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[core] Support to query indexes (apache#4788)
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238 changes: 238 additions & 0 deletions
238
paimon-core/src/main/java/org/apache/paimon/table/system/TableIndexesTable.java
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.paimon.table.system; | ||
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| import org.apache.paimon.Snapshot; | ||
| import org.apache.paimon.data.BinaryString; | ||
| import org.apache.paimon.data.GenericRow; | ||
| import org.apache.paimon.data.InternalRow; | ||
| import org.apache.paimon.disk.IOManager; | ||
| import org.apache.paimon.index.DeletionVectorMeta; | ||
| import org.apache.paimon.index.IndexFileHandler; | ||
| import org.apache.paimon.index.IndexFileMetaSerializer; | ||
| import org.apache.paimon.manifest.IndexManifestEntry; | ||
| import org.apache.paimon.predicate.Predicate; | ||
| import org.apache.paimon.reader.RecordReader; | ||
| import org.apache.paimon.table.FileStoreTable; | ||
| import org.apache.paimon.table.ReadonlyTable; | ||
| import org.apache.paimon.table.Table; | ||
| import org.apache.paimon.table.source.InnerTableRead; | ||
| import org.apache.paimon.table.source.InnerTableScan; | ||
| import org.apache.paimon.table.source.ReadOnceTableScan; | ||
| import org.apache.paimon.table.source.SingletonSplit; | ||
| import org.apache.paimon.table.source.Split; | ||
| import org.apache.paimon.table.source.TableRead; | ||
| import org.apache.paimon.table.source.snapshot.TimeTravelUtil; | ||
| import org.apache.paimon.types.ArrayType; | ||
| import org.apache.paimon.types.BigIntType; | ||
| import org.apache.paimon.types.DataField; | ||
| import org.apache.paimon.types.IntType; | ||
| import org.apache.paimon.types.RowType; | ||
| import org.apache.paimon.utils.IteratorRecordReader; | ||
| import org.apache.paimon.utils.ProjectedRow; | ||
| import org.apache.paimon.utils.RowDataToObjectArrayConverter; | ||
| import org.apache.paimon.utils.SerializationUtils; | ||
|
|
||
| import org.apache.paimon.shade.guava30.com.google.common.collect.Iterators; | ||
|
|
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.Iterator; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
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| import static org.apache.paimon.catalog.Catalog.SYSTEM_TABLE_SPLITTER; | ||
| import static org.apache.paimon.utils.SerializationUtils.newStringType; | ||
|
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| /** A {@link Table} for showing indexes. */ | ||
| public class TableIndexesTable implements ReadonlyTable { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(TableIndexesTable.class); | ||
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| public static final String TABLE_INDEXES = "table_indexes"; | ||
|
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| public static final RowType TABLE_TYPE = | ||
| new RowType( | ||
| Arrays.asList( | ||
| new DataField(0, "partition", SerializationUtils.newStringType(true)), | ||
| new DataField(1, "bucket", new IntType(false)), | ||
| new DataField(2, "index_type", newStringType(false)), | ||
| new DataField(3, "file_name", newStringType(false)), | ||
| new DataField(4, "file_size", new BigIntType(false)), | ||
| new DataField(5, "row_count", new BigIntType(false)), | ||
| new DataField( | ||
| 6, | ||
| "dv_ranges", | ||
| new ArrayType(true, DeletionVectorMeta.SCHEMA)))); | ||
|
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| private final FileStoreTable dataTable; | ||
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| public TableIndexesTable(FileStoreTable dataTable) { | ||
| this.dataTable = dataTable; | ||
| } | ||
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| @Override | ||
| public InnerTableScan newScan() { | ||
| return new IndexesScan(); | ||
| } | ||
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| @Override | ||
| public InnerTableRead newRead() { | ||
| return new IndexesRead(dataTable); | ||
| } | ||
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| @Override | ||
| public String name() { | ||
| return dataTable.name() + SYSTEM_TABLE_SPLITTER + TABLE_INDEXES; | ||
| } | ||
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| @Override | ||
| public RowType rowType() { | ||
| return TABLE_TYPE; | ||
| } | ||
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| @Override | ||
| public List<String> primaryKeys() { | ||
| return Collections.singletonList("file_name"); | ||
| } | ||
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| @Override | ||
| public Table copy(Map<String, String> dynamicOptions) { | ||
| return new TableIndexesTable(dataTable.copy(dynamicOptions)); | ||
