Andrew Haselgrove created BEAM-12960:
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Summary: Error unclear for structural DoFn
Key: BEAM-12960
URL: https://issues.apache.org/jira/browse/BEAM-12960
Project: Beam
Issue Type: Bug
Components: beam-model
Reporter: Andrew Haselgrove
I recently received the following error for my structural DoFn: "failed to find
ProcessElement method". However, I had implemented ProcessElement - the error
was that I failed to take the address of the DoFn struct as the parameter for
the ParDo.
I think this error could be much clearer. Taking a look at the implementation,
I see that it somewhat is:
[https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/graph/fn.go#L154.]
However, this error message doesn't match the implementation, which also
accepts the struct as-is. I assume the struct is accepted here for other uses
of `NewFn` (eg. `RegisterFunction`), as from my example above, for the `ParDo`
case, this just goes on to surface a less-clear error deeper in the call chain.
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