Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/14580
@dongjoon-hyun, could you please try this on your PR?
````
val a = Seq((1,2),(2,3)).toDF("a","b").createOrReplaceTempView("A")
val b = Seq((2,5),(3,4)).toDF("a","c").createOrReplaceTempView("B")
sql("select A.A,B.A,A.B,B.C from A full join B on A.A=B.A").show
sql("select A.A,B.A from A full join B on A.A=B.A where coalesce(A.B,B.C)
is not null").show
````
How many rows do you get from the last and the second last statements?
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