Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/18496
@felixcheung Yes. I think we can improve scala side. It only throws
exception when a `NULL` field is given. For unseen labels, as the example
above, it always fails at the same place `double` to `string`. The scala side
doesn't capture this exception and let it go into the handling logic to cause
the failure. I will try to address it in a follow-up PR.
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