Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18645
The json4s change above made this change notably simpler. The current
problem is the same, next error:
```
sbt.ForkMain$ForkError: java.lang.ClassCastException: java.lang.Integer
cannot be cast to org.apache.spark.sql.UDT$MyDenseVector
at
org.apache.spark.sql.UserDefinedTypeSuite$$anonfun$10.apply(UserDefinedTypeSuite.scala:211)
at
org.apache.spark.sql.UserDefinedTypeSuite$$anonfun$10.apply(UserDefinedTypeSuite.scala:205)
at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
at org.scalatest.Transformer.apply(Transformer.scala:22)
at org.scalatest.Transformer.apply(Transformer.scala:20)
at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186)
at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:68)
at
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:183)
at
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
at
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
at org.scalatest.SuperEngine.runTestImpl(Engine.scala:289)
at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:196)
at
org.apache.spark.sql.UserDefinedTypeSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(UserDefinedTypeSuite.scala:146)
at
org.scalatest.BeforeAndAfterEach$class.runTest(BeforeAndAfterEach.scala:221)
at
org.apache.spark.sql.UserDefinedTypeSuite.runTest(UserDefinedTypeSuite.scala:146)
```
See comments on that test:
https://github.com/apache/spark/commit/3ae25f244bd471ef77002c703f2cc7ed6b524f11#commitcomment-23320234
https://github.com/apache/spark/commit/3ae25f244bd471ef77002c703f2cc7ed6b524f11#commitcomment-23341672
I'm current looking into Michael's suggestion in the second case.
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