rdblue commented on code in PR #16936: URL: https://github.com/apache/iceberg/pull/16936#discussion_r4198174304
########## core/src/main/java/org/apache/iceberg/MapBackedContentStats.java: ########## @@ -0,0 +1,231 @@ +/* + * 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.nio.ByteBuffer; +import java.util.Map; +import java.util.Objects; +import java.util.Set; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Iterables; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.types.Conversions; +import org.apache.iceberg.types.Type; +import org.apache.iceberg.types.Types; + +/** Reusable {@link ContentStats} view over a {@link ContentFile}'s stat maps. */ +class MapBackedContentStats implements ContentStats { + private final Schema tableSchema; + private final Map<Integer, FieldStats<?>> statsById = Maps.newHashMap(); + + private Types.StructType type; + private Map<Integer, Long> valueCounts; + private Map<Integer, Long> nullValueCounts; + private Map<Integer, Long> nanValueCounts; + private Map<Integer, Integer> avgValueSizes; + private Map<Integer, ByteBuffer> lowerBounds; + private Map<Integer, ByteBuffer> upperBounds; + + MapBackedContentStats(Schema tableSchema) { + Preconditions.checkArgument(tableSchema != null, "Invalid table schema: null"); + this.tableSchema = tableSchema; + } + + MapBackedContentStats wrap(ContentFile<?> file) { + this.valueCounts = file.valueCounts(); + this.nullValueCounts = file.nullValueCounts(); + this.nanValueCounts = file.nanValueCounts(); + this.avgValueSizes = file.avgValueSizes(); + this.lowerBounds = file.lowerBounds(); + this.upperBounds = file.upperBounds(); + this.type = null; + statsById.clear(); + return this; + } + + @Override + public Iterable<FieldStats<?>> fieldStats() { + return Iterables.filter(Iterables.transform(statsFieldIds(), this::statsFor), Objects::nonNull); + } + + @Override + @SuppressWarnings("unchecked") + public <T> FieldStats<T> statsFor(int fieldId) { + if (!containsFieldInMaps(fieldId) || tableSchema.findField(fieldId) == null) { + return null; + } + + FieldStats<?> fieldStats = statsById.get(fieldId); + if (fieldStats == null) { + fieldStats = new MapBackedFieldStats<>(fieldId); + statsById.put(fieldId, fieldStats); + } + + return (FieldStats<T>) fieldStats; + } + + @Override + public Types.StructType type() { + if (type == null) { + this.type = StatsUtil.statsReadSchema(tableSchema, statsFieldIds()); + } + + return type; + } + + @Override + public ContentStats copy() { + throw new UnsupportedOperationException("copy is not implemented"); + } + + @Override + public ContentStats copy(Set<Integer> fieldIds) { + throw new UnsupportedOperationException("copy is not implemented"); + } + + boolean containsFieldInMaps(int fieldId) { + return containsId(valueCounts, fieldId) + || containsId(nullValueCounts, fieldId) + || containsId(nanValueCounts, fieldId) + || containsId(avgValueSizes, fieldId) + || containsId(lowerBounds, fieldId) + || containsId(upperBounds, fieldId); + } + + private Set<Integer> statsFieldIds() { + Set<Integer> ids = + Sets.newHashSetWithExpectedSize(valueCounts == null ? 0 : valueCounts.size()); + addKeys(ids, valueCounts); + addKeys(ids, nullValueCounts); + addKeys(ids, nanValueCounts); + addKeys(ids, avgValueSizes); + addKeys(ids, lowerBounds); + addKeys(ids, upperBounds); + return ids; + } + + private static void addKeys(Set<Integer> ids, Map<Integer, ?> map) { + if (map != null) { + ids.addAll(map.keySet()); + } + } + + private static boolean containsId(Map<Integer, ?> map, int id) { + return map != null && map.containsKey(id); + } + + /** Reusable {@link FieldStats} view over one field's entries in a {@link ContentFile}'s maps. */ + private class MapBackedFieldStats<T> implements FieldStats<T> { + private final int fieldId; + private final Types.StructType struct; + private final Type columnType; + private final Type boundType; + + MapBackedFieldStats(int fieldId) { + Types.NestedField column = tableSchema.findField(fieldId); + Preconditions.checkArgument(column != null, "Missing column for field ID %s", fieldId); + this.fieldId = fieldId; + this.columnType = column.type(); + int baseId = StatsUtil.toBaseId(fieldId); + this.struct = StatsUtil.fieldStatsStruct(columnType, baseId, MetricsModes.Full.get()); + Types.NestedField lowerBound = + struct == null ? null : struct.field(baseId + StatsUtil.LOWER_BOUND_OFFSET); Review Comment: I think this should use `struct.fieldType(StatsUtil.LOWER_BOUND_NAME)` like `FieldStatsStruct`. -- This is an automated message from the Apache Git Service. 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