dongjoon-hyun commented on a change in pull request #34471: URL: https://github.com/apache/spark/pull/34471#discussion_r744038286
########## File path: sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedDeltaBinaryPackedReader.java ########## @@ -0,0 +1,319 @@ +/* + * 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.spark.sql.execution.datasources.parquet; + +import java.nio.ByteBuffer; +import org.apache.parquet.Preconditions; +import org.apache.parquet.bytes.ByteBufferInputStream; +import org.apache.parquet.bytes.BytesUtils; +import org.apache.parquet.column.values.ValuesReader; +import org.apache.parquet.column.values.bitpacking.BytePackerForLong; +import org.apache.parquet.column.values.bitpacking.Packer; +import org.apache.parquet.io.ParquetDecodingException; +import org.apache.parquet.io.api.Binary; +import org.apache.spark.sql.execution.vectorized.WritableColumnVector; + +import java.io.IOException; + +/** + * An implementation of the Parquet DELTA_BINARY_PACKED decoder that supports the vectorized + * interface. + */ +public class VectorizedDeltaBinaryPackedReader extends ValuesReader + implements VectorizedValuesReader { + + // header data + private int blockSizeInValues; + private int miniBlockNumInABlock; + private int totalValueCount; + private long firstValue; + + private int miniBlockSizeInValues; + + // values read by the caller + private int valuesRead = 0; + + //variables to keep state of the current block and miniblock + private long lastValueRead; + private long minDeltaInCurrentBlock; + private int currentMiniBlock = 0; + private int[] bitWidths; // bit widths for each miniblock in the current block + private int remainingInBlock = 0; // values in current block still to be read + private int remainingInMiniBlock = 0; // values in current mini block still to be read + private long[] unpackedValuesBuffer; + + private ByteBufferInputStream in; + + @SuppressWarnings("unused") + @Override + public void initFromPage(/*unused*/int valueCount, ByteBufferInputStream in) throws IOException { + Preconditions.checkArgument(valueCount >= 1, + "Page must have at least one value, but it has " + valueCount); + this.in = in; + + // Read the header + this.blockSizeInValues = BytesUtils.readUnsignedVarInt(in); + this.miniBlockNumInABlock = BytesUtils.readUnsignedVarInt(in); + double miniSize = (double) blockSizeInValues / miniBlockNumInABlock; + Preconditions.checkArgument(miniSize % 8 == 0, + "miniBlockSize must be multiple of 8, but it's " + miniSize); + this.miniBlockSizeInValues = (int) miniSize; + this.totalValueCount = BytesUtils.readUnsignedVarInt(in); + this.bitWidths = new int[miniBlockNumInABlock]; + + // read the first value + firstValue = BytesUtils.readZigZagVarLong(in); + Review comment: nit. Let's remove redundant empty line. -- 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: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
