org.apache.hadoop.hive.ql.exec.vector.ptf

Class VectorPTFEvaluatorDoubleLastValue

java.lang.Object

org.apache.hadoop.hive.ql.exec.vector.ptf.VectorPTFEvaluatorBase

org.apache.hadoop.hive.ql.exec.vector.ptf.VectorPTFEvaluatorDoubleLastValue

public class VectorPTFEvaluatorDoubleLastValue
extends VectorPTFEvaluatorBase

This class evaluates double first_value() for a PTF group. We capture the last value from the last batch. It can be NULL. It becomes the group value.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	isGroupResultNull
protected double	lastValue

Fields inherited from class org.apache.hadoop.hive.ql.exec.vector.ptf.VectorPTFEvaluatorBase

inputColumnNum, LOG, outputColumnNum

Constructor Summary

Constructors

Constructor and Description
VectorPTFEvaluatorDoubleLastValue(WindowFrameDef windowFrameDef, VectorExpression inputVecExpr, int outputColumnNum)

Method Summary

Modifier and Type	Method and Description
void	evaluateGroupBatch(VectorizedRowBatch batch)
Object	getGroupResult()
ColumnVector.Type	getResultColumnVectorType()
boolean	isCacheableForRange() Whether the results calculated by this evaluator are eligible for caching by PTFValueCache.
boolean	isGroupResultNull()
void	resetEvaluator()
boolean	streamsResult()

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.ptf.VectorPTFEvaluatorBase

canRunOptimizedCalculation, doLastBatchWork, evaluateInputExpr, getNullsLast, getOutputColumnNum, mapCustomColumns, onPartitionEnd, onResultCalculated, runOnRange, setNullsLast

Methods inherited from class java.lang.Object

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

Field Detail

isGroupResultNull

protected boolean isGroupResultNull

lastValue

protected double lastValue

Constructor Detail

VectorPTFEvaluatorDoubleLastValue

public VectorPTFEvaluatorDoubleLastValue(WindowFrameDef windowFrameDef,
                                         VectorExpression inputVecExpr,
                                         int outputColumnNum)

Method Detail

evaluateGroupBatch

public void evaluateGroupBatch(VectorizedRowBatch batch)
                        throws HiveException

Specified by:

evaluateGroupBatch in class VectorPTFEvaluatorBase

Throws:

HiveException

streamsResult

public boolean streamsResult()

Specified by:

streamsResult in class VectorPTFEvaluatorBase

isGroupResultNull

public boolean isGroupResultNull()

Overrides:

isGroupResultNull in class VectorPTFEvaluatorBase

getResultColumnVectorType

public ColumnVector.Type getResultColumnVectorType()

Specified by:

getResultColumnVectorType in class VectorPTFEvaluatorBase

getGroupResult

public Object getGroupResult()

Overrides:

getGroupResult in class VectorPTFEvaluatorBase

resetEvaluator

public void resetEvaluator()

Specified by:

resetEvaluator in class VectorPTFEvaluatorBase

isCacheableForRange

public boolean isCacheableForRange()

Description copied from class: VectorPTFEvaluatorBase

Whether the results calculated by this evaluator are eligible for caching by PTFValueCache. A result of an evaluator is cacheable, if it returns the same value for the same range within the a PTF partition, regardless of which row the current result is calculated for. That's typically true for most of the evaluators (e.g. sum), but not true for e.g. lead/lag/first_value/last_value, as their results only depend on a relation between the current and some reference row (instead of ranges).

Overrides:

isCacheableForRange in class VectorPTFEvaluatorBase