org.apache.drill.exec.resolver

Class DefaultFunctionResolver

java.lang.Object

org.apache.drill.exec.resolver.DefaultFunctionResolver

All Implemented Interfaces:

FunctionResolver

public class DefaultFunctionResolver
extends Object
implements FunctionResolver

Constructor Summary

Constructors

Constructor and Description
DefaultFunctionResolver()

Method Summary

Modifier and Type	Method and Description
DrillFuncHolder	getBestMatch(List<DrillFuncHolder> methods, FunctionCall call) Creates a placeholder SqlFunction for an invocation of a function with a possibly qualified name.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultFunctionResolver

public DefaultFunctionResolver()

Method Detail

getBestMatch

public DrillFuncHolder getBestMatch(List<DrillFuncHolder> methods,
                                    FunctionCall call)

Description copied from interface: FunctionResolver

Creates a placeholder SqlFunction for an invocation of a function with a possibly qualified name. This name must be resolved into either a builtin function or a user-defined function.

Specified by:

getBestMatch in interface FunctionResolver

Parameters:

methods - a list of candidates of DrillFuncHolder to be chosen from

call - a given function call whose DrillFuncHolder is to be determined via this method

Returns:

DrillFuncHolder the chosen DrillFuncHolder