ajantha-bhat commented on code in PR #10176: URL: https://github.com/apache/iceberg/pull/10176#discussion_r1698339571
########## core/src/main/java/org/apache/iceberg/PartitionStatsUtil.java: ########## @@ -0,0 +1,227 @@ +/* + * 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.Map; +import org.apache.iceberg.data.GenericRecord; +import org.apache.iceberg.data.Record; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.types.Types; +import org.apache.iceberg.util.PartitionUtil; + +public class PartitionStatsUtil { + + private PartitionStatsUtil() {} + + public enum Column { + PARTITION, + SPEC_ID, + DATA_RECORD_COUNT, + DATA_FILE_COUNT, + TOTAL_DATA_FILE_SIZE_IN_BYTES, + POSITION_DELETE_RECORD_COUNT, + POSITION_DELETE_FILE_COUNT, + EQUALITY_DELETE_RECORD_COUNT, + EQUALITY_DELETE_FILE_COUNT, + TOTAL_RECORD_COUNT, + LAST_UPDATED_AT, + LAST_UPDATED_SNAPSHOT_ID + } + + /** + * Generates a Schema object as per partition statistics spec based on the given partition type. + * + * @param partitionType the struct type that defines the structure of the partition. + * @return a Schema object that corresponds to the provided partition type. + */ + public static Schema schema(Types.StructType partitionType) { + if (partitionType.fields().isEmpty()) { + throw new IllegalArgumentException("getting schema for an unpartitioned table"); + } + + return new Schema( + Types.NestedField.required(1, Column.PARTITION.name(), partitionType), + Types.NestedField.required(2, Column.SPEC_ID.name(), Types.IntegerType.get()), + Types.NestedField.required(3, Column.DATA_RECORD_COUNT.name(), Types.LongType.get()), + Types.NestedField.required(4, Column.DATA_FILE_COUNT.name(), Types.IntegerType.get()), + Types.NestedField.required( + 5, Column.TOTAL_DATA_FILE_SIZE_IN_BYTES.name(), Types.LongType.get()), + Types.NestedField.optional( + 6, Column.POSITION_DELETE_RECORD_COUNT.name(), Types.LongType.get()), + Types.NestedField.optional( + 7, Column.POSITION_DELETE_FILE_COUNT.name(), Types.IntegerType.get()), + Types.NestedField.optional( + 8, Column.EQUALITY_DELETE_RECORD_COUNT.name(), Types.LongType.get()), + Types.NestedField.optional( + 9, Column.EQUALITY_DELETE_FILE_COUNT.name(), Types.IntegerType.get()), + Types.NestedField.optional(10, Column.TOTAL_RECORD_COUNT.name(), Types.LongType.get()), + Types.NestedField.optional(11, Column.LAST_UPDATED_AT.name(), Types.LongType.get()), + Types.NestedField.optional( + 12, Column.LAST_UPDATED_SNAPSHOT_ID.name(), Types.LongType.get())); + } + + /** + * Creates an iterable of partition stats records from a given manifest file, using the specified + * table and record schema. + * + * @param table the table from which the manifest file is derived. + * @param manifest the manifest file containing metadata about the records. + * @param recordSchema the schema defining the structure of the records. + * @return a CloseableIterable of partition stats records as defined by the manifest file and + * record schema. + */ + public static CloseableIterable<Record> fromManifest( + Table table, ManifestFile manifest, Schema recordSchema) { + return CloseableIterable.transform( + ManifestFiles.open(manifest, table.io(), table.specs()) + .select(BaseScan.scanColumns(manifest.content())) + .liveEntries(), Review Comment: I wanted to avoid duplicate stats, for example when compacted or for rewrite manifests, old manifests will be marked as `DELETED`. Hence, keeping liveEntries will help skipping those manifests. Also, if the manifests are marked as `DELETED`, it won't be considered for table scan. So, since these stats are used for query planning, I think it is safe to skip these. Thoughts? -- 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: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
