Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/19993
To make it available for other classes, we need to support checking for
both `fit` and `transform`, that means we also need a sample input Dataset, so
we may have to add the explicit test in each of the test suite. But we can
still create some infrastructure function for the explicit test to invoke.
E.g. we can create some function in object ParamsSuite or other places
`checkMultiColumnParams(obj: Params, sampleData: Dataset[_])`
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