Throwing exception from Python UDF

[michal-cech]

Hello,

how does Trino handle Python exceptions thrown from UDFs? My instance seems to hang for quite some time, after which I can see INTERNAL ERROR — FUNCTION_IMPLEMENTATION_ERROR. Is it possible to fail faster by throwing specific exception / killing the function prematurely? I suppose one way of doing it is by returning None or the message, but that feels wrong-ish, since it is not obvious on the first glance that the called function failed.

Thanks