Github user maryannxue commented on the issue:
https://github.com/apache/spark/pull/22732
@srowen What @cloud-fan described is a change introduced in #22259. We can
fix it by keeping each call to `ScalaReflection.schemaFor` in their own `Try`
blocks.
As to `UserDefinedFunction`, after offline discussions with @cloud-fan, we
decided that there should be no occurrences of calling the constructor without
setting the `nullableTypes`, so we'll just assert `nullableTypes.length ==
exprs.length`.
I'll go ahead and fix these two items and update the PR.
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