Github user koertkuipers commented on a diff in the pull request:
https://github.com/apache/spark/pull/15979#discussion_r90770855
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala
---
@@ -47,16 +47,26 @@ object ExpressionEncoder {
// We convert the not-serializable TypeTag into StructType and
ClassTag.
val mirror = typeTag[T].mirror
val tpe = typeTag[T].tpe
+
+ if (ScalaReflection.optionOfProductType(tpe)) {
+ throw new UnsupportedOperationException(
+ "Cannot create encoder for Option of Product type, because Product
type is represented " +
--- End diff --
this strikes me more as a limitation on Dataset[X] then on Encoder[X]
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