Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/14580 Sorry, my above description is not clear. `isnotnull(coalesce(b#227, c#238))` does not filter out `NULL` of `b#227` and `c#238`. Only when both are `b#227` and `c#238` are `NULL`, `coalesce(b#227, c#238)` returns `NULL`. Thus, we are unable to use the following two statements to conclude whether left or right has Non-Null predicates. ```Scala filter.constraints.filter(_.isInstanceOf[IsNotNull]) .exists(expr => join.left.outputSet.intersect(expr.references).nonEmpty) ``` and ```Scala filter.constraints.filter(_.isInstanceOf[IsNotNull]) .exists(expr => join.right.outputSet.intersect(expr.references).nonEmpty ```
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