pvary commented on code in PR #14640: URL: https://github.com/apache/iceberg/pull/14640#discussion_r2620280198
########## core/src/main/java/org/apache/iceberg/BasePartitionStatisticsScan.java: ########## @@ -0,0 +1,86 @@ +/* + * 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 java.util.Optional; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.types.Types; + +public class BasePartitionStatisticsScan implements PartitionStatisticsScan { + + private final Table table; + private Long snapshotId; + + public BasePartitionStatisticsScan(Table table) { + this.table = table; + } + + @Override + public PartitionStatisticsScan useSnapshot(long newSnapshotId) { + Preconditions.checkArgument( + table.snapshot(newSnapshotId) != null, "Cannot find snapshot with ID %s", newSnapshotId); + + this.snapshotId = newSnapshotId; + return this; + } + + @Override + public PartitionStatisticsScan filter(Expression newFilter) { + throw new UnsupportedOperationException("Filtering is not supported"); + } + + @Override + public PartitionStatisticsScan project(Schema newSchema) { + throw new UnsupportedOperationException("Projection is not supported"); + } + + @Override + public CloseableIterable<PartitionStatistics> scan() { + if (snapshotId == null) { + if (table.currentSnapshot() == null) { + return CloseableIterable.empty(); + } + + snapshotId = table.currentSnapshot().snapshotId(); + } + + Optional<PartitionStatisticsFile> statsFile = + table.partitionStatisticsFiles().stream() + .filter(f -> f.snapshotId() == snapshotId) + .findFirst(); + + if (statsFile.isEmpty()) { Review Comment: I’ll go with the second option for now. If we later identify a common or generic need to fetch statistics that are "around" a specific snapshot, we can introduce a new API method or add a utility function in the Iceberg core -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
