vaibhavk1992 commented on code in PR #729: URL: https://github.com/apache/incubator-xtable/pull/729#discussion_r2559445340
########## xtable-core/src/main/java/org/apache/xtable/kernel/DeltaKernelConversionSource.java: ########## @@ -0,0 +1,239 @@ +/* + * 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.xtable.kernel; + +import java.io.IOException; +import java.sql.Timestamp; +import java.time.Instant; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Optional; + +import lombok.Builder; +import lombok.extern.slf4j.Slf4j; + +import io.delta.kernel.Snapshot; +import io.delta.kernel.Table; +import io.delta.kernel.engine.Engine; +import io.delta.kernel.internal.SnapshotImpl; +import io.delta.kernel.internal.actions.AddFile; +import io.delta.kernel.internal.actions.RemoveFile; +import io.delta.kernel.internal.actions.RowBackedAction; +import io.delta.kernel.internal.util.VectorUtils; + +import org.apache.xtable.exception.ReadException; +import org.apache.xtable.model.CommitsBacklog; +import org.apache.xtable.model.InstantsForIncrementalSync; +import org.apache.xtable.model.InternalSnapshot; +import org.apache.xtable.model.InternalTable; +import org.apache.xtable.model.TableChange; +import org.apache.xtable.model.schema.InternalSchema; +import org.apache.xtable.model.storage.FileFormat; +import org.apache.xtable.model.storage.InternalDataFile; +import org.apache.xtable.model.storage.InternalFilesDiff; +import org.apache.xtable.model.storage.PartitionFileGroup; +import org.apache.xtable.spi.extractor.ConversionSource; +import org.apache.xtable.spi.extractor.DataFileIterator; + +@Slf4j +@Builder +public class DeltaKernelConversionSource implements ConversionSource<Long> { + + @Builder.Default + private final DeltaKernelDataFileExtractor dataFileExtractor = + DeltaKernelDataFileExtractor.builder().build(); + + @Builder.Default + private final DeltaKernelActionsConverter actionsConverter = + DeltaKernelActionsConverter.getInstance(); + + private final String basePath; + private final String tableName; + private final Engine engine; + + @Builder.Default + private final DeltaKernelTableExtractor tableExtractor = + DeltaKernelTableExtractor.builder().build(); + + private Optional<DeltaKernelIncrementalChangesState> deltaKernelIncrementalChangesState = + Optional.empty(); + + @Override + public InternalTable getTable(Long version) { + try { + Table table = Table.forPath(engine, basePath); + Snapshot snapshot = table.getSnapshotAsOfVersion(engine, version); + return tableExtractor.table(table, snapshot, engine, tableName, basePath); + } catch (Exception e) { + throw new ReadException("Failed to get table at version " + version, e); + } + } + + @Override + public InternalTable getCurrentTable() { + Table table = Table.forPath(engine, basePath); + Snapshot snapshot = table.getLatestSnapshot(engine); + return getTable(snapshot.getVersion()); + } + + @Override + public InternalSnapshot getCurrentSnapshot() { + Table table_snapshot = Table.forPath(engine, basePath); + Snapshot snapshot = table_snapshot.getLatestSnapshot(engine); + InternalTable table = getTable(snapshot.getVersion()); + return InternalSnapshot.builder() + .table(table) + .partitionedDataFiles( + getInternalDataFiles(snapshot, table_snapshot, engine, table.getReadSchema())) + .sourceIdentifier(getCommitIdentifier(snapshot.getVersion())) + .build(); + } + + @Override + public TableChange getTableChangeForCommit(Long versionNumber) { + Table table = Table.forPath(engine, basePath); + Snapshot snapshot = table.getSnapshotAsOfVersion(engine, versionNumber); + InternalTable tableAtVersion = + tableExtractor.table(table, snapshot, engine, tableName, basePath); + Map<String, InternalDataFile> addedFiles = new HashMap<>(); + Map<String, InternalDataFile> removedFiles = new HashMap<>(); + String provider = ((SnapshotImpl) snapshot).getMetadata().getFormat().getProvider(); + FileFormat fileFormat = actionsConverter.convertToFileFormat(provider); + + List<RowBackedAction> actionsForVersion = getChangesState().getActionsForVersion(versionNumber); + + for (RowBackedAction action : actionsForVersion) { + if (action instanceof AddFile) { + AddFile addFile = (AddFile) action; + Map<String, String> partitionValues = VectorUtils.toJavaMap(addFile.getPartitionValues()); + InternalDataFile dataFile = + actionsConverter.convertAddActionToInternalDataFile( + addFile, + table, + fileFormat, + tableAtVersion.getPartitioningFields(), + tableAtVersion.getReadSchema().getFields(), + true, + DeltaKernelPartitionExtractor.getInstance(), + DeltaKernelStatsExtractor.getInstance(), + partitionValues); + addedFiles.put(dataFile.getPhysicalPath(), dataFile); + } else if (action instanceof RemoveFile) { + RemoveFile removeFile = (RemoveFile) action; + Map<String, String> partitionValues = + removeFile + .getPartitionValues() + .map(VectorUtils::<String, String>toJavaMap) + .orElse(Collections.emptyMap()); + InternalDataFile dataFile = + actionsConverter.convertRemoveActionToInternalDataFile( + removeFile, + table, + fileFormat, + tableAtVersion.getPartitioningFields(), + DeltaKernelPartitionExtractor.getInstance(), + partitionValues); + removedFiles.put(dataFile.getPhysicalPath(), dataFile); + } + } + + InternalFilesDiff internalFilesDiff = + InternalFilesDiff.builder() + .filesAdded(addedFiles.values()) + .filesRemoved(removedFiles.values()) + .build(); + return TableChange.builder() + .tableAsOfChange(tableAtVersion) + .filesDiff(internalFilesDiff) + .sourceIdentifier(getCommitIdentifier(versionNumber)) + .build(); + } + + @Override + public CommitsBacklog<Long> getCommitsBacklog( + InstantsForIncrementalSync instantsForIncrementalSync) { + Table table = Table.forPath(engine, basePath); + Snapshot snapshot = + table.getSnapshotAsOfTimestamp( + engine, Timestamp.from(instantsForIncrementalSync.getLastSyncInstant()).getTime()); + + long versionNumberAtLastSyncInstant = snapshot.getVersion(); + resetState(versionNumberAtLastSyncInstant + 1, engine, table); + return CommitsBacklog.<Long>builder() + .commitsToProcess(getChangesState().getVersionsInSortedOrder()) + .build(); + } + + @Override + public boolean isIncrementalSyncSafeFrom(Instant instant) { + try { + Table table = Table.forPath(engine, basePath); + Snapshot snapshot = table.getSnapshotAsOfTimestamp(engine, Timestamp.from(instant).getTime()); + + // There is a chance earliest commit of the table is returned if the instant is before the + // earliest commit of the table, hence the additional check. + Instant deltaCommitInstant = Instant.ofEpochMilli(snapshot.getTimestamp(engine)); + return deltaCommitInstant.equals(instant) || deltaCommitInstant.isBefore(instant); + } catch (Exception e) { + log.error( + "Error checking if incremental sync is safe from " + instant + ": " + e.getMessage()); Review Comment: done. -- This is an automated message from the Apache Git Service. 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