findepi commented on code in PR #10288: URL: https://github.com/apache/iceberg/pull/10288#discussion_r1639586779
########## spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/actions/NDVSketchGenerator.java: ########## @@ -0,0 +1,176 @@ +/* + * 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.iceberg.spark.actions; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.UUID; +import java.util.stream.Collectors; +import org.apache.datasketches.theta.CompactSketch; +import org.apache.datasketches.theta.SetOperationBuilder; +import org.apache.datasketches.theta.UpdateSketch; +import org.apache.iceberg.GenericBlobMetadata; +import org.apache.iceberg.GenericStatisticsFile; +import org.apache.iceberg.HasTableOperations; +import org.apache.iceberg.StatisticsFile; +import org.apache.iceberg.Table; +import org.apache.iceberg.TableOperations; +import org.apache.iceberg.io.FileIO; +import org.apache.iceberg.io.OutputFile; +import org.apache.iceberg.puffin.Blob; +import org.apache.iceberg.puffin.Puffin; +import org.apache.iceberg.puffin.PuffinWriter; +import org.apache.iceberg.puffin.StandardBlobTypes; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.types.Types; +import org.apache.spark.api.java.JavaPairRDD; +import org.apache.spark.api.java.function.Function2; +import org.apache.spark.sql.Column; +import org.apache.spark.sql.Dataset; +import org.apache.spark.sql.Row; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.sql.functions; +import org.apache.spark.sql.internal.SQLConf; +import scala.Tuple2; + +public class NDVSketchGenerator { + + private NDVSketchGenerator() {} + + static StatisticsFile generateNDV( + SparkSession spark, Table table, long snapshotId, String... columnsToBeAnalyzed) + throws IOException { + List<String> columnList; + if (columnsToBeAnalyzed == null || columnsToBeAnalyzed.length == 0) { + columnList = + table.schema().columns().stream() + .map(Types.NestedField::name) + .collect(Collectors.toList()); + } else { + columnList = Lists.newArrayList(columnsToBeAnalyzed); + } + Iterator<Tuple2<String, ThetaSketchJavaSerializable>> tuple2Iterator = + computeNDVSketches(spark, table.name(), snapshotId, columnList); + Map<String, ThetaSketchJavaSerializable> sketchMap = Maps.newHashMap(); + + tuple2Iterator.forEachRemaining(tuple -> sketchMap.put(tuple._1, tuple._2)); + return writeToPuffin(table, columnList, sketchMap); + } + + private static StatisticsFile writeToPuffin( + Table table, List<String> columns, Map<String, ThetaSketchJavaSerializable> sketchMap) + throws IOException { + TableOperations operations = ((HasTableOperations) table).operations(); + FileIO fileIO = operations.io(); + String path = operations.metadataFileLocation(String.format("%s.stats", UUID.randomUUID())); + OutputFile outputFile = fileIO.newOutputFile(path); + try (PuffinWriter writer = + Puffin.write(outputFile).createdBy("Iceberg Analyze action").build()) { + for (String columnName : columns) { + writer.add( + new Blob( Review Comment: thanks @szehon-ho for the ping there are couple potential issues - the blob needs to have `ndv` property - the sketch needs to be updated with the standard byte[] representation of values (`Conversions.toByteBuffer`) - there should be inter-op test https://github.com/apache/iceberg/pull/10288#discussion_r1639569349 - i am not exactly sure how what's the lifecycle of `ThetaSketchJavaSerializable` & whether this can impact the final results. need to re-read this portion -- This is an automated message from the Apache Git Service. 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