org.apache.hadoop.hive.ql.io

Class ZeroRowsInputFormat

java.lang.Object

org.apache.hadoop.hive.ql.io.NullRowsInputFormat

org.apache.hadoop.hive.ql.io.ZeroRowsInputFormat

All Implemented Interfaces:

VectorizedInputFormatInterface, org.apache.hadoop.mapred.InputFormat<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>, org.apache.hadoop.mapred.JobConfigurable

public class ZeroRowsInputFormat
extends NullRowsInputFormat
implements VectorizedInputFormatInterface

Same as OneNullRowInputFormat, but with 0 rows. There's no way to store smth like OperatorDesc in InputFormat, so this is how it is. We could perhaps encode the number of null rows in the null path. However, NullIF can be used without using NullFS, so that would not be possible.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ZeroRowsInputFormat.ZeroRowsRecordReader

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.io.NullRowsInputFormat

NullRowsInputFormat.DummyInputSplit, NullRowsInputFormat.NullRowsRecordReader

Constructor Summary

Constructors

Constructor and Description
ZeroRowsInputFormat()

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.mapred.RecordReader<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>	getRecordReader(org.apache.hadoop.mapred.InputSplit split, org.apache.hadoop.mapred.JobConf conf, org.apache.hadoop.mapred.Reporter arg2)

Methods inherited from class org.apache.hadoop.hive.ql.io.NullRowsInputFormat

configure, getSplits, getSupportedFeatures

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.hive.ql.exec.vector.VectorizedInputFormatInterface

getSupportedFeatures

Constructor Detail

ZeroRowsInputFormat

public ZeroRowsInputFormat()

Method Detail

getRecordReader

public org.apache.hadoop.mapred.RecordReader<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable> getRecordReader(org.apache.hadoop.mapred.InputSplit split,
                                                                                                                                  org.apache.hadoop.mapred.JobConf conf,
                                                                                                                                  org.apache.hadoop.mapred.Reporter arg2)
                                                                                                                           throws IOException

Specified by:

getRecordReader in interface org.apache.hadoop.mapred.InputFormat<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Overrides:

getRecordReader in class NullRowsInputFormat

Throws:

IOException