Package org.apache.druid.math.expr

Class ApplyFunction.FoldLambdaBinding

java.lang.Object

org.apache.druid.math.expr.ApplyFunction.FoldLambdaBinding

All Implemented Interfaces:

ApplyFunction.IndexableFoldLambdaBinding, Expr.InputBindingInspector, Expr.ObjectBinding

Enclosing interface:

ApplyFunction

public static class ApplyFunction.FoldLambdaBinding
extends Object
implements ApplyFunction.IndexableFoldLambdaBinding

ApplyFunction.IndexableFoldLambdaBinding for a ApplyFunction.FoldFunction. Like ApplyFunction.MapLambdaBinding but with additional information to track and provide binding values for an accumulator.

Method Summary

Modifier and Type	Method	Description
ApplyFunction.FoldLambdaBinding	accumulateWithIndex(int index, Object acc)	Update the index and accumulator value
Object	get(String name)	Get value binding for string identifier of IdentifierExpr
ExpressionType	getAccumulatorType()
int	getLength()	Total number of bindings in this binding
ExpressionType	getType(String name)	Get the ExpressionType from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize

Method Detail

get

@Nullable
public Object get(String name)

Description copied from interface: Expr.ObjectBinding

Get value binding for string identifier of IdentifierExpr

Specified by:

get in interface Expr.ObjectBinding

getAccumulatorType

public ExpressionType getAccumulatorType()

Specified by:

getAccumulatorType in interface ApplyFunction.IndexableFoldLambdaBinding

getLength

public int getLength()

Description copied from interface: ApplyFunction.IndexableFoldLambdaBinding

Total number of bindings in this binding

Specified by:

getLength in interface ApplyFunction.IndexableFoldLambdaBinding

accumulateWithIndex

public ApplyFunction.FoldLambdaBinding accumulateWithIndex(int index,
                                                           Object acc)

Description copied from interface: ApplyFunction.IndexableFoldLambdaBinding

Update the index and accumulator value

Specified by:

accumulateWithIndex in interface ApplyFunction.IndexableFoldLambdaBinding

getType

@Nullable
public ExpressionType getType(String name)

Description copied from interface: Expr.InputBindingInspector

Get the ExpressionType from the backing store for a given identifier (this is likely a column, but could be other things depending on the backing adapter)

Specified by:

getType in interface Expr.InputBindingInspector