Affects Version/s: None
Fix Version/s: 0.13.0
GenericUDF class is the latest and recommended base class for any UDFs.
This JIRA is to change the current UDFDate* classes extended from GenericUDF.
The general benefit of GenericUDF is described in comments as
"* The GenericUDF are superior to normal UDFs in the following ways: 1. It can
accept arguments of complex types, and return complex types. 2. It can accept
variable length of arguments. 3. It can accept an infinite number of function
signature - for example, it's easy to write a GenericUDF that accepts
array<int>, array<array<int>> and so on (arbitrary levels of nesting). 4. It
can do short-circuit evaluations using DeferedObject."