Package org.apache.druid.query.aggregation.firstlast.first

Class StringFirstAggregator

java.lang.Object

org.apache.druid.query.aggregation.firstlast.first.StringFirstAggregator

All Implemented Interfaces:

Closeable, AutoCloseable, Aggregator

public class StringFirstAggregator
extends Object
implements Aggregator

Field Summary

Fields

Modifier and Type	Field	Description
protected long	firstTime
protected String	firstValue

Constructor Summary

Constructors

Constructor	Description
StringFirstAggregator(BaseLongColumnValueSelector timeSelector, BaseObjectColumnValueSelector<?> valueSelector, int maxStringBytes, boolean needsFoldCheck)

Method Summary

Modifier and Type	Method	Description
void	aggregate()	Performs aggregation.
void	close()
Object	get()
double	getDouble()	The default implementation casts Aggregator.getFloat() to double.
float	getFloat()
long	getLong()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.aggregation.Aggregator

aggregateWithSize, isNull

Field Details

firstTime

protected long firstTime

firstValue

protected String firstValue

Constructor Details

StringFirstAggregator

public StringFirstAggregator(BaseLongColumnValueSelector timeSelector,
 BaseObjectColumnValueSelector<?> valueSelector,
 int maxStringBytes,
 boolean needsFoldCheck)

Method Details

aggregate

public void aggregate()

Description copied from interface: Aggregator

Performs aggregation.

Specified by:

aggregate in interface Aggregator

get

public Object get()

Specified by:

get in interface Aggregator

getFloat

public float getFloat()

Specified by:

getFloat in interface Aggregator

getLong

public long getLong()

Specified by:

getLong in interface Aggregator

getDouble

public double getDouble()

Description copied from interface: Aggregator

The default implementation casts Aggregator.getFloat() to double. This default method is added to enable smooth backward compatibility, please re-implement it if your aggregators work with numeric double columns.

Specified by:

getDouble in interface Aggregator

close

public void close()

Specified by:

close in interface Aggregator

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable