org.apache.druid.math.expr

Class ApplyFunction.LambdaInputBindingInspector

java.lang.Object

org.apache.druid.math.expr.ApplyFunction.LambdaInputBindingInspector

All Implemented Interfaces:

Expr.InputBindingInspector

Enclosing interface:

ApplyFunction

public static class ApplyFunction.LambdaInputBindingInspector
extends Object
implements Expr.InputBindingInspector

Helper that can wrap another Expr.InputBindingInspector to use to supply the type information of a LambdaExpr when evaluating ApplyFunctionExpr.getOutputType(org.apache.druid.math.expr.Expr.InputBindingInspector). Lambda identifiers do not exist in the underlying Expr.InputBindingInspector, but can be created by mapping the lambda identifiers to the arguments that will be applied to them, to map the type information.

Constructor Summary

Constructors

Constructor and Description
LambdaInputBindingInspector(Expr.InputBindingInspector inspector, org.apache.druid.math.expr.LambdaExpr expr, List<Expr> args)

Method Summary

Modifier and Type	Method and Description
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

Constructor Detail

LambdaInputBindingInspector

public LambdaInputBindingInspector(Expr.InputBindingInspector inspector,
                                   org.apache.druid.math.expr.LambdaExpr expr,
                                   List<Expr> args)

Method Detail

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