manuzhang commented on code in PR #13786: URL: https://github.com/apache/iceberg/pull/13786#discussion_r2593140947
########## spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/parquet/CometVectorizedParquetReader.java: ########## @@ -0,0 +1,352 @@ +/* + * 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.spark.parquet; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.nio.ByteBuffer; +import java.util.List; +import java.util.Map; +import java.util.NoSuchElementException; +import java.util.function.Function; +import org.apache.comet.parquet.FileReader; +import org.apache.comet.parquet.ParquetColumnSpec; +import org.apache.comet.parquet.ReadOptions; +import org.apache.comet.parquet.RowGroupReader; +import org.apache.comet.parquet.WrappedInputFile; +import org.apache.hadoop.conf.Configuration; +import org.apache.iceberg.Schema; +import org.apache.iceberg.exceptions.RuntimeIOException; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.io.CloseableGroup; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.CloseableIterator; +import org.apache.iceberg.io.InputFile; +import org.apache.iceberg.mapping.NameMapping; +import org.apache.iceberg.parquet.ReadConf; +import org.apache.iceberg.parquet.VectorizedReader; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.util.ByteBuffers; +import org.apache.parquet.ParquetReadOptions; +import org.apache.parquet.column.ColumnDescriptor; +import org.apache.parquet.hadoop.metadata.ColumnChunkMetaData; +import org.apache.parquet.hadoop.metadata.ColumnPath; +import org.apache.parquet.schema.MessageType; + +public class CometVectorizedParquetReader<T> extends CloseableGroup + implements CloseableIterable<T> { + private final InputFile input; + private final ParquetReadOptions options; + private final Schema expectedSchema; + private final Function<MessageType, VectorizedReader<?>> batchReaderFunc; + private final Expression filter; + private final boolean reuseContainers; + private final boolean caseSensitive; + private final int batchSize; + private final NameMapping nameMapping; + private final Map<String, String> properties; + private final Long start; + private final Long length; + private final ByteBuffer fileEncryptionKey; + private final ByteBuffer fileAADPrefix; + + private CometVectorizedParquetReader( + InputFile input, + Schema expectedSchema, + ParquetReadOptions options, + Function<MessageType, VectorizedReader<?>> readerFunc, + NameMapping nameMapping, + Expression filter, + boolean reuseContainers, + boolean caseSensitive, + int maxRecordsPerBatch, + Map<String, String> properties, + Long start, + Long length, + ByteBuffer fileEncryptionKey, + ByteBuffer fileAADPrefix) { + this.input = input; + this.expectedSchema = expectedSchema; + this.options = options; + this.batchReaderFunc = readerFunc; + // replace alwaysTrue with null to avoid extra work evaluating a trivial filter + this.filter = filter == Expressions.alwaysTrue() ? null : filter; + this.reuseContainers = reuseContainers; + this.caseSensitive = caseSensitive; + this.batchSize = maxRecordsPerBatch; + this.nameMapping = nameMapping; + this.properties = properties; + this.start = start; + this.length = length; + this.fileEncryptionKey = fileEncryptionKey; + this.fileAADPrefix = fileAADPrefix; + } + + public static Builder builder( + InputFile file, + Schema schema, + ParquetReadOptions options, + Function<MessageType, VectorizedReader<?>> batchedReaderFunc) { + return new Builder(file, schema, options, batchedReaderFunc); + } + + public static class Builder { + private final InputFile file; + private final Schema schema; + private final ParquetReadOptions options; + private final Function<MessageType, VectorizedReader<?>> batchedReaderFunc; + private NameMapping nameMapping = null; + private Expression filter = null; + private boolean reuseContainers = false; + private boolean caseSensitive = true; + private int maxRecordsPerBatch = 10000; + private Map<String, String> properties = null; + private Long start = null; + private Long length = null; + private ByteBuffer fileEncryptionKey = null; + private ByteBuffer fileAADPrefix = null; + + private Builder( + InputFile file, + Schema schema, + ParquetReadOptions options, + Function<MessageType, VectorizedReader<?>> batchedReaderFunc) { + this.file = file; + this.schema = schema; + this.options = options; + this.batchedReaderFunc = batchedReaderFunc; + } + + public Builder nameMapping(NameMapping mapping) { + this.nameMapping = mapping; + return this; + } + + public Builder filter(Expression filterExpr) { + this.filter = filterExpr; + return this; + } + + public Builder reuseContainers(boolean reuse) { + this.reuseContainers = reuse; + return this; + } + + public Builder caseSensitive(boolean sensitive) { + this.caseSensitive = sensitive; + return this; + } + + public Builder maxRecordsPerBatch(int maxRecords) { + this.maxRecordsPerBatch = maxRecords; + return this; + } + + public Builder properties(Map<String, String> props) { + this.properties = props; + return this; + } + + public Builder split(Long splitStart, Long splitLength) { + this.start = splitStart; + this.length = splitLength; + return this; + } + + public Builder encryption(ByteBuffer encryptionKey, ByteBuffer aadPrefix) { + this.fileEncryptionKey = encryptionKey; + this.fileAADPrefix = aadPrefix; + return this; + } + + public <T> CometVectorizedParquetReader<T> build() { + return new CometVectorizedParquetReader<>( + file, + schema, + options, + batchedReaderFunc, + nameMapping, + filter, + reuseContainers, + caseSensitive, + maxRecordsPerBatch, + properties, + start, + length, + fileEncryptionKey, + fileAADPrefix); + } + } + + private ReadConf conf = null; + + private ReadConf init() { + if (conf == null) { Review Comment: Is this thread safe? 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