org.apache.datasketches.hive.hll

Class UnionSketchUDF

java.lang.Object

org.apache.hadoop.hive.ql.exec.UDF

org.apache.datasketches.hive.hll.UnionSketchUDF

public class UnionSketchUDF
extends org.apache.hadoop.hive.ql.exec.UDF

Hive union sketch UDF.

Constructor Summary

Constructors

Constructor and Description
UnionSketchUDF()

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.io.BytesWritable	evaluate(org.apache.hadoop.io.BytesWritable firstSketch, org.apache.hadoop.io.BytesWritable secondSketch) Union two sketches using default lgK an target HLL type
org.apache.hadoop.io.BytesWritable	evaluate(org.apache.hadoop.io.BytesWritable firstSketch, org.apache.hadoop.io.BytesWritable secondSketch, int lgK) Union two sketches given explicit lgK and using default target HLL type
org.apache.hadoop.io.BytesWritable	evaluate(org.apache.hadoop.io.BytesWritable firstSketch, org.apache.hadoop.io.BytesWritable secondSketch, int lgK, String type) Union two sketches given explicit lgK and target HLL type

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

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

Constructor Detail

UnionSketchUDF

public UnionSketchUDF()

Method Detail

evaluate

public org.apache.hadoop.io.BytesWritable evaluate(org.apache.hadoop.io.BytesWritable firstSketch,
                                                   org.apache.hadoop.io.BytesWritable secondSketch,
                                                   int lgK,
                                                   String type)

Union two sketches given explicit lgK and target HLL type

Parameters:

firstSketch - first sketch to be unioned.

secondSketch - second sketch to be unioned.

lgK - final output lgK This must be between 4 and 21.

type - final output HLL type

Returns:

resulting sketch of union.

evaluate

public org.apache.hadoop.io.BytesWritable evaluate(org.apache.hadoop.io.BytesWritable firstSketch,
                                                   org.apache.hadoop.io.BytesWritable secondSketch,
                                                   int lgK)

Union two sketches given explicit lgK and using default target HLL type

Parameters:

firstSketch - first sketch to be unioned.

secondSketch - second sketch to be unioned.

lgK - final output lgK This must be between 4 and 21.

Returns:

resulting sketch of union.

evaluate

public org.apache.hadoop.io.BytesWritable evaluate(org.apache.hadoop.io.BytesWritable firstSketch,
                                                   org.apache.hadoop.io.BytesWritable secondSketch)

Union two sketches using default lgK an target HLL type

Parameters:

firstSketch - first sketch to be unioned.

secondSketch - second sketch to be unioned.

Returns:

resulting sketch of union.