davidvrba commented on a change in pull request #27231: [SPARK-28478][SQL] Remove redundant null checks URL: https://github.com/apache/spark/pull/27231#discussion_r368393513
########## File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala ########## @@ -434,6 +434,22 @@ object SimplifyConditionals extends Rule[LogicalPlan] with PredicateHelper { case _ => false } + /** + * Condition for redundant null check based on intolerant expressions. + * @param ifNullExpr expression that takes place if checkedExpr is null + * @param ifNotNullExpr expression that takes place if checkedExpr is not null + * @param checkedExpr expression that is checked for null value + */ + private def isRedundantNullCheck( + ifNullExpr: Expression, + ifNotNullExpr: Expression, + checkedExpr: Expression): Boolean = ifNotNullExpr match { + case e: NullIntolerant if ( + (ifNullExpr == checkedExpr || ifNullExpr == Literal.create(null, checkedExpr.dataType)) + && e.children.contains(checkedExpr)) => true + case _ => false + } Review comment: Makes sense. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org