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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