viirya commented on a change in pull request #29567:
URL: https://github.com/apache/spark/pull/29567#discussion_r479665954
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -463,6 +463,8 @@ object SimplifyConditionals extends Rule[LogicalPlan] with
PredicateHelper {
case If(Literal(null, _), _, falseValue) => falseValue
case If(cond, trueValue, falseValue)
if cond.deterministic && trueValue.semanticEquals(falseValue) =>
trueValue
+ case If(p, l @ Literal(null, _), FalseLiteral) if !p.nullable => And(p,
l)
+ case If(p, l @ Literal(null, _), TrueLiteral) if !p.nullable =>
Or(Not(p), l)
Review comment:
Hm, I think for expression rewriting, this won't be much faster. This is
like @HyukjinKwon said, should be a rare case. The most likely usage, I think,
is to turn a predicate to a form being able to push down to data source.
Adding a rule is too much. As part of existing rule looks more proper.
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