Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15272#discussion_r81130353
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -88,7 +88,7 @@ trait PredicateHelper {
* `false`.
*/
protected def canEvaluate(expr: Expression, plan: LogicalPlan): Boolean =
- expr.references.subsetOf(plan.outputSet)
+ !expr.references.isEmpty && expr.references.subsetOf(plan.outputSet)
--- End diff --
This does fix the problem with minimal code changes, but it doesn't match
the semantic, as literals CAN be evaluated on any plan.
how about we fix `ExtractEquiJoinKeys` instead?
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