf + ) + { + final Map<String, String> props = fileIOProperties == null ? Collections.emptyMap() : fileIOProperties; + if (fileIOImpl == null || fileIOImpl.isEmpty()) { + return new HadoopFileIO(hadoopConf); + } + return CatalogUtil.loadFileIO(fileIOImpl, props, hadoopConf); + } + + @Override + public CloseableIterator<InputRow> read(final InputStats inputStats) throws IOException + { + final Schema tableSchema = SchemaParser.fromJson(tableSchemaJson); + + // Step 1: Collect positional deletes + final Set<Long> deletedPositions = collectPositionalDeletes(); + + // Step 2: Collect equality deletes + final List<EqualityDeleteSet> equalityDeleteSets = collectEqualityDeletes(tableSchema); + + // Step 3: Stream data file with delete application + final InputFile dataInputFile = fileIO.newInputFile(dataFilePath); + final CloseableIterable<Record> records = Parquet.read(dataInputFile) Review Comment: Let me document for parquet only and follow up PR will add it : https://github.com/apache/druid/issues/19472 -- This is an automated message from the Apache Git Service. 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