Github user xinxin-stripe commented on the issue: https://github.com/apache/spark/pull/21320 Hello, we've been using your patch at Stripe and we've found something that looks like a new correctness issue: ``` import spark.implicits._ case class Inner(a: String) case class Outer(key: String, inner: Inner) val obj = Outer("key", Inner("a")) val ds = spark.createDataset(Seq(obj)) .groupByKey(_.key) .reduceGroups((struct1, struct2) => struct1) .map(_._2) ds.collect.head shouldBe obj // This fails with java.lang.RuntimeException: Couldn't find inner#38 in [key#37,value#41,a#61] ```
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