viirya commented on issue #21732: [SPARK-24762][SQL] Enable Option of Product encoders URL: https://github.com/apache/spark/pull/21732#issuecomment-450162483 Thanks for @cloud-fan's explanation. So I think @HyukjinKwon you mean why we interpret `Option[Product]` like `Some((1, "a")), Some((2, "b"))` as `Tuple2`. For the following ``` Seq(Some((1, "a")), Some((2, "b"))).toDF.show() Seq((1, "a"), (2, "b")).toDF.show() ``` can't produce the same result since top-level null row is not allowed in Spark.
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