Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21752#discussion_r204885925
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala ---
@@ -717,4 +717,9 @@ class DataFrameAggregateSuite extends QueryTest with
SharedSQLContext {
Row(1, 2, 1) :: Row(2, 2, 2) :: Row(3, 2, 3) :: Nil)
}
+ test("SPARK-24788: toString with unresolved expressions should not
throw") {
+ // these should not raise exceptions
+ testData.groupBy('key).toString
+ testData.groupBy(col("key")).toString
--- End diff --
add assert to compare the results.
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