org.apache.druid.query.groupby.orderby

Class NoopLimitSpec

java.lang.Object

org.apache.druid.query.groupby.orderby.NoopLimitSpec

All Implemented Interfaces:

Cacheable, LimitSpec

public final class NoopLimitSpec
extends Object
implements LimitSpec

Field Summary

Fields

Modifier and Type	Field and Description
static NoopLimitSpec	INSTANCE

Method Summary

Modifier and Type	Method and Description
com.google.common.base.Function<Sequence<ResultRow>,Sequence<ResultRow>>	build(GroupByQuery query) Returns a function that applies a limit to an input sequence that is assumed to be sorted on dimensions.
boolean	equals(Object other)
LimitSpec	filterColumns(Set<String> names) Discard sorting columns not contained in given set.
byte[]	getCacheKey()
int	hashCode()
static NoopLimitSpec	instance()
LimitSpec	merge(LimitSpec other)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.druid.query.groupby.orderby.LimitSpec

nullToNoopLimitSpec

Field Detail

INSTANCE

public static final NoopLimitSpec INSTANCE

Method Detail

instance

public static NoopLimitSpec instance()

build

public com.google.common.base.Function<Sequence<ResultRow>,Sequence<ResultRow>> build(GroupByQuery query)

Description copied from interface: LimitSpec

Returns a function that applies a limit to an input sequence that is assumed to be sorted on dimensions.

Specified by:

build in interface LimitSpec

Parameters:

query - the query that this limit spec belongs to

Returns:

limit function

merge

public LimitSpec merge(LimitSpec other)

Specified by:

merge in interface LimitSpec

filterColumns

public LimitSpec filterColumns(Set<String> names)

Description copied from interface: LimitSpec

Discard sorting columns not contained in given set. This is used when generating new queries, e.g. to process subtotal spec in GroupBy query.

Specified by:

filterColumns in interface LimitSpec

Parameters:

names - columns names to keep

Returns:

new LimitSpec that works with fitlered set of columns

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getCacheKey

public byte[] getCacheKey()

Specified by:

getCacheKey in interface Cacheable