kennknowles commented on issue #18705:
URL: https://github.com/apache/beam/issues/18705#issuecomment-1216968539

   I don't know of anyone planning on implementing this. I would recommend 
simply not using `BeamSetOperatorRelBase` at all and directly implementing the 
UNION ALL rel. I do not recall which Calcite class that is. But the sharing of 
the operator base needlessly complicates and restricts the implementation. Just 
go ahead and directly implement the rel as a PTransform.


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