Package org.apache.druid.query.groupby.epinephelinae

Interface Grouper.KeySerdeFactory<T>

Enclosing interface:

Grouper<KeyType>

public static interface Grouper.KeySerdeFactory<T>

Method Summary

Modifier and Type	Method	Description
T	copyKey(T key)	Copies a key.
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 Details

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.

copyKey

T copyKey(T key)

Copies a key. Required if the key from an Grouper.Entry from Grouper.iterator(boolean) will be retained past the following call to next().

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.