Github user bdrillard commented on the issue:
https://github.com/apache/spark/pull/20085
@viirya I've found the same intent of a `ValueIfType` function can be
attained by adding a simpler `InstanceOf`
[expressions](https://github.com/apache/spark/pull/20085/files#diff-e436c96ea839dfe446837ab2a3531f93R265)
that can be used as the predicate to the existing `If` expression, and then
using `ObjectCast` on the results. That approach handles your [first
question](https://github.com/apache/spark/pull/20085#discussion_r158760292). To
your [second
question](https://github.com/apache/spark/pull/20085#discussion_r158760302), it
makes sense the input value expression should always have a DataType of
ObjectType. Is there a way you'd prefer to make that check? Or throw some kind
of exception of `value.dataType != ObjectType`?
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