Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/13909
@cloud-fan Hmm, I agree that it's guaranteed by the source, but I thought
that's why we should use `containsNull` for `allowNull` to guarantee the value
will not be null when `containsNull == false` in this array for the caller of
this expression. ditto for `CreateMap`.
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