Package org.apache.druid.math.expr
Class ApplyFunction.MapFunction
- java.lang.Object
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- org.apache.druid.math.expr.ApplyFunction.BaseMapFunction
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- org.apache.druid.math.expr.ApplyFunction.MapFunction
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- All Implemented Interfaces:
ApplyFunction
,NamedFunction
- Enclosing interface:
- ApplyFunction
public static class ApplyFunction.MapFunction extends ApplyFunction.BaseMapFunction
Map the scalar values of a single array inputExpr
to a single argumentLambdaExpr
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Nested Class Summary
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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
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Constructor Summary
Constructors Constructor Description MapFunction()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ExprEval
apply(org.apache.druid.math.expr.LambdaExpr lambdaExpr, List<Expr> argsExpr, Expr.ObjectBinding bindings)
Set<Expr>
getArrayInputs(List<Expr> args)
Get list of input arguments which must evaluate to an arrayExprType
String
name()
Name of the functionvoid
validateArguments(org.apache.druid.math.expr.LambdaExpr lambdaExpr, List<Expr> args)
Validate function arguments.-
Methods inherited from class org.apache.druid.math.expr.ApplyFunction.BaseMapFunction
getOutputType, hasArrayOutput
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.druid.math.expr.ApplyFunction
asVectorProcessor, canVectorize
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Methods inherited from interface org.apache.druid.math.expr.NamedFunction
processingFailed, validationFailed, validationFailed, validationHelperCheckAnyOfArgumentCount, validationHelperCheckArgIsLiteral, validationHelperCheckArgumentCount, validationHelperCheckArgumentCount, validationHelperCheckArgumentRange, validationHelperCheckLambaArgumentCount, validationHelperCheckMinArgumentCount, validationHelperCheckMinArgumentCount
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Method Detail
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name
public String name()
Description copied from interface:NamedFunction
Name of the function
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apply
public ExprEval apply(org.apache.druid.math.expr.LambdaExpr lambdaExpr, List<Expr> argsExpr, Expr.ObjectBinding bindings)
Description copied from interface:ApplyFunction
ApplyLambdaExpr
to argument list ofExpr
given a set of outerExpr.ObjectBinding
. These outer bindings will be used to form the scope for the bindings used to evaluate theLambdaExpr
, which use the array inputs to supply scalar values to use as bindings forIdentifierExpr
in the lambda body.
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getArrayInputs
public Set<Expr> getArrayInputs(List<Expr> args)
Description copied from interface:ApplyFunction
Get list of input arguments which must evaluate to an arrayExprType
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validateArguments
public void validateArguments(org.apache.druid.math.expr.LambdaExpr lambdaExpr, List<Expr> args)
Description copied from interface:ApplyFunction
Validate function arguments. This method is called whenever aApplyFunctionExpr
is created, and should validate everything that is feasible up front. Note that input type information is typically unavailable at the timeExpr
are parsed, and so this method is incapable of performing complete validation.
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