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_r369222353
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -442,6 +459,13 @@ object SimplifyConditionals extends Rule[LogicalPlan]
with PredicateHelper {
case If(cond, trueValue, falseValue)
if cond.deterministic && trueValue.semanticEquals(falseValue) =>
trueValue
+ case i @ If(cond, trueValue, falseValue) => cond match {
+ // If the null-check is redundant, remove it
+ case IsNull(child) if isRedundantNullCheck(trueValue, falseValue,
child) => falseValue
+ case IsNotNull(child) if isRedundantNullCheck(falseValue, trueValue,
child) => trueValue
+ case _ => i
+ }
Review comment:
Ok
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