HyukjinKwon commented on a change in pull request #21848:
URL: https://github.com/apache/spark/pull/21848#discussion_r549214987
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -390,6 +390,8 @@ object SimplifyConditionals extends Rule[LogicalPlan] with
PredicateHelper {
case If(TrueLiteral, trueValue, _) => trueValue
case If(FalseLiteral, _, falseValue) => falseValue
case If(Literal(null, _), _, falseValue) => falseValue
+ case If(cond, trueValue, falseValue)
+ if cond.deterministic && trueValue.semanticEquals(falseValue) =>
trueValue
Review comment:
Looks like we'll still have this problem by skipping the evaluation of
`cond` ..
Lately, SPARK-33544 introduced another approach for that. I think that
superseded SPARK-24913. I think we can switch it to use SPARK-33544 approach. I
will try a small fix for this.
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