Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18300#discussion_r122041541
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1764,6 +1764,68 @@ class Dataset[T] private[sql](
}
/**
+ * Returns a new Dataset containing union of rows in this Dataset and
another Dataset.
+ *
+ * To do a SQL-style set union (that does deduplication of elements),
use this function
--- End diff --
Also add a comment `This is different from both `UNION ALL` and `UNION
DISTINCT` in SQL. `
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