hvanhovell commented on code in PR #48479:
URL: https://github.com/apache/spark/pull/48479#discussion_r1932298841
##########
connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/connect/ClientDataFrameStatSuite.scala:
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@@ -264,4 +264,13 @@ class ClientDataFrameStatSuite extends ConnectFunSuite
with RemoteSparkSession {
}
assert(error3.getCondition === "DATATYPE_MISMATCH.VALUE_OUT_OF_RANGE")
}
+
+ test("SPARK-49961: transform type should be consistent") {
+ val session = spark
+ import session.implicits._
+ val ds = Seq(1, 2).toDS()
+ val f: Dataset[Int] => Dataset[Int] = d => d.selectExpr("(value + 1)
value").as[Int]
+ val transformed = ds.transform(f)
+ assert(transformed.collect().sorted === Array(2, 3))
Review Comment:
This would normally fail with a ClassCastException right?
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