[GitHub] [spark] maropu commented on a change in pull request #27008: [SPARK-30353][SQL] Add IsNotNull check in SimplifyBinaryComparison optimization

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maropu commented on a change in pull request #27008: [SPARK-30353][SQL] Add IsNotNull check in SimplifyBinaryComparison optimization
URL: https://github.com/apache/spark/pull/27008#discussion_r361782832
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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 @@ -384,22 +384,40 @@ object BooleanSimplification extends Rule[LogicalPlan] with PredicateHelper {
 /**
  * Simplifies binary comparisons with semantically-equal expressions:
  * 1) Replace '<=>' with 'true' literal.
- * 2) Replace '=', '<=', and '>=' with 'true' literal if both operands are non-nullable.
- * 3) Replace '<' and '>' with 'false' literal if both operands are non-nullable.
 
 Review comment:
   We need to update these statements above? IIUC this pr just checks more for non-nullable cases?

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