org.apache.drill.exec.expr

Class DrillFuncHolderExpr

java.lang.Object

org.apache.drill.common.expression.LogicalExpressionBase

org.apache.drill.common.expression.FunctionHolderExpression

org.apache.drill.exec.expr.DrillFuncHolderExpr

All Implemented Interfaces:

Iterable<LogicalExpression>, LogicalExpression

public class DrillFuncHolderExpr
extends FunctionHolderExpression
implements Iterable<LogicalExpression>

Represents the call of a function within a query and includes the actual arguments and a reference to the function declaration (as a "function holder.")

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.common.expression.LogicalExpression

LogicalExpression.De, LogicalExpression.Se

Field Summary

Fields inherited from class org.apache.drill.common.expression.FunctionHolderExpression

args, nameUsed

Constructor Summary

Constructors

Constructor and Description
DrillFuncHolderExpr(String nameUsed, DrillFuncHolder holder, List<LogicalExpression> args, ExpressionPosition pos)

Method Summary

Modifier and Type	Method and Description
boolean	argConstantOnly(int i) constant input expected for i'th argument?
DrillFuncHolderExpr	copy(List<LogicalExpression> args)
int	getCumulativeCost()
DrillFuncHolder	getHolder() Return the underlying function implementation holder.
DrillSimpleFunc	getInterpreter()
TypeProtos.MajorType	getMajorType()
int	getSelfCost()
boolean	isAggregating()
boolean	isRandom() Is the function output non-deterministic?
Iterator<LogicalExpression>	iterator()
void	setInterpreter(DrillSimpleFunc interpreter)

Methods inherited from class org.apache.drill.common.expression.FunctionHolderExpression

accept, getFieldReference, getName, setFieldReference, toString

Methods inherited from class org.apache.drill.common.expression.LogicalExpressionBase

getDescription, getPosition, i

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

DrillFuncHolderExpr

public DrillFuncHolderExpr(String nameUsed,
                           DrillFuncHolder holder,
                           List<LogicalExpression> args,
                           ExpressionPosition pos)

Method Detail

getMajorType

public TypeProtos.MajorType getMajorType()

Specified by:

getMajorType in interface LogicalExpression

Overrides:

getMajorType in class LogicalExpressionBase

iterator

public Iterator<LogicalExpression> iterator()

Specified by:

iterator in interface Iterable<LogicalExpression>

getHolder

public DrillFuncHolder getHolder()

Description copied from class: FunctionHolderExpression

Return the underlying function implementation holder. That is, returns the function declaration.

Specified by:

getHolder in class FunctionHolderExpression

isAggregating

public boolean isAggregating()

Specified by:

isAggregating in class FunctionHolderExpression

Returns:

aggregating function or not

isRandom

public boolean isRandom()

Description copied from class: FunctionHolderExpression

Is the function output non-deterministic?

Specified by:

isRandom in class FunctionHolderExpression

argConstantOnly

public boolean argConstantOnly(int i)

Description copied from class: FunctionHolderExpression

constant input expected for i'th argument?

Specified by:

argConstantOnly in class FunctionHolderExpression

Returns:

True if a constant input is expected for the i'th argument. False otherwise.

getSelfCost

public int getSelfCost()

Specified by:

getSelfCost in interface LogicalExpression

Overrides:

getSelfCost in class LogicalExpressionBase

getCumulativeCost

public int getCumulativeCost()

Specified by:

getCumulativeCost in interface LogicalExpression

Overrides:

getCumulativeCost in class LogicalExpressionBase

copy

public DrillFuncHolderExpr copy(List<LogicalExpression> args)

Specified by:

copy in class FunctionHolderExpression

Returns:

a copy of FunctionHolderExpression, with passed in argument list.

setInterpreter

public void setInterpreter(DrillSimpleFunc interpreter)

getInterpreter

public DrillSimpleFunc getInterpreter()