robertwb opened a new pull request, #28289:
URL: https://github.com/apache/beam/pull/28289
It's not always possible to know if a transform consumes inputs, or can act
as a root transform (and in fact some may be able to do both depending on their
configuration), but when a transform expecting inputs doesn't get them the
error can be quite obscure. This adds best-effort checking and a better error
in that case.
We also allow explicitly setting empty imputs to work around this error
(which is where most of the complexity of this change lies). Importantly,
sources (no matter their name) are not required to have inputs.
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