hsiang-c commented on code in PR #13786: URL: https://github.com/apache/iceberg/pull/13786#discussion_r2268062833
########## parquet/src/main/java/org/apache/iceberg/parquet/CometVectorizedParquetReader.java: ########## @@ -0,0 +1,255 @@ +/* + * 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.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.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 Long start = null; + private Long length = null; + private ByteBuffer fileEncryptionKey = null; + private ByteBuffer fileAADPrefix = null; + + public 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; + } + + private ReadConf conf = null; + + private ReadConf init() { + if (conf == null) { + ReadConf readConf = + new ReadConf( + input, + options, + expectedSchema, + filter, + null, + batchReaderFunc, + nameMapping, + reuseContainers, + caseSensitive, + batchSize); + this.conf = readConf.copy(); + return readConf; + } + return conf; + } + + @Override + public CloseableIterator<T> iterator() { + FileIterator<T> iter = + new FileIterator<>(init(), properties, start, length, fileEncryptionKey, fileAADPrefix); + addCloseable(iter); + return iter; + } + + private static class FileIterator<T> implements CloseableIterator<T> { + // private final ParquetFileReader reader; + private final boolean[] shouldSkip; + private final VectorizedReader<T> model; + private final long totalValues; + private final int batchSize; + private final List<Map<ColumnPath, ColumnChunkMetaData>> columnChunkMetadata; + private final boolean reuseContainers; + private int nextRowGroup = 0; + private long nextRowGroupStart = 0; + private long valuesRead = 0; + private T last = null; + private final FileReader cometReader; + + FileIterator( + ReadConf conf, + Map<String, String> properties, + Long start, + Long length, + ByteBuffer fileEncryptionKey, + ByteBuffer fileAADPrefix) { + this.shouldSkip = conf.shouldSkip(); + this.totalValues = conf.totalValues(); + this.reuseContainers = conf.reuseContainers(); + this.model = conf.vectorizedModel(); + this.batchSize = conf.batchSize(); + this.model.setBatchSize(this.batchSize); + this.columnChunkMetadata = conf.columnChunkMetadataForRowGroups(); + this.cometReader = + newCometReader( + conf.file(), + conf.projection(), + properties, + start, + length, + fileEncryptionKey, + fileAADPrefix); + } + + private FileReader newCometReader( + InputFile file, + MessageType projection, + Map<String, String> properties, + Long start, + Long length, + ByteBuffer fileEncryptionKey, + ByteBuffer fileAADPrefix) { + try { + ReadOptions cometOptions = ReadOptions.builder(new Configuration()).build(); + + FileReader fileReader = + new FileReader( + new WrappedInputFile(file), + cometOptions, + properties, + start, + length, + ByteBuffers.toByteArray(fileEncryptionKey), + ByteBuffers.toByteArray(fileAADPrefix)); + + List<ColumnDescriptor> columnDescriptors = projection.getColumns(); + + List<ParquetColumnSpec> specs = Lists.newArrayList(); + + for (ColumnDescriptor descriptor : columnDescriptors) { + ParquetColumnSpec spec = CometTypeUtils.descriptorToParquetColumnSpec(descriptor); + specs.add(spec); + } + + fileReader.setRequestedSchemaFromSpecs(specs); + return fileReader; + } catch (IOException e) { + throw new UncheckedIOException("Failed to open Parquet file: " + file.location(), e); + } + } + + @Override + public boolean hasNext() { + return valuesRead < totalValues; + } + + @Override + public T next() { + if (!hasNext()) { + throw new NoSuchElementException(); + } + if (valuesRead >= nextRowGroupStart) { + advance(); + } + + // batchSize is an integer, so casting to integer is safe + int numValuesToRead = (int) Math.min(nextRowGroupStart - valuesRead, batchSize); + if (reuseContainers) { + this.last = model.read(last, numValuesToRead); + } else { + this.last = model.read(null, numValuesToRead); + } + valuesRead += numValuesToRead; + + return last; + } + + private void advance() { + while (shouldSkip[nextRowGroup]) { + nextRowGroup += 1; + cometReader.skipNextRowGroup(); + } + RowGroupReader pages; + try { + pages = cometReader.readNextRowGroup(); Review Comment: `readNextRowGroup` might return `null` and `setRowGroupInfo` will make use of `pages`. -- This is an automated message from the Apache Git Service. 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