pvary commented on code in PR #12774: URL: https://github.com/apache/iceberg/pull/12774#discussion_r2163715964
########## core/src/main/java/org/apache/iceberg/io/FileAccessFactory.java: ########## @@ -0,0 +1,139 @@ +/* + * 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.io; + +import org.apache.iceberg.FileFormat; +import org.apache.iceberg.data.Record; +import org.apache.iceberg.deletes.PositionDelete; + +/** + * Interface that provides a unified abstraction for converting between data file formats and + * input/output data representations. + * + * <p>FileAccessFactory serves as a bridge between storage formats ({@link FileFormat}) and expected + * input/output data structures, optimizing performance through direct conversion without + * intermediate representations. File format implementations handle the low-level parsing details + * while the object model determines the in-memory representation used for the parsed data. + * Together, these provide a consistent API for consuming data files while optimizing for specific + * processing engines. + * + * <p>Iceberg provides these built-in object models: + * + * <ul> + * <li><strong>generic</strong> - for {@link Record} objects (engine-agnostic) + * <li><strong>spark</strong> - for Apache Spark InternalRow objects + * <li><strong>spark-vectorized</strong> - for columnar batch processing in Spark (not supported + * with {@link FileFormat#AVRO}) + * <li><strong>flink</strong> - for Apache Flink RowData objects + * <li><strong>arrow</strong> - for Apache Arrow columnar format (only supported with {@link + * FileFormat#PARQUET}) + * </ul> + * + * <p>Processing engines can implement custom object models to integrate with Iceberg's file reading + * and writing capabilities. + * + * @param <E> input schema type used when converting input data to the file format + * @param <D> output type used for reading data, and input type for writing data and deletes + */ +public interface FileAccessFactory<E, D> { Review Comment: This is a sizable change. I will first revisit https://github.com/apache/iceberg/pull/12774#discussion_r2162731545, and will revert if we still need this ########## core/src/main/java/org/apache/iceberg/io/ReadBuilder.java: ########## @@ -0,0 +1,136 @@ +/* + * 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.io; + +import java.nio.ByteBuffer; +import java.util.Map; +import org.apache.iceberg.Schema; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.mapping.NameMapping; + +/** + * Builder interface for creating file readers across supported data file formats. The {@link + * FileAccessFactory} implementations provides appropriate {@link ReadBuilder} instances + * + * <p>The {@link ReadBuilder} follows the builder pattern to configure and create {@link + * CloseableIterable} instances that read data from source files. Configuration options include + * schema projection, predicate filtering, record batching, and encryption settings. + * + * <p>This interface is directly exposed to users for parameterizing readers. + * + * @param <B> the concrete builder type for method chaining + * @param <D> the output data type produced by the reader + */ +public interface ReadBuilder<B extends ReadBuilder<B, D>, D> { + /** The configuration key for the batch size in the case of vectorized reads. */ + String RECORDS_PER_BATCH_KEY = "iceberg.records-per-batch"; + + /** + * Restricts the read to the given range: [start, start + length). + * + * @param newStart the start position for this read + * @param newLength the length of the range this read should scan + */ + B split(long newStart, long newLength); + + /** Read only the given columns. */ Review Comment: changed -- This is an automated message from the Apache Git Service. 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