pvary commented on code in PR #12298: URL: https://github.com/apache/iceberg/pull/12298#discussion_r2001465756
########## core/src/main/java/org/apache/iceberg/io/datafile/ReadBuilder.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.datafile; + +import java.nio.ByteBuffer; +import java.util.Map; +import org.apache.iceberg.Schema; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.mapping.NameMapping; + +/** + * Builder API for reading Iceberg data files. + * + * @param <R> type of the reader + * @param <F> type of the records which are filtered by {@link DeleteFilter} + */ +public interface ReadBuilder<R extends ReadBuilder<R, F>, F> { + /** + * 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 + */ + R split(long newStart, long newLength); + + /** Read only the given columns. */ + R project(Schema newSchema); + + /** + * Sets the reader to case-sensitive when matching column names. Readers might decide not to + * implement this feature. The default is behavior is case-sensitive. + */ + default R caseInsensitive() { + return caseSensitive(false); + } + + default R caseSensitive(boolean newCaseSensitive) { + // Just ignore case sensitivity if not available + return (R) this; + } + + /** + * Enables record filtering. Some readers might not be able to do reader side filtering. In this + * case the reader might decide on returning every row. It is the caller's responsibility to apply + * the filter again. + */ + default R filterRecords(boolean newFilterRecords) { + // Skip filtering if not available + return (R) this; + } + + /** + * Pushes down the {@link Expression} filter for the reader to prevent reading unnecessary + * records. Some readers might not be able to filter some part of the exception. In this case the + * reader might return unfiltered or partially filtered rows. It is the caller's responsibility to + * apply the filter again. + */ + default R filter(Expression newFilter) { + // Skip filtering if not available + return (R) this; + } + + /** + * Sets configuration key/value pairs for the reader. Reader builders could ignore configuration + * keys not known for them. + */ + R set(String key, String value); + + /** Enables reusing the containers returned by the reader. Decreases pressure on GC. */ + default R reuseContainers() { + return reuseContainers(true); + } + + /** + * Reusing the containers returned by the reader decreases pressure on GC. Readers could decide to + * ignore the user provided setting if is not supported by them. + */ + R reuseContainers(boolean newReuseContainers); + + /** Sets the batch size for vectorized readers. */ + default R recordsPerBatch(int numRowsPerBatch) { + throw new UnsupportedOperationException("Not supported"); + } + + /** + * Accessors for constant field values. Used for calculating values it the result which are coming + * from metadata, and not coming from the data files themselves. + */ + R idToConstant(Map<Integer, ?> newIdConstant); + + /** + * Used for filtering out deleted records on the reader level. If delete filtering is not + * supported by the reader then the delete filter is ignored, and unfiltered results are returned. + * It is the caller's responsibility to apply the filter again. + */ + default R withDeleteFilter(DeleteFilter<F> newDeleteFilter) { Review Comment: Moved to the functionality to the `Parquet.SupportsDeleteFilter` for now. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
