youngoli commented on issue #11257: [BEAM-3301] Create runtime invokers for SDF 
methods.
URL: https://github.com/apache/beam/pull/11257#issuecomment-605409185
 
 
   CC: @lostluck 
   
   Like I mentioned in the commit message above, this is lacking runtime 
optimizations. I got the testing working and wanted to get this in a PR so you 
can give some general feedback so I can know if I'm on the right track. But 
as-is, the change isn't done yet.
   
   My current plan for optimization is to follow the regular invoker's example 
and make this a method we can call in Setup, have it output a CallFn, and then 
we can use that in ProcessElement to actually invoke the method, without the 
extra boilerplate that doesn't need to be done per-element. I avoided all that 
for the first go-round because I didn't understand why it was being done that 
way, and I just wanted the simplest implementation possible to get it working.

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