stevenzwu commented on code in PR #16936: URL: https://github.com/apache/iceberg/pull/16936#discussion_r4189540786
########## core/src/main/java/org/apache/iceberg/MapBackedContentStats.java: ########## @@ -0,0 +1,230 @@ +/* + * 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.nio.ByteOrder; +import java.util.Map; +import java.util.Objects; +import java.util.Set; +import org.apache.iceberg.geospatial.GeospatialBound; +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.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 Types.StructType type; + private final Map<Integer, FieldStats<?>> statsById = Maps.newHashMap(); + + 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, MetricsConfig metricsConfig) { + Preconditions.checkArgument(tableSchema != null, "Invalid table schema: null"); + Preconditions.checkArgument(metricsConfig != null, "Invalid metrics config: null"); + this.tableSchema = tableSchema; + this.type = StatsUtil.statsWriteSchema(tableSchema, metricsConfig); + } + + 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(); + return this; + } + + @Override + public Iterable<FieldStats<?>> fieldStats() { + return Iterables.filter( + Iterables.transform(type.fields(), field -> statsFor(StatsUtil.toFieldId(field.fieldId()))), + Objects::nonNull); + } + + @Override + @SuppressWarnings("unchecked") + public <T> FieldStats<T> statsFor(int fieldId) { + if (!hasStats(fieldId)) { + 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() { + 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 hasStats(int id) { + if (type.field(StatsUtil.toBaseId(id)) == null) { + return false; + } + + return containsId(valueCounts, id) + || containsId(nullValueCounts, id) + || containsId(nanValueCounts, id) + || containsId(avgValueSizes, id) + || containsId(lowerBounds, id) + || containsId(upperBounds, id); + } + + 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 field = type.field(StatsUtil.toBaseId(fieldId)); + Preconditions.checkArgument( + field != null, + "Cannot convert stats for field ID %s: unknown, not a scalar, or not in metrics config", + fieldId); + Types.NestedField column = tableSchema.findField(fieldId); + Preconditions.checkArgument(column != null, "Missing column for field ID %s", fieldId); + this.fieldId = fieldId; + this.struct = field.type().asStructType(); + this.columnType = column.type(); + this.boundType = struct.fieldType(StatsUtil.LOWER_BOUND_NAME); + } + + @Override + public int fieldId() { + return fieldId; + } + + @Override + public Types.StructType type() { + return struct; + } + + @Override + public T lowerBound() { + return decodeBound(lowerBounds); + } + + @Override + public T upperBound() { + return decodeBound(upperBounds); + } + + @SuppressWarnings("unchecked") + private T decodeBound(Map<Integer, ByteBuffer> bounds) { + if (boundType == null || bounds == null) { + return null; + } + + ByteBuffer buffer = bounds.get(fieldId); + if (columnType.typeId() == Type.TypeID.GEOMETRY + || columnType.typeId() == Type.TypeID.GEOGRAPHY) { + // File-map geometry and geography bounds are single-point encoded. + if (buffer == null) { + return null; + } + + ByteBuffer tmp = buffer.duplicate().order(ByteOrder.LITTLE_ENDIAN); + return (T) GeospatialBound.fromByteBuffer(tmp); Review Comment: oops. my mistake. reverted the change in the new commit. -- This is an automated message from the Apache Git Service. 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