| /* |
| * 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 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.io.FileIO; |
| import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; |
| import org.apache.iceberg.relocated.com.google.common.collect.Sets; |
| import org.apache.iceberg.types.TypeUtil; |
| |
| /** |
| * A {@link Table} implementation that exposes a table's data files as rows. |
| */ |
| public class DataFilesTable extends BaseMetadataTable { |
| private final TableOperations ops; |
| private final Table table; |
| private final String name; |
| |
| DataFilesTable(TableOperations ops, Table table) { |
| this(ops, table, table.name() + ".files"); |
| } |
| |
| DataFilesTable(TableOperations ops, Table table, String name) { |
| this.ops = ops; |
| this.table = table; |
| this.name = name; |
| } |
| |
| @Override |
| Table table() { |
| return table; |
| } |
| |
| @Override |
| public String name() { |
| return name; |
| } |
| |
| @Override |
| public TableScan newScan() { |
| return new FilesTableScan(ops, table, schema()); |
| } |
| |
| @Override |
| public Schema schema() { |
| Schema schema = new Schema(DataFile.getType(table.spec().partitionType()).fields()); |
| if (table.spec().fields().size() < 1) { |
| // avoid returning an empty struct, which is not always supported. instead, drop the partition field |
| return TypeUtil.selectNot(schema, Sets.newHashSet(DataFile.PARTITION_ID)); |
| } else { |
| return schema; |
| } |
| } |
| |
| @Override |
| String metadataLocation() { |
| return ops.current().metadataFileLocation(); |
| } |
| |
| @Override |
| MetadataTableType metadataTableType() { |
| return MetadataTableType.FILES; |
| } |
| |
| public static class FilesTableScan extends BaseTableScan { |
| private final Schema fileSchema; |
| |
| FilesTableScan(TableOperations ops, Table table, Schema fileSchema) { |
| super(ops, table, fileSchema); |
| this.fileSchema = fileSchema; |
| } |
| |
| private FilesTableScan(TableOperations ops, Table table, Schema schema, Schema fileSchema, |
| TableScanContext context) { |
| super(ops, table, schema, context); |
| this.fileSchema = fileSchema; |
| } |
| |
| @Override |
| protected TableScan newRefinedScan(TableOperations ops, Table table, Schema schema, TableScanContext context) { |
| return new FilesTableScan(ops, table, schema, fileSchema, context); |
| } |
| |
| @Override |
| protected long targetSplitSize(TableOperations ops) { |
| return ops.current().propertyAsLong( |
| TableProperties.METADATA_SPLIT_SIZE, TableProperties.METADATA_SPLIT_SIZE_DEFAULT); |
| } |
| |
| @Override |
| protected CloseableIterable<FileScanTask> planFiles( |
| TableOperations ops, Snapshot snapshot, Expression rowFilter, |
| boolean ignoreResiduals, boolean caseSensitive, boolean colStats) { |
| CloseableIterable<ManifestFile> manifests = CloseableIterable.withNoopClose(snapshot.dataManifests()); |
| String schemaString = SchemaParser.toJson(schema()); |
| String specString = PartitionSpecParser.toJson(PartitionSpec.unpartitioned()); |
| Expression filter = ignoreResiduals ? Expressions.alwaysTrue() : rowFilter; |
| ResidualEvaluator residuals = ResidualEvaluator.unpartitioned(filter); |
| |
| // Data tasks produce the table schema, not the projection schema and projection is done by processing engines. |
| // This data task needs to use the table schema, which may not include a partition schema to avoid having an |
| // empty struct in the schema for unpartitioned tables. Some engines, like Spark, can't handle empty structs in |
| // all cases. |
| return CloseableIterable.transform(manifests, manifest -> |
| new ManifestReadTask(ops.io(), manifest, fileSchema, schemaString, specString, residuals)); |
| } |
| } |
| |
| static class ManifestReadTask extends BaseFileScanTask implements DataTask { |
| private final FileIO io; |
| private final ManifestFile manifest; |
| private final Schema schema; |
| |
| ManifestReadTask(FileIO io, ManifestFile manifest, Schema schema, String schemaString, |
| String specString, ResidualEvaluator residuals) { |
| super(DataFiles.fromManifest(manifest), null, schemaString, specString, residuals); |
| this.io = io; |
| this.manifest = manifest; |
| this.schema = schema; |
| } |
| |
| @Override |
| public CloseableIterable<StructLike> rows() { |
| return CloseableIterable.transform( |
| ManifestFiles.read(manifest, io).project(schema), |
| file -> (GenericDataFile) file); |
| } |
| |
| @Override |
| public Iterable<FileScanTask> split(long splitSize) { |
| return ImmutableList.of(this); // don't split |
| } |
| } |
| } |