org.apache.calcite.model

Class JsonFunction

java.lang.Object

org.apache.calcite.model.JsonFunction

public class JsonFunction
extends Object

Function schema element.

See Also:

Description of schema elements

Field Summary

Fields

Modifier and Type	Field and Description
String	className Name of the class that implements this function.
String	methodName Name of the method that implements this function.
String	name Name of this function.
List<String>	path Path for resolving this function.

Constructor Summary

Constructors

Constructor and Description
JsonFunction()

Method Summary

Modifier and Type	Method and Description
void	accept(ModelHandler handler)

Methods inherited from class java.lang.Object

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

Field Detail

name

public String name

Name of this function.

Required.

className

public String className

Name of the class that implements this function.

Required.

methodName

public String methodName

Name of the method that implements this function.

Optional.

If specified, the method must exist (case-sensitive) and Calcite will create a scalar function. The method may be static or non-static, but if non-static, the class must have a public constructor with no parameters.

If "*", Calcite creates a function for every method in this class.

If not specified, Calcite looks for a method called "eval", and if found, creates a a table macro or scalar function. It also looks for methods "init", "add", "merge", "result", and if found, creates an aggregate function.

path

public List<String> path

Path for resolving this function.

Optional.

Constructor Detail

JsonFunction

public JsonFunction()

Method Detail

accept

public void accept(ModelHandler handler)