ScalarUdf (samza-api 1.5.0 API)

```
public interface ScalarUdf
```
The base class for the Scalar UDFs. All the scalar UDF classes needs to extend this. The number and type of arguments for the method annotated with SamzaSqlUdfMethod in the UDF class should match the number and type of fields used while invoking this UDF in SQL statement. Say for e.g. User creates a UDF class with signature int execute(int var1, String var2). It can be used in a SQL query select myudf(id, name) from profile In the above query, Profile should contain fields named 'id' of INTEGER/NUMBER type and 'name' of type VARCHAR/CHARACTER

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`init(Config udfConfig, Context context)` Udfs can implement this method to perform any initialization that they may need.

Interface ScalarUdf