cloud-fan commented on issue #21732: [SPARK-24762][SQL] Enable Option of Product encoders URL: https://github.com/apache/spark/pull/21732#issuecomment-450161486 `Seq(Some(1), Some(2))` is treated same as `Seq(1, 2)`, because it's only a single column and we can make it nullable. So the `Some` here changes nothing but the column nullability. `Seq((1, "a"),(2, "b"))` is special, as dataset encoder assumes the top level `Product` will never be null, and flatten it into 2 columns. If we add `Some` here, we can't do the flattening.
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