org.apache.druid.math.expr

Class ApplyFunction.BaseFoldFunction

java.lang.Object

org.apache.druid.math.expr.ApplyFunction.BaseFoldFunction

All Implemented Interfaces:

ApplyFunction, NamedFunction

Direct Known Subclasses:

ApplyFunction.CartesianFoldFunction, ApplyFunction.FoldFunction

Enclosing interface:

ApplyFunction

public abstract static class ApplyFunction.BaseFoldFunction
extends Object
implements ApplyFunction

Base class for family of ApplyFunction which aggregate a scalar or array value given one or more array input Expr arguments and an array or scalar "accumulator" argument with an initial value

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.druid.math.expr.ApplyFunction

ApplyFunction.AllMatchFunction, ApplyFunction.AnyMatchFunction, ApplyFunction.BaseFoldFunction, ApplyFunction.BaseMapFunction, ApplyFunction.CartesianFoldFunction, ApplyFunction.CartesianFoldLambdaBinding, ApplyFunction.CartesianMapFunction, ApplyFunction.CartesianMapLambdaBinding, ApplyFunction.FilterFunction, ApplyFunction.FoldFunction, ApplyFunction.FoldLambdaBinding, ApplyFunction.IndexableFoldLambdaBinding, ApplyFunction.IndexableMapLambdaObjectBinding, ApplyFunction.LambdaInputBindingInspector, ApplyFunction.MapFunction, ApplyFunction.MapLambdaBinding, ApplyFunction.MatchFunction, ApplyFunction.SettableLambdaBinding

Constructor Summary

Constructors

Constructor and Description
BaseFoldFunction()

Method Summary

Modifier and Type	Method and Description
ExpressionType	getOutputType(Expr.InputBindingInspector inspector, org.apache.druid.math.expr.LambdaExpr expr, List<Expr> args) Compute the output type of this function for a given lambda and the argument expressions which will be applied as its inputs.
boolean	hasArrayOutput(org.apache.druid.math.expr.LambdaExpr lambdaExpr) Returns true if apply function produces an array output.

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.ApplyFunction

apply, asVectorProcessor, canVectorize, getArrayInputs, validateArguments

Methods inherited from interface org.apache.druid.math.expr.NamedFunction

name, processingFailed, validationFailed, validationFailed, validationHelperCheckAnyOfArgumentCount, validationHelperCheckArgIsLiteral, validationHelperCheckArgumentCount, validationHelperCheckArgumentCount, validationHelperCheckArgumentRange, validationHelperCheckLambaArgumentCount, validationHelperCheckMinArgumentCount, validationHelperCheckMinArgumentCount

Constructor Detail

BaseFoldFunction

public BaseFoldFunction()

Method Detail

hasArrayOutput

public boolean hasArrayOutput(org.apache.druid.math.expr.LambdaExpr lambdaExpr)

Description copied from interface: ApplyFunction

Returns true if apply function produces an array output. All ApplyFunction implementations are expected to exclusively produce either scalar or array values.

Specified by:

hasArrayOutput in interface ApplyFunction

getOutputType

@Nullable
public ExpressionType getOutputType(Expr.InputBindingInspector inspector,
                                              org.apache.druid.math.expr.LambdaExpr expr,
                                              List<Expr> args)

Description copied from interface: ApplyFunction

Compute the output type of this function for a given lambda and the argument expressions which will be applied as its inputs.

Specified by:

getOutputType in interface ApplyFunction

See Also:

Expr.getOutputType(org.apache.druid.math.expr.Expr.InputBindingInspector)