viirya commented on issue #21732: [SPARK-24762][SQL] Enable Option of Product encoders URL: https://github.com/apache/spark/pull/21732#issuecomment-450164376 @HyukjinKwon there was a comment https://github.com/apache/spark/pull/21732#issuecomment-403865941 for it. This was originally to make `Option[Product]` work for aggregators, but it makes encoder framework inconsistent because the created encoders can used for aggregators but not for Dataset. So I think the idea is to make it consistent. Users are allowed to encoder `Option[Product]` as Dataset but they should be aware of the encoding.
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