Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/10630#discussion_r49047907
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -329,6 +329,14 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
Row(3, "c") ::
Row(4, "d") :: Nil)
checkAnswer(lowerCaseData.intersect(upperCaseData), Nil)
+
+ // check null equality
--- End diff --
A good case might be two tables that each contain two int rows [1], [1] and
intersect them.
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