| Class | Description | 
|---|---|
| MonitoredUDFExecutor | 
 MonitoredUDF is used to watch execution of a UDF, and kill it if the UDF takes an
 exceedingly long time. 
 | 
| MonitoredUDFExecutor.ErrorCallback | 
 UDF authors can optionally extend this class and provide the class of their custom callbacks in the annotation
 to perform their own handling of errors and timeouts. 
 | 
| PlanHelper | 
 Utility class with a few helper functions to deal with physical plans. 
 | 
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