datasources/parquet/VectorizedValuesReader.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.sql.execution.datasources.parquet;
0019
0020 import org.apache.spark.sql.execution.vectorized.WritableColumnVector;
0021
0022 import org.apache.parquet.io.api.Binary;
0023
0024 /**
0025  * Interface for value decoding that supports vectorized (aka batched) decoding.
0026  * TODO: merge this into parquet-mr.
0027  */
0028 public interface VectorizedValuesReader {
0029   boolean readBoolean();
0030   byte readByte();
0031   int readInteger();
0032   long readLong();
0033   float readFloat();
0034   double readDouble();
0035   Binary readBinary(int len);
0036
0037   /*
0038    * Reads `total` values into `c` start at `c[rowId]`
0039    */
0040   void readBooleans(int total, WritableColumnVector c, int rowId);
0041   void readBytes(int total, WritableColumnVector c, int rowId);
0042   void readIntegers(int total, WritableColumnVector c, int rowId);
0043   void readIntegersWithRebase(int total, WritableColumnVector c, int rowId, boolean failIfRebase);
0044   void readLongs(int total, WritableColumnVector c, int rowId);
0045   void readLongsWithRebase(int total, WritableColumnVector c, int rowId, boolean failIfRebase);
0046   void readFloats(int total, WritableColumnVector c, int rowId);
0047   void readDoubles(int total, WritableColumnVector c, int rowId);
0048   void readBinary(int total, WritableColumnVector c, int rowId);
0049 }