codeBehindMe opened a new pull request #11976: URL: https://github.com/apache/beam/pull/11976
Previously, when a mismatch of the dimensions emitted by the DoFn and the
dimensions emitted by the ParDo was encountered, a less than helpful message of
`expected 1 output. Found: []` was returned. This caused some confusion
especially when paired with ParDo and ParDo0 which may be counterintuitive
arrangement to most.
In this patch, we provide a more helpful error message which correctly
reference the DoFn which has the misalignment and the ParDo which the
misalignment of dimensions were captured by. It also recommends a ParDo
function which may be used by the DoFn in question.
We introduce two new functions to the pardo package as well as a new
function to the reflectx package to help us construct this error message.
------------------------
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