deniskuzZ commented on code in PR #12946: URL: https://github.com/apache/iceberg/pull/12946#discussion_r2070306082
########## core/src/main/java/org/apache/iceberg/PartitionStatsHandler.java: ########## @@ -0,0 +1,316 @@ +/* + * 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; + +import static org.apache.iceberg.TableProperties.DEFAULT_FILE_FORMAT; +import static org.apache.iceberg.TableProperties.DEFAULT_FILE_FORMAT_DEFAULT; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.Collection; +import java.util.Comparator; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Queue; +import java.util.UUID; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.FileAppender; +import org.apache.iceberg.io.InputFile; +import org.apache.iceberg.io.OutputFile; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Queues; +import org.apache.iceberg.types.Comparators; +import org.apache.iceberg.types.Types.IntegerType; +import org.apache.iceberg.types.Types.LongType; +import org.apache.iceberg.types.Types.NestedField; +import org.apache.iceberg.types.Types.StructType; +import org.apache.iceberg.util.PartitionMap; +import org.apache.iceberg.util.PartitionUtil; +import org.apache.iceberg.util.Tasks; +import org.apache.iceberg.util.ThreadPools; + +/** + * Computes, writes and reads the {@link PartitionStatisticsFile}. Uses generic readers and writers + * to support writing and reading of the stats in table default format. + */ +public class PartitionStatsHandler { + + private PartitionStatsHandler() {} + + public static final int PARTITION_FIELD_ID = 0; + public static final String PARTITION_FIELD_NAME = "partition"; + public static final NestedField SPEC_ID = NestedField.required(1, "spec_id", IntegerType.get()); + public static final NestedField DATA_RECORD_COUNT = + NestedField.required(2, "data_record_count", LongType.get()); + public static final NestedField DATA_FILE_COUNT = + NestedField.required(3, "data_file_count", IntegerType.get()); + public static final NestedField TOTAL_DATA_FILE_SIZE_IN_BYTES = + NestedField.required(4, "total_data_file_size_in_bytes", LongType.get()); + public static final NestedField POSITION_DELETE_RECORD_COUNT = + NestedField.optional(5, "position_delete_record_count", LongType.get()); + public static final NestedField POSITION_DELETE_FILE_COUNT = + NestedField.optional(6, "position_delete_file_count", IntegerType.get()); + public static final NestedField EQUALITY_DELETE_RECORD_COUNT = + NestedField.optional(7, "equality_delete_record_count", LongType.get()); + public static final NestedField EQUALITY_DELETE_FILE_COUNT = + NestedField.optional(8, "equality_delete_file_count", IntegerType.get()); + public static final NestedField TOTAL_RECORD_COUNT = + NestedField.optional(9, "total_record_count", LongType.get()); + public static final NestedField LAST_UPDATED_AT = + NestedField.optional(10, "last_updated_at", LongType.get()); + public static final NestedField LAST_UPDATED_SNAPSHOT_ID = + NestedField.optional(11, "last_updated_snapshot_id", LongType.get()); + + /** + * Generates the partition stats file schema based on a combined partition type which considers + * all specs in a table. + * + * @param unifiedPartitionType unified partition schema type. Could be calculated by {@link + * Partitioning#partitionType(Table)}. + * @return a schema that corresponds to the provided unified partition type. + */ + public static Schema schema(StructType unifiedPartitionType) { + Preconditions.checkState(!unifiedPartitionType.fields().isEmpty(), "Table must be partitioned"); + return new Schema( + NestedField.required(PARTITION_FIELD_ID, PARTITION_FIELD_NAME, unifiedPartitionType), + SPEC_ID, + DATA_RECORD_COUNT, + DATA_FILE_COUNT, + TOTAL_DATA_FILE_SIZE_IN_BYTES, + POSITION_DELETE_RECORD_COUNT, + POSITION_DELETE_FILE_COUNT, + EQUALITY_DELETE_RECORD_COUNT, + EQUALITY_DELETE_FILE_COUNT, + TOTAL_RECORD_COUNT, + LAST_UPDATED_AT, + LAST_UPDATED_SNAPSHOT_ID); + } + + /** + * Computes and writes the {@link PartitionStatisticsFile} for a given table's current snapshot. + * + * @param table The {@link Table} for which the partition statistics is computed. + * @return {@link PartitionStatisticsFile} for the current snapshot, or null if no statistics are + * present. + */ + public static PartitionStatisticsFile computeAndWriteStatsFile(Table table) throws IOException { + if (table.currentSnapshot() == null) { + return null; + } + + return computeAndWriteStatsFile(table, table.currentSnapshot().snapshotId()); + } + + /** + * Computes and writes the {@link PartitionStatisticsFile} for a given table and snapshot. + * + * @param table The {@link Table} for which the partition statistics is computed. + * @param snapshotId snapshot for which partition statistics are computed. + * @return {@link PartitionStatisticsFile} for the given snapshot, or null if no statistics are + * present. + */ + public static PartitionStatisticsFile computeAndWriteStatsFile(Table table, long snapshotId) + throws IOException { + Snapshot snapshot = table.snapshot(snapshotId); + Preconditions.checkArgument(snapshot != null, "Snapshot