dongjoon-hyun edited a comment on pull request #29771:
URL: https://github.com/apache/spark/pull/29771#issuecomment-694419724
Ur, @peter-toth . Could you check the PR description once more?
```scala
scala> spark.version
res1: String = 3.0.1
scala> :paste
// Entering paste mode (ctrl-D to finish)
val a = Seq("1").toDF("col1").withColumn("col2", lit("1"))
val b = Seq("2").toDF("col1").withColumn("col2", lit("2"))
val aub = a.union(b)
val c = aub.filter($"col1" === "2").cache()
val d = Seq("2").toDF( "col4")
val r = d.join(aub, $"col2" === $"col4").select("col4")
val l = c.select("col2")
val df = l.join(r, $"col2" === $"col4", "LeftOuter")
df.show()
// Exiting paste mode, now interpreting.
+----+----+
|col2|col4|
+----+----+
| 2| 2|
+----+----+
```
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