Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18416#discussion_r125556076
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -498,6 +520,19 @@ object ScalaReflection extends ScalaReflection {
serializerFor(_, valueType, valuePath, seenTypeSet),
valueNullable = !valueType.typeSymbol.asClass.isPrimitive)
+ case t if t <:< localTypeOf[scala.collection.Set[_]] =>
+ val TypeRef(_, _, Seq(elementType)) = t
+
+ // There's no corresponding Catalyst type for `Set`, we serialize
a `Set` to Catalyst array.
+ // Note that the property of `Set` is only kept when manipulating
the data as domain object.
+ val newInput =
+ Invoke(
+ inputObject,
+ "toSeq",
+ ObjectType(classOf[Seq[_]]))
--- End diff --
For primitive, calling `toArray` can directly construct `UnsafeArrayData`
in `toCatalystArray`. However, `toArray` requires a `ClassTag`. To generate it
with a `StaticInvoke` might be hacky. So for now I simply use `toSeq`.
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