mickjermsurawong-stripe commented on a change in pull request #25736:
[SPARK-29026][SQL] Improve error message in `schemaFor` in trait without
companion object constructor
URL: https://github.com/apache/spark/pull/25736#discussion_r322544479
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
##########
@@ -906,7 +906,19 @@ trait ScalaReflection extends Logging {
* only defines a constructor via `apply` method.
*/
private def getCompanionConstructor(tpe: Type): Symbol = {
-
tpe.typeSymbol.asClass.companion.asTerm.typeSignature.member(universe.TermName("apply"))
+ def throwUnsupportedOperation = {
+ throw new UnsupportedOperationException(s"Unable to find constructor for
$tpe. " +
+ s"This could happen if $tpe is an interface, or a trait without
companion object " +
+ "constructor.")
+ }
+ val companionSym = tpe.typeSymbol.asClass.companion match {
+ case NoSymbol => throwUnsupportedOperation
+ case sym => sym
+ }
Review comment:
Updated to nested patter match, but retained the inner method to throw
exception
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