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

Class GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator

java.lang.Object

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

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

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

All Implemented Interfaces:

Closeable, AutoCloseable

Enclosing class:

GenericUDAFPercentRank

public static class GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator
extends GenericUDAFRank.GenericUDAFAbstractRankEvaluator

Nested Class Summary

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

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

Constructor Summary

Constructors

Constructor and Description
GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
ObjectInspector	init(GenericUDAFEvaluator.Mode m, ObjectInspector[] parameters) Initialize the evaluator.
Object	terminate(GenericUDAFEvaluator.AggregationBuffer agg) Get final aggregation result.

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

getNewAggregationBuffer, isStreaming, iterate, merge, nextRank, reset, terminatePartial

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

aggregate, close, configure, evaluate, getWindowingEvaluator, isEstimable

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator

public GenericUDAFPercentRank.GenericUDAFPercentRankEvaluator()

Method Detail

init

public ObjectInspector init(GenericUDAFEvaluator.Mode m,
                   ObjectInspector[] parameters)
                     throws HiveException

Description copied from class: GenericUDAFEvaluator

Initialize the evaluator.

Overrides:

init in class GenericUDAFRank.GenericUDAFAbstractRankEvaluator

Parameters:

m - The mode of aggregation.

parameters - The ObjectInspector for the parameters: In PARTIAL1 and COMPLETE mode, the parameters are original data; In PARTIAL2 and FINAL mode, the parameters are just partial aggregations (in that case, the array will always have a single element).

Returns:

The ObjectInspector for the return value. In PARTIAL1 and PARTIAL2 mode, the ObjectInspector for the return value of terminatePartial() call; In FINAL and COMPLETE mode, the ObjectInspector for the return value of terminate() call. NOTE: We need ObjectInspector[] (in addition to the TypeInfo[] in GenericUDAFResolver) for 2 reasons: 1. ObjectInspector contains more information than TypeInfo; and GenericUDAFEvaluator.init at execution time. 2. We call GenericUDAFResolver.getEvaluator at compilation time,

Throws:

HiveException

terminate

public Object terminate(GenericUDAFEvaluator.AggregationBuffer agg)
                 throws HiveException

Description copied from class: GenericUDAFEvaluator

Get final aggregation result.

Overrides:

terminate in class GenericUDAFRank.GenericUDAFAbstractRankEvaluator

Returns:

final aggregation result.

Throws:

HiveException