Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14355
@dongjoon-hyun Do you mind if I ask a question please?
It seems it works in MySQL supports `UNION ALL` for the compatible types,
for example, numeric compatible types. If my understanding is correct, it seems
it throws an exception when they are any combination of mismatched types.
Should this be maybe considered as well?
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