viirya commented on a change in pull request #30245:
URL: https://github.com/apache/spark/pull/30245#discussion_r518419317
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala
##########
@@ -96,8 +131,21 @@ class EquivalentExpressions {
case other => other.children
}
- if (!skip && !addExpr(expr)) {
- childrenToRecurse.foreach(addExprTree)
+ // For some special expressions we cannot just recurse into all of its
children, but we can
+ // recursively add the common expressions shared between all of its
children.
+ def commonChildrenToRecurse: Seq[Seq[Expression]] = expr match {
Review comment:
Ok.
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