not found: %s", snapshotId); + + Collection<PartitionStats> stats = computeStats(table, snapshot); + if (stats.isEmpty()) { + return null; + } + + StructType partitionType = Partitioning.partitionType(table); + List<PartitionStats> sortedStats = sortStats(stats, partitionType); + return writePartitionStatsFile( + table, snapshot.snapshotId(), schema(partitionType), sortedStats); + } + + @VisibleForTesting + static PartitionStatisticsFile writePartitionStatsFile( + Table table, long snapshotId, Schema dataSchema, Iterable<PartitionStats> records) + throws IOException { + FileFormat fileFormat = + FileFormat.fromString( + table.properties().getOrDefault(DEFAULT_FILE_FORMAT, DEFAULT_FILE_FORMAT_DEFAULT)); + + OutputFile outputFile = newPartitionStatsFile(table, fileFormat, snapshotId); + + try (FileAppender<StructLike> writer = + InternalData.write(fileFormat, outputFile).schema(dataSchema).build()) { + records.iterator().forEachRemaining(writer::add); + } + + return ImmutableGenericPartitionStatisticsFile.builder() + .snapshotId(snapshotId) + .path(outputFile.location()) + .fileSizeInBytes(outputFile.toInputFile().getLength()) + .build(); + } + + /** + * Reads partition statistics from the specified {@link InputFile} using given schema. + * + * @param schema The {@link Schema} of the partition statistics file. + * @param inputFile An {@link InputFile} pointing to the partition stats file. + */ + public static CloseableIterable<PartitionStats> readPartitionStatsFile( + Schema schema, InputFile inputFile) { + FileFormat fileFormat = FileFormat.fromFileName(inputFile.location()); + Preconditions.checkArgument( + fileFormat != null, "Unable to determine format of file: %s", inputFile.location()); + + CloseableIterable<StructLike> records = + InternalData.read(fileFormat, inputFile).project(schema).build(); + return CloseableIterable.transform(records, PartitionStatsHandler::recordToPartitionStats); + } + + private static OutputFile newPartitionStatsFile( + Table table, FileFormat fileFormat, long snapshotId) { + Preconditions.checkArgument( + table instanceof HasTableOperations, + "Table must have operations to retrieve metadata location"); + + return table + .io() + .newOutputFile( + ((HasTableOperations) table) + .operations() + .metadataFileLocation( + fileFormat.addExtension( + String.format( + Locale.ROOT, "partition-stats-%d-%s", snapshotId, UUID.randomUUID())))); + } + + private static PartitionStats recordToPartitionStats(StructLike record) { + PartitionStats stats = + new PartitionStats( + record.get(PARTITION_FIELD_ID, StructLike.class), + record.get(SPEC_ID.fieldId(), Integer.class)); + stats.set(DATA_RECORD_COUNT.fieldId(), record.get(DATA_RECORD_COUNT.fieldId(), Long.class)); + stats.set(DATA_FILE_COUNT.fieldId(), record.get(DATA_FILE_COUNT.fieldId(), Integer.class)); + stats.set( + TOTAL_DATA_FILE_SIZE_IN_BYTES.fieldId(), + record.get(TOTAL_DATA_FILE_SIZE_IN_BYTES.fieldId(), Long.class)); + stats.set( + POSITION_DELETE_RECORD_COUNT.fieldId(), + record.get(POSITION_DELETE_RECORD_COUNT.fieldId(), Long.class)); + stats.set( + POSITION_DELETE_FILE_COUNT.fieldId(), + record.get(POSITION_DELETE_FILE_COUNT.fieldId(), Integer.class)); + stats.set( + EQUALITY_DELETE_RECORD_COUNT.fieldId(), + record.get(EQUALITY_DELETE_RECORD_COUNT.fieldId(), Long.class)); + stats.set( + EQUALITY_DELETE_FILE_COUNT.fieldId(), + record.get(EQUALITY_DELETE_FILE_COUNT.fieldId(), Integer.class)); + stats.set(TOTAL_RECORD_COUNT.fieldId(), record.get(TOTAL_RECORD_COUNT.fieldId(), Long.class)); + stats.set(LAST_UPDATED_AT.fieldId(), record.get(LAST_UPDATED_AT.fieldId(), Long.class)); + stats.set( + LAST_UPDATED_SNAPSHOT_ID.fieldId(), + record.get(LAST_UPDATED_SNAPSHOT_ID.fieldId(), Long.class)); + return stats; + } + + private static Collection<PartitionStats> computeStats(Table table, Snapshot snapshot) { + Preconditions.checkArgument(table != null, "table cannot be null"); + Preconditions.checkArgument(Partitioning.isPartitioned(table), "table must be partitioned"); + Preconditions.checkArgument(snapshot != null, "snapshot cannot be null"); + + StructType partitionType = Partitioning.partitionType(table); + List<ManifestFile> manifests = snapshot.allManifests(table.io()); + Queue<PartitionMap<PartitionStats>> statsByManifest = Queues.newConcurrentLinkedQueue(); + Tasks.foreach(manifests) + .stopOnFailure() + .throwFailureWhenFinished() + .executeWith(ThreadPools.getWorkerPool()) + .run(manifest -> statsByManifest.add(collectStats(table, manifest, partitionType))); + + return mergeStats(statsByManifest, table.specs()); + } + + private static List<PartitionStats> sortStats( + Collection<PartitionStats> stats, StructType partitionType) { + List<PartitionStats> entries = Lists.newArrayList(stats); + entries.sort(partitionStatsCmp(partitionType)); + return entries; + } + + private static Comparator<PartitionStats> partitionStatsCmp(StructType partitionType) { Review Comment: do we need a method for this? -- This is an automated message from the Apache Git Service. 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