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

Class VectorPTFEvaluatorCountStar

java.lang.Object

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

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

public class VectorPTFEvaluatorCountStar
extends VectorPTFEvaluatorBase

This class evaluates count(*) for a PTF group. Count all rows of the group. No input column/expression.

Field Summary

Fields

Modifier and Type	Field and Description
protected long	count

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

inputColumnNum, LOG, outputColumnNum

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
boolean	canRunOptimizedCalculation(int rowNum, Range range) Whether the evaluator can calculate the result for a given range.
void	evaluateGroupBatch(VectorizedRowBatch batch)
Object	getGroupResult()
ColumnVector.Type	getResultColumnVectorType()
boolean	isGroupResultNull()
void	resetEvaluator()
Object	runOnRange(int rowNum, Range range, VectorPTFGroupBatches batches)
boolean	streamsResult()

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

doLastBatchWork, evaluateInputExpr, getNullsLast, getOutputColumnNum, isCacheableForRange, mapCustomColumns, onPartitionEnd, onResultCalculated, setNullsLast

Methods inherited from class java.lang.Object

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

Field Detail

count

protected long count

Constructor Detail

VectorPTFEvaluatorCountStar

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

Method Detail

evaluateGroupBatch

public void evaluateGroupBatch(VectorizedRowBatch batch)

Specified by:

evaluateGroupBatch in class VectorPTFEvaluatorBase

canRunOptimizedCalculation

public boolean canRunOptimizedCalculation(int rowNum,
                                          Range range)

Description copied from class: VectorPTFEvaluatorBase

Whether the evaluator can calculate the result for a given range. The optimization is supposed to save CPU/IO cost in case of evaluators that can provide the result without iterating through the batches of a range. This method is called before every single calculation, so it lets the evaluator store state whether it's able to run an optimized calculation in a given point of time.

Overrides:

canRunOptimizedCalculation in class VectorPTFEvaluatorBase

runOnRange

public Object runOnRange(int rowNum,
                         Range range,
                         VectorPTFGroupBatches batches)

Overrides:

runOnRange in class VectorPTFEvaluatorBase

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