Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18416#discussion_r125636427
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -342,6 +342,28 @@ object ScalaReflection extends ScalaReflection {
mirror.runtimeClass(t.typeSymbol.asClass)
)
+ // We serialize a `Set` to Catalyst array. When we deserialize a
Catalyst array
+ // to a `Set`, if there are duplicated elements, the elements will
be de-duplicated.
+ case t if t <:< localTypeOf[scala.collection.Set[_]] =>
--- End diff --
I think we only need to update one place:
```
val companion = t.normalize.typeSymbol.companionSymbol.typeSignature
val cls = companion.declaration(newTermName("newBuilder")) match {
case NoSymbol if t <:< localTypeOf[Seq[_]] => classOf[Seq[_]]
case NoSymbol if t <:< localTypeOf[scala.collection.Set[_]] =>
classOf[Set[_]]
case _ => mirror.runtimeClass(t.typeSymbol.asClass)
}
```
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