Github user scwf commented on a diff in the pull request:
https://github.com/apache/spark/pull/4091#discussion_r23217520
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -360,19 +361,20 @@ object BooleanSimplification extends
Rule[LogicalPlan] with PredicateHelper {
val lhsSet = splitConjunctivePredicates(left).toSet
val rhsSet = splitConjunctivePredicates(right).toSet
val common = lhsSet.intersect(rhsSet)
- val ldiff = lhsSet.diff(common)
- val rdiff = rhsSet.diff(common)
- if ( ldiff.size == 0 || rdiff.size == 0) {
- // a || (b && a) => a
- common.reduce(And)
+ if (common.isEmpty) {
--- End diff --
the same, we can remove it
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