RussellSpitzer commented on code in PR #10176: URL: https://github.com/apache/iceberg/pull/10176#discussion_r1721954085
########## core/src/main/java/org/apache/iceberg/PartitionStatsUtil.java: ########## @@ -0,0 +1,218 @@ +/* + * 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 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 that corresponds to the provided partition type. + */ + public static Schema schema(Types.StructType partitionType) { + Preconditions.checkState( + !partitionType.fields().isEmpty(), "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(), + entry -> fromManifestEntry(entry, table, recordSchema)); + } + + /** + * Appends statistics from one Record to another. + * + * @param toRecord the Record to which statistics will be appended. + * @param fromRecord the Record from which statistics will be sourced. + */ + public static void appendStats(Record toRecord, Record fromRecord) { + Preconditions.checkState(toRecord != null, "Record to update cannot be null"); + Preconditions.checkState(fromRecord != null, "Record to update from cannot be null"); + + toRecord.set( + Column.SPEC_ID.ordinal(), + Math.max( + (int) toRecord.get(Column.SPEC_ID.ordinal()), + (int) fromRecord.get(Column.SPEC_ID.ordinal()))); + checkAndIncrementLong(toRecord, fromRecord, Column.DATA_RECORD_COUNT); + checkAndIncrementInt(toRecord, fromRecord, Column.DATA_FILE_COUNT); + checkAndIncrementLong(toRecord, fromRecord, Column.TOTAL_DATA_FILE_SIZE_IN_BYTES); + checkAndIncrementLong(toRecord, fromRecord, Column.POSITION_DELETE_RECORD_COUNT); + checkAndIncrementInt(toRecord, fromRecord, Column.POSITION_DELETE_FILE_COUNT); + checkAndIncrementLong(toRecord, fromRecord, Column.EQUALITY_DELETE_RECORD_COUNT); + checkAndIncrementInt(toRecord, fromRecord, Column.EQUALITY_DELETE_FILE_COUNT); + checkAndIncrementLong(toRecord, fromRecord, Column.TOTAL_RECORD_COUNT); + if (fromRecord.get(Column.LAST_UPDATED_AT.ordinal()) != null) { + if (toRecord.get(Column.LAST_UPDATED_AT.ordinal()) == null + || ((long) toRecord.get(Column.LAST_UPDATED_AT.ordinal()) + < (long) fromRecord.get(Column.LAST_UPDATED_AT.ordinal()))) { + toRecord.set( + Column.LAST_UPDATED_AT.ordinal(), fromRecord.get(Column.LAST_UPDATED_AT.ordinal())); + toRecord.set( + Column.LAST_UPDATED_SNAPSHOT_ID.ordinal(), + fromRecord.get(Column.LAST_UPDATED_SNAPSHOT_ID.ordinal())); + } + } + } + + private static Record fromManifestEntry( + ManifestEntry<?> entry, Table table, Schema recordSchema) { + GenericRecord record = GenericRecord.create(recordSchema); + Types.StructType partitionType = + recordSchema.findField(Column.PARTITION.name()).type().asStructType(); + Record partitionData = coercedPartitionData(entry.file(), table.specs(), partitionType); Review Comment: Does this work with an unpartitioned spec? or are we guarding against it elsewhere? -- This is an automated message from the Apache Git Service. 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