| } | ||
|
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| private static class IndexesScan extends ReadOnceTableScan { | ||
|
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| @Override | ||
| public InnerTableScan withFilter(Predicate predicate) { | ||
| return this; | ||
| } | ||
|
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| @Override | ||
| protected Plan innerPlan() { | ||
| return () -> Collections.singletonList(new IndexesSplit()); | ||
| } | ||
| } | ||
|
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| private static class IndexesSplit extends SingletonSplit { | ||
|
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| private static final long serialVersionUID = 1L; | ||
|
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| private IndexesSplit() {} | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| return o != null && getClass() == o.getClass(); | ||
| } | ||
| } | ||
|
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| private static class IndexesRead implements InnerTableRead { | ||
|
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| private RowType readType; | ||
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| private final FileStoreTable dataTable; | ||
|
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| public IndexesRead(FileStoreTable dataTable) { | ||
| this.dataTable = dataTable; | ||
| } | ||
|
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| @Override | ||
| public InnerTableRead withFilter(Predicate predicate) { | ||
| return this; | ||
| } | ||
|
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| @Override | ||
| public InnerTableRead withReadType(RowType readType) { | ||
| this.readType = readType; | ||
| return this; | ||
| } | ||
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| @Override | ||
| public TableRead withIOManager(IOManager ioManager) { | ||
| return this; | ||
| } | ||
|
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| @Override | ||
| public RecordReader<InternalRow> createReader(Split split) { | ||
| if (!(split instanceof IndexesSplit)) { | ||
| throw new IllegalArgumentException("Unsupported split: " + split.getClass()); | ||
| } | ||
| List<IndexManifestEntry> manifestFileMetas = allIndexEntries(dataTable); | ||
|
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| RowDataToObjectArrayConverter partitionConverter = | ||
| new RowDataToObjectArrayConverter(dataTable.schema().logicalPartitionType()); | ||
|
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| Iterator<InternalRow> rows = | ||
| Iterators.transform( | ||
| manifestFileMetas.iterator(), | ||
| indexManifestEntry -> toRow(indexManifestEntry, partitionConverter)); | ||
| if (readType != null) { | ||
| rows = | ||
| Iterators.transform( | ||
| rows, | ||
| row -> | ||
| ProjectedRow.from(readType, TableIndexesTable.TABLE_TYPE) | ||
| .replaceRow(row)); | ||
| } | ||
| return new IteratorRecordReader<>(rows); | ||
| } | ||
|
|
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| private InternalRow toRow( | ||
| IndexManifestEntry indexManifestEntry, | ||
| RowDataToObjectArrayConverter partitionConverter) { | ||
| LinkedHashMap<String, DeletionVectorMeta> dvMetas = | ||
| indexManifestEntry.indexFile().deletionVectorMetas(); | ||
| return GenericRow.of( | ||
| BinaryString.fromString( | ||
| Arrays.toString( | ||
| partitionConverter.convert(indexManifestEntry.partition()))), | ||
| indexManifestEntry.bucket(), | ||
| BinaryString.fromString(indexManifestEntry.indexFile().indexType()), | ||
| BinaryString.fromString(indexManifestEntry.indexFile().fileName()), | ||
| indexManifestEntry.indexFile().fileSize(), | ||
| indexManifestEntry.indexFile().rowCount(), | ||
| dvMetas == null | ||
| ? null | ||
| : IndexFileMetaSerializer.dvMetasToRowArrayData(dvMetas.values())); | ||
| } | ||
| } | ||
|
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| private static List<IndexManifestEntry> allIndexEntries(FileStoreTable dataTable) { | ||
| IndexFileHandler indexFileHandler = dataTable.store().newIndexFileHandler(); | ||
| Snapshot snapshot = TimeTravelUtil.resolveSnapshot(dataTable); | ||
| if (snapshot == null) { | ||
| LOG.warn("Check if your snapshot is empty."); | ||
| return Collections.emptyList(); | ||
| } | ||
| String indexManifest = snapshot.indexManifest(); | ||
| if (indexManifest == null || !indexFileHandler.existsManifest(indexManifest)) { | ||
| LOG.warn("indexManifest doesn't exist."); | ||
| return Collections.emptyList(); | ||
| } | ||
|
|
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| return indexFileHandler.readManifest(indexManifest); | ||
| } | ||
| } |
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