Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/5700#discussion_r39257887
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -413,6 +418,10 @@ object BooleanSimplification extends Rule[LogicalPlan]
with PredicateHelper {
case LessThan(l, r) => GreaterThanOrEqual(l, r)
// not(l <= r) => l > r
case LessThanOrEqual(l, r) => GreaterThan(l, r)
+ // not(l || r) => not(l) && not(r)
+ case Or(l, r) => And(Not(l), Not(r))
+ // not(l && r) => not(l) or not(r)
+ case And(l, r) => Or(Not(l), Not(r))
--- End diff --
At first I thought this optimization should be only used in datasource as
it may cause performance regression for normal cases(see these
[comments](https://github.com/apache/spark/pull/8200#discussion-diff-37154582)).
However after an offline discussion with @marmbrus , this optimization is
pretty standard and generally good, so let's keep it in `Optimizer` :)
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