Github user icexelloss commented on a diff in the pull request:
https://github.com/apache/spark/pull/19872#discussion_r158952743
--- Diff: python/pyspark/sql/tests.py ---
@@ -477,6 +502,7 @@ def test_udf_with_aggregate_function(self):
sel = df.groupBy(my_copy(col("key")).alias("k"))\
.agg(sum(my_strlen(col("value"))).alias("s"))\
.select(my_add(col("k"), col("s")).alias("t"))
+ self.printPlans(sel)
--- End diff --
Oh that's great. Thanks!
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