[GitHub] [spark] dongjoon-hyun edited a comment on pull request #29771: [SPARK-32635][SQL] Fix foldable propagation

[GitBox <gi...@apache.org>]

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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