Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22702#discussion_r224950588 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala --- @@ -276,15 +276,31 @@ object BooleanSimplification extends Rule[LogicalPlan] with PredicateHelper { case a And b if a.semanticEquals(b) => a case a Or b if a.semanticEquals(b) => a - case a And (b Or c) if Not(a).semanticEquals(b) => And(a, c) - case a And (b Or c) if Not(a).semanticEquals(c) => And(a, b) - case (a Or b) And c if a.semanticEquals(Not(c)) => And(b, c) - case (a Or b) And c if b.semanticEquals(Not(c)) => And(a, c) - - case a Or (b And c) if Not(a).semanticEquals(b) => Or(a, c) - case a Or (b And c) if Not(a).semanticEquals(c) => Or(a, b) - case (a And b) Or c if a.semanticEquals(Not(c)) => Or(b, c) - case (a And b) Or c if b.semanticEquals(Not(c)) => Or(a, c) + // The following optimization is applicable only when the operands are nullable, --- End diff -- typo: `only when the operands are not nullable`
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