[GitHub] spark issue #16998: [SPARK-19665][SQL] Improve constraint propagation

[chriso <gi...@git.apache.org>]

Github user chriso commented on the issue:

    https://github.com/apache/spark/pull/16998
  
    I just run into the same issue with `spark-2.1.0`
    
    Here's a minimal test case:
    
    ```scala
    val max = 12 // try increasing this
    
    val filter = (for (i <- 0 to max) yield col("value") <=> i) reduce (_ || _)
    val projections = for (i <- 0 to max) yield (col("value") <=> i).as(s"value_$i")
    
    val otherFilter = lit(true) // this can be anything
    
    val df = Seq.empty[Int].toDF
    val result = df.filter(otherFilter)
      .select(col("value") +: projections: _*)
      .filter(filter).filter(otherFilter)
    
    result.explain
    ```
    
    The final `explain` call hangs [here](https://github.com/apache/spark/blob/db0ddce523bb823cba996e92ef36ceca31492d2c/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala#L325-L328).


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