Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/13884#discussion_r68355194
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -1541,4 +1541,13 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
val df = Seq(1, 1, 2).toDF("column.with.dot")
checkAnswer(df.distinct(), Row(1) :: Row(2) :: Nil)
}
+
+ test("SPARK-16181: outer join with isNull filter") {
+ val left = Seq("x").toDF("col")
+ val right = Seq("y").toDF("col").withColumn("new", lit(true))
+ val joined = left.join(right, left("col") === right("col"),
"left_outer")
+
+ checkAnswer(joined, Row("x", null, null))
+ checkAnswer(joined.filter($"new".isNull), Row("x", null, null))
--- End diff --
ah, this is subtle. `new` is replaced back to the original `col` from
right, which is not nullable. Then, `isNull` just returns false.
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