Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18732#discussion_r143614190
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -435,6 +435,35 @@ class RelationalGroupedDataset protected[sql](
df.logicalPlan.output,
df.logicalPlan))
}
+
+ /**
+ * Applies a vectorized python use-defined function to each group of
data.
--- End diff --
nit: `use-defined` -> `user-defined`
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