Github user uzadude commented on the issue:
https://github.com/apache/spark/pull/19683
looks like when the Optimizer is running, at some temporary point it makes
a copy of the Generate operator and fails on this cast. if we will move the
resolve check inside:
override lazy val resolved: Boolean = {
generator.resolved &&
childrenResolved &&
generator.elementSchema.length == generatorOutput.length &&
generatorOutput.forall(_.resolved) &&
unrequiredChildOutput.forall(_.resolved)
}
it works fine
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