aokolnychyi commented on code in PR #6365: URL: https://github.com/apache/iceberg/pull/6365#discussion_r1072927613
########## core/src/main/java/org/apache/iceberg/PositionDeletesTable.java: ########## @@ -0,0 +1,396 @@ +/* + * 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.MetadataColumns.POSITION_DELETE_TABLE_FILE_PATH_ID; +import static org.apache.iceberg.MetadataColumns.POSITION_DELETE_TABLE_PARTITION_FIELD_ID; +import static org.apache.iceberg.MetadataColumns.POSITION_DELETE_TABLE_SPEC_ID; + +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.LoadingCache; +import java.util.List; +import java.util.Map; +import java.util.function.BiFunction; +import java.util.stream.Collectors; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.expressions.ResidualEvaluator; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.base.MoreObjects; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.types.Type; +import org.apache.iceberg.types.TypeUtil; +import org.apache.iceberg.types.Types; +import org.apache.iceberg.util.ParallelIterable; +import org.apache.iceberg.util.PartitionUtil; +import org.apache.iceberg.util.TableScanUtil; + +public class PositionDeletesTable extends BaseMetadataTable { + + private final Schema schema; + + PositionDeletesTable(TableOperations ops, Table table) { + super(ops, table, table.name() + ".position_deletes"); + this.schema = calculateSchema(); + } + + PositionDeletesTable(TableOperations ops, Table table, String name) { + super(ops, table, name); + this.schema = calculateSchema(); + } + + @Override + MetadataTableType metadataTableType() { + return MetadataTableType.POSITION_DELETES; + } + + @Override + public TableScan newScan() { + throw new UnsupportedOperationException( + "Cannot create TableScan from table of type POSITION_DELETES"); + } + + @Override + public BatchScan newBatchScan() { + return new PositionDeletesBatchScan(operations(), table(), schema()); + } + + @Override + public Schema schema() { + return schema; + } + + private Schema calculateSchema() { + Types.StructType partitionType = Partitioning.partitionType(table()); + Schema result = + new Schema( + MetadataColumns.DELETE_FILE_PATH, + MetadataColumns.DELETE_FILE_POS, + Types.NestedField.optional( + MetadataColumns.DELETE_FILE_ROW_FIELD_ID, + "row", + table().schema().asStruct(), + MetadataColumns.DELETE_FILE_ROW_DOC), + Types.NestedField.required( + POSITION_DELETE_TABLE_PARTITION_FIELD_ID, + "partition", + partitionType, + "Partition that position delete row belongs to"), + Types.NestedField.required( + POSITION_DELETE_TABLE_SPEC_ID, + "spec_id", + Types.IntegerType.get(), + "Spec ID of the file that the position delete row belongs to"), + Types.NestedField.required( + POSITION_DELETE_TABLE_FILE_PATH_ID, + "delete_file_path", + Types.StringType.get(), + "Path of the delete file that the position delete row belongs to")); + + if (partitionType.fields().size() > 0) { + return result; + } else { + // avoid returning an empty struct, which is not always supported. + // instead, drop the partition field + return TypeUtil.selectNot(result, Sets.newHashSet(POSITION_DELETE_TABLE_PARTITION_FIELD_ID)); + } + } + + public static class PositionDeletesBatchScan + extends SnapshotScan<BatchScan, ScanTask, ScanTaskGroup<ScanTask>> implements BatchScan { + + protected PositionDeletesBatchScan(TableOperations ops, Table table, Schema schema) { + super(ops, table, schema, new TableScanContext()); + } + + protected PositionDeletesBatchScan( + TableOperations ops, Table table, Schema schema, TableScanContext context) { + super(ops, table, schema, context); + } + + @Override + protected PositionDeletesBatchScan newRefinedScan( + TableOperations newOps, Table newTable, Schema newSchema, TableScanContext newContext) { + return new PositionDeletesBatchScan(newOps, newTable, newSchema, newContext); + } + + @Override + public CloseableIterable<ScanTaskGroup<ScanTask>> planTasks() { + return TableScanUtil.planTaskGroups( + planFiles(), targetSplitSize(), splitLookback(), splitOpenFileCost()); + } + + protected