Helper (Calcite Avatica 0.9.2-incubating API)

```
public class Helper
extends Object
```
Utility methods, mainly concerning error-handling.

Fields
Modifier and Type	Field and Description
`static Helper`	`INSTANCE`

Methods
Modifier and Type	Method and Description
`SQLException`	`createException(String message)`
`SQLException`	`createException(String message, Exception e)`
`RuntimeException`	`todo()`
`SQLException`	`toSQLException(SQLException exception)`
`RuntimeException`	`wrap(String message, Exception e)`

public RuntimeException wrap(String message,
                    Exception e)

public SQLException createException(String message,
                           Exception e)

public SQLException createException(String message)

public SQLException toSQLException(SQLException exception)

Class Helper