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

Class MathFuncDoubleToDouble

java.lang.Object

org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

org.apache.hadoop.hive.ql.exec.vector.expressions.MathFuncDoubleToDouble

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

FuncLogWithBaseDoubleToDouble, FuncPowerDoubleToDouble, PosModDoubleToDouble, RoundWithNumDigitsDoubleToDouble

public abstract class MathFuncDoubleToDouble
extends VectorExpression

Implement vectorized math function that takes a double (and optionally additional constant argument(s)) and returns long. May be used for functions like ROUND(d, N), Pow(a, p) etc. Do NOT use this for simple math functions like sin/cos/exp etc. that just take a single argument. For those, modify the template ColumnUnaryFunc.txt and expand the template to generate needed classes.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

VectorExpression.Type

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

childExpressions, inputTypes, outputType

Constructor Summary

Constructors

Constructor and Description
MathFuncDoubleToDouble()
MathFuncDoubleToDouble(int colNum, int outputColumn)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	cleanup(DoubleColumnVector outputColVector, int[] sel, boolean selectedInUse, int n)
void	evaluate(VectorizedRowBatch batch) This is the primary method to implement expression logic.
protected abstract double	func(double d)
int	getColNum()
int	getOutputColumn() Returns the index of the output column in the array of column vectors.
String	getOutputType() Returns type of the output column.
void	setColNum(int colNum)
void	setOutputColumn(int outputColumn)

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

evaluateChildren, getChildExpressions, getDescriptor, getInputTypes, setChildExpressions, setInputTypes, setOutputType, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

MathFuncDoubleToDouble

public MathFuncDoubleToDouble(int colNum,
                      int outputColumn)

MathFuncDoubleToDouble

public MathFuncDoubleToDouble()

Method Detail

func

protected abstract double func(double d)

evaluate

public void evaluate(VectorizedRowBatch batch)

Description copied from class: VectorExpression

This is the primary method to implement expression logic.

Specified by:

evaluate in class VectorExpression

cleanup

protected void cleanup(DoubleColumnVector outputColVector,
           int[] sel,
           boolean selectedInUse,
           int n)

getOutputColumn

public int getOutputColumn()

Description copied from class: VectorExpression

Returns the index of the output column in the array of column vectors. If not applicable, -1 is returned.

Specified by:

getOutputColumn in class VectorExpression

Returns:

Index of the output column

setOutputColumn

public void setOutputColumn(int outputColumn)

getColNum

public int getColNum()

setColNum

public void setColNum(int colNum)

getOutputType

public String getOutputType()

Description copied from class: VectorExpression

Returns type of the output column.

Overrides:

getOutputType in class VectorExpression