org.apache.drill.exec.store.easy.sequencefile

Class SequenceFileRecordReader

java.lang.Object

org.apache.drill.exec.store.AbstractRecordReader

org.apache.drill.exec.store.easy.sequencefile.SequenceFileRecordReader

All Implemented Interfaces:

AutoCloseable, RecordReader

public class SequenceFileRecordReader
extends AbstractRecordReader

Field Summary

Fields inherited from class org.apache.drill.exec.store.AbstractRecordReader

DEFAULT_TEXT_COLS_TO_READ

Fields inherited from interface org.apache.drill.exec.store.RecordReader

ALLOCATOR_INITIAL_RESERVATION, ALLOCATOR_MAX_RESERVATION

Constructor Summary

Constructors

Constructor and Description
SequenceFileRecordReader(org.apache.hadoop.mapred.FileSplit split, DrillFileSystem dfs, String queryUserName, String opUserName)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
protected boolean	isSkipQuery() Returns true if reader should skip all of the columns, reporting number of records only.
int	next() Increments this record reader forward, writing via the provided output mutator into the output batch.
void	setup(OperatorContext context, OutputMutator output) Configure the RecordReader with the provided schema and the record batch that should be written to.

Methods inherited from class org.apache.drill.exec.store.AbstractRecordReader

allocate, getColumns, getDefaultColumnsToRead, isStarQuery, setColumns, toString, transformColumns

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceFileRecordReader

public SequenceFileRecordReader(org.apache.hadoop.mapred.FileSplit split,
                        DrillFileSystem dfs,
                        String queryUserName,
                        String opUserName)

Method Detail

isSkipQuery

protected boolean isSkipQuery()

Description copied from class: AbstractRecordReader

Returns true if reader should skip all of the columns, reporting number of records only. Handling of a skip query is storage plugin-specific.

Overrides:

isSkipQuery in class AbstractRecordReader

setup

public void setup(OperatorContext context,
         OutputMutator output)
           throws ExecutionSetupException

Description copied from interface: RecordReader

Configure the RecordReader with the provided schema and the record batch that should be written to.

Parameters:

context - operator context for the reader

output - The place where output for a particular scan should be written. The record reader is responsible for mutating the set of schema values for that particular record.

Throws:

ExecutionSetupException

next

public int next()

Description copied from interface: RecordReader

Increments this record reader forward, writing via the provided output mutator into the output batch.

Returns:

The number of additional records added to the output.

close

public void close()