maropu commented on a change in pull request #27231: [SPARK-28478][SQL] Remove
redundant null checks
URL: https://github.com/apache/spark/pull/27231#discussion_r371563039
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
##########
@@ -434,6 +434,27 @@ 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 = {
+ val isNullIntolerant = ifNotNullExpr.find { x =>
+ !x.isInstanceOf[NullIntolerant] && x.find(e =>
e.semanticEquals(checkedExpr)).nonEmpty
Review comment:
The same logic?
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala#L105-L109
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