Package org.apache.druid.query.groupby.having

Class NeverHavingSpec

java.lang.Object

org.apache.druid.query.groupby.having.NeverHavingSpec

All Implemented Interfaces:

Cacheable, HavingSpec

public class NeverHavingSpec
extends Object
implements HavingSpec

A "having" spec that always evaluates to false

Constructor Summary

Constructors

Constructor	Description
NeverHavingSpec()

Method Summary

Modifier and Type	Method	Description
boolean	eval(ResultRow row)	Evaluates if a given row satisfies the having spec.
byte[]	getCacheKey()	Get a byte array used as a cache key.
void	setQuery(GroupByQuery query)	Informs this HavingSpec that rows passed to "eval" will originate from a particular groupBy query.

Methods inherited from class java.lang.Object

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

Constructor Detail

NeverHavingSpec

public NeverHavingSpec()

Method Detail

setQuery

public void setQuery(GroupByQuery query)

Description copied from interface: HavingSpec

Informs this HavingSpec that rows passed to "eval" will originate from a particular groupBy query.

Specified by:

setQuery in interface HavingSpec

eval

public boolean eval(ResultRow row)

Description copied from interface: HavingSpec

Evaluates if a given row satisfies the having spec.

Specified by:

eval in interface HavingSpec

Parameters:

row - A Row of data that may contain aggregated values

Returns:

true if the given row satisfies the having spec. False otherwise.

getCacheKey

public byte[] getCacheKey()

Description copied from interface: Cacheable

Get a byte array used as a cache key.

Specified by:

getCacheKey in interface Cacheable

Returns:

a cache key