List<String> scanColumns() { + return context().returnColumnStats() ? DELETE_SCAN_WITH_STATS_COLUMNS : DELETE_SCAN_COLUMNS; + } + + @Override + protected CloseableIterable<ScanTask> doPlanFiles() { + Expression rowFilter = filter(); + String schemaString = SchemaParser.toJson(tableSchema()); + + // prepare transformed partition specs and caches + Map<Integer, PartitionSpec> transformedSpecs = + table().specs().values().stream() + .map(spec -> transformSpec(tableSchema(), spec)) + .collect(Collectors.toMap(PartitionSpec::specId, spec -> spec)); + + LoadingCache<Integer, ResidualEvaluator> residualCache = + Caffeine.newBuilder() + .build( + specId -> { + PartitionSpec spec = transformedSpecs.get(specId); + Expression filter = + context().ignoreResiduals() ? Expressions.alwaysTrue() : filter(); + return ResidualEvaluator.of(spec, filter, isCaseSensitive()); + }); + LoadingCache<Integer, String> specStringCache = + Caffeine.newBuilder() + .build( + specId -> { + PartitionSpec spec = transformedSpecs.get(specId); + return PartitionSpecParser.toJson(spec); + }); + + // iterate through delete manifests + CloseableIterable<ManifestFile> deleteManifests = + CloseableIterable.withNoopClose(snapshot().deleteManifests(tableOps().io())); + CloseableIterable<CloseableIterable<ScanTask>> results = + CloseableIterable.transform( + deleteManifests, + manifest -> { + // Filter partitions + CloseableIterable<ManifestEntry<DeleteFile>> deleteFileEntries = + ManifestFiles.readDeleteManifest(manifest, tableOps().io(), transformedSpecs) + .caseSensitive(isCaseSensitive()) + .select(scanColumns()) + .filterRows(rowFilter) + .liveEntries(); + + // Filter delete file type + CloseableIterable<ManifestEntry<DeleteFile>> positionDeleteEntries = + CloseableIterable.filter( + deleteFileEntries, + entry -> entry.file().content().equals(FileContent.POSITION_DELETES)); + + Types.StructType partitionType = Partitioning.partitionType(table()); + + return CloseableIterable.transform( + positionDeleteEntries, + entry -> { + int specId = entry.file().specId(); + return new PositionDeleteScanTaskImpl( + entry.file().copyWithoutStats(), + schemaString, + specStringCache.get(specId), + residualCache.get(specId), + partitionType); + }); + }); + + return new ParallelIterable<>(results, planExecutor()); + } + } + + /** Scan task for position delete files */ + public interface PositionDeleteScanTask extends ContentScanTask<DeleteFile> { + + /** + * Utility method to get constant values of rows to be scanned by this task. The following + * columns are constants of each PositionDeletesFileScanTask: * spec_id * partition * + * delete_file_path + * + * @return a map of column id to constant values returned by this task type + */ + Map<Integer, ?> constantsMap(); + + /** + * Utility method to get constant values of rows to be scanned by this task. The following + * columns are constants of each PositionDeletesFileScanTask: * spec_id * partition * + * delete_file_path + * + * @param convertConstant callback to convert from an Iceberg typed object to an engine specific + * object + * @return a map of column id to constant values returned by this task type + */ + Map<Integer, ?> constantsMap(BiFunction<Type, Object, Object> convertConstant); + } + + static class PositionDeleteScanTaskImpl + extends BaseContentScanTask<PositionDeleteScanTask, DeleteFile> + implements PositionDeleteScanTask, SplittableScanTask<PositionDeleteScanTask> { + + private final Types.StructType partitionType; + + PositionDeleteScanTaskImpl( + DeleteFile file, + String schemaString, + String specString, + ResidualEvaluator evaluator, + Types.StructType partitionType) { + super(file, schemaString, specString, evaluator); + this.partitionType = partitionType; + } + + @Override + public long sizeBytes() { Review Comment: We may even make it default in `ContentScanTask`. -- This is an automated message from the Apache Git Service. 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