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

Class GenericUDAFCumeDist.GenericUDAFHypotheticalSetCumeDistEvaluator

java.lang.Object

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

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator

org.apache.hadoop.hive.ql.udf.generic.GenericUDAFCumeDist.GenericUDAFHypotheticalSetCumeDistEvaluator

All Implemented Interfaces:

Closeable, AutoCloseable

Enclosing class:

GenericUDAFCumeDist

public static class GenericUDAFCumeDist.GenericUDAFHypotheticalSetCumeDistEvaluator
extends GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator

Evaluator for calculating the cumulative distribution. SELECT cume_dist(expression) WITHIN GROUP (ORDER BY col1) Implementation is based on hypothetical rank calculation: (rank + 1) / (count + 1) Differences: - rows which has equal column value with the specified expression value should be counted in the rank - the return value type of this function is double.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator

GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator.CompareResult, GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator.HypotheticalSetRankBuffer, GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator.RankAssets

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator

GenericUDAFEvaluator.AbstractAggregationBuffer, GenericUDAFEvaluator.AggregationBuffer, GenericUDAFEvaluator.AggregationType, GenericUDAFEvaluator.Mode

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator

COUNT_FIELD, PARTIAL_RANK_OI, RANK_FIELD

Fields inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator

partitionEvaluator

Constructor Summary

Constructors

Constructor and Description
GenericUDAFHypotheticalSetCumeDistEvaluator()

Method Summary

Modifier and Type	Method and Description
Object	terminate(GenericUDAFEvaluator.AggregationBuffer agg) Get final aggregation result.

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

compare, getNewAggregationBuffer, init, initPartial2AndFinalOI, iterate, merge, reset, terminatePartial

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

aggregate, close, configure, createPartitionEvaluator, estimate, evaluate, getExprString, getPartitionWindowingEvaluator, getWindowingEvaluator, isEstimable

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericUDAFHypotheticalSetCumeDistEvaluator

public GenericUDAFHypotheticalSetCumeDistEvaluator()

Method Detail

terminate

public Object terminate(GenericUDAFEvaluator.AggregationBuffer agg)
                 throws HiveException

Description copied from class: GenericUDAFEvaluator

Get final aggregation result.

Overrides:

terminate in class GenericUDAFRank.GenericUDAFHypotheticalSetRankEvaluator

Returns:

final aggregation result.

Throws:

HiveException