Till Rohrmann created FLINK-2104:
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Summary: Fallback implicit values for PredictOperation and
TransformOperation don't work if Nothing is inferred as the output type
Key: FLINK-2104
URL: https://issues.apache.org/jira/browse/FLINK-2104
Project: Flink
Issue Type: Bug
Components: Machine Learning Library
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 0.9
If one calls a {{Predictor}} or {{Transformer}} with a wrong input type, then
the Scala compiler tries to apply the fallback implicit value for this
operation type. However, since the return type of the operations is
parameterized, it will infer it to be {{Nothing}}. The problem is then that the
implicit value {{Operation[Self, Input, Nothing]}} cannot be unified with the
implicit parameter {{Operation[Self, Input, Output]}}. This seems to be a known
Scala issue [https://issues.scala-lang.org/browse/SI-1570].
I propose to fix the output type of the implicit values to {{Any}} which will
avoid that {{Nothing}} is inferred. This should solve the problem.
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