io.druid.query.groupby.epinephelinae

Interface Grouper.KeySerdeFactory<T>

Enclosing interface:

Grouper<KeyType>

public static interface Grouper.KeySerdeFactory<T>

Method Summary

Modifier and Type	Method and Description
Grouper.KeySerde<T>	factorize() Create a new Grouper.KeySerde, which may be stateful.
Grouper.KeySerde<T>	factorizeWithDictionary(List<String> dictionary) Create a new Grouper.KeySerde with the given dictionary.
long	getMaxDictionarySize() Return max dictionary size threshold.
Comparator<Grouper.Entry<T>>	objectComparator(boolean forceDefaultOrder) Return an object that knows how to compare two serialized key instances.

Method Detail

getMaxDictionarySize

long getMaxDictionarySize()

Return max dictionary size threshold.

Returns:

max dictionary size

factorize

Grouper.KeySerde<T> factorize()

Create a new Grouper.KeySerde, which may be stateful.

factorizeWithDictionary

Grouper.KeySerde<T> factorizeWithDictionary(List<String> dictionary)

Create a new Grouper.KeySerde with the given dictionary.

objectComparator

Comparator<Grouper.Entry<T>> objectComparator(boolean forceDefaultOrder)

Return an object that knows how to compare two serialized key instances. Will be called by the Grouper.iterator(boolean) method if sorting is enabled.

Parameters:

forceDefaultOrder - Return a comparator that sorts by the key in default lexicographic ascending order, regardless of any other conditions (e.g., presence of OrderBySpecs).

Returns:

comparator for key objects.