Common-SS: changed UDFFinder from interface to abstract class

[Andreas Beeker <ki...@apache.org>]

Hi,

the UDFFinder interface had a constant (DEFAULT) to one of its subclasses.

I've changed the interface now to an abstract class - this will certainly break other implementations,
but the fix to switch from "implements" to "extends" seems better compared to a strange
self-reference.

I hope this is ok for you, otherwise now would be a good time to revert it.

Andi


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