brickhouse.udf.collect
Class UnionMaxUDAF

java.lang.Object
  org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver
      brickhouse.udf.collect.UnionMaxUDAF

All Implemented Interfaces:

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver, org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver2

public class UnionMaxUDAF
extends org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver

UDAF to merge a union of maps, but only hold on the keys with the top 20 values

Nested Class Summary

static class

UnionMaxUDAF.MapCollectMaxUDAFEvaluator

Field Summary

static int

DEFAULT_MAX_VALUES

Constructor Summary

UnionMaxUDAF()

Method Summary

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator

getEvaluator(org.apache.hadoop.hive.serde2.typeinfo.TypeInfo[] parameters)

Methods inherited from class org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver

getEvaluator

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAX_VALUES

public static int DEFAULT_MAX_VALUES

Constructor Detail

UnionMaxUDAF

public UnionMaxUDAF()

Method Detail

getEvaluator

public org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator getEvaluator(org.apache.hadoop.hive.serde2.typeinfo.TypeInfo[] parameters)
                                                                        throws org.apache.hadoop.hive.ql.parse.SemanticException

Specified by:

getEvaluator in interface org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver

Overrides:

getEvaluator in class org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver

Throws:

org.apache.hadoop.hive.ql.parse.SemanticException