io.druid.query.aggregation.hyperloglog

Class HyperUniquesSerde

java.lang.Object

io.druid.segment.serde.ComplexMetricSerde

io.druid.query.aggregation.hyperloglog.HyperUniquesSerde

public class HyperUniquesSerde
extends ComplexMetricSerde

Constructor Summary

Constructors

Constructor and Description
HyperUniquesSerde(com.google.common.hash.HashFunction hashFn)

Method Summary

Methods

Modifier and Type	Method and Description
ColumnPartSerde	deserializeColumn(ByteBuffer byteBuffer, ColumnBuilder columnBuilder) Deserializes a ByteBuffer and adds it to the ColumnBuilder.
ComplexMetricExtractor	getExtractor()
ObjectStrategy	getObjectStrategy() This is deprecated because its usage is going to be removed from the code.
String	getTypeName()

Methods inherited from class io.druid.segment.serde.ComplexMetricSerde

fromBytes, inputSizeFn, toBytes

Methods inherited from class java.lang.Object

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

Constructor Detail

HyperUniquesSerde

public HyperUniquesSerde(com.google.common.hash.HashFunction hashFn)

Method Detail

getTypeName

public String getTypeName()

Specified by:

getTypeName in class ComplexMetricSerde

getExtractor

public ComplexMetricExtractor getExtractor()

Specified by:

getExtractor in class ComplexMetricSerde

deserializeColumn

public ColumnPartSerde deserializeColumn(ByteBuffer byteBuffer,
                                ColumnBuilder columnBuilder)

Description copied from class: ComplexMetricSerde

Deserializes a ByteBuffer and adds it to the ColumnBuilder. This method allows for the ComplexMetricSerde to implement it's own versioning scheme to allow for changes of binary format in a forward-compatible manner. The method is also in charge of returning a ColumnPartSerde that knows how to serialize out the object it added to the builder.

Specified by:

deserializeColumn in class ComplexMetricSerde

Parameters:

byteBuffer - the buffer to deserialize

columnBuilder - ColumnBuilder to add the column to

Returns:

a ColumnPartSerde that can serialize out the object that was read from the buffer to the builder

getObjectStrategy

public ObjectStrategy getObjectStrategy()

Description copied from class: ComplexMetricSerde

This is deprecated because its usage is going to be removed from the code. It was introduced before deserializeColumn() existed. This method creates the assumption that Druid knows how to interpret the actual column representation of the data, but I would much prefer that the ComplexMetricSerde objects be in charge of creating and interpreting the whole column, which is what deserializeColumn lets them do.

Specified by:

getObjectStrategy in class ComplexMetricSerde

Returns:

an ObjectStrategy as used by GenericIndexed