cloud-fan commented on code in PR #36588:
URL: https://github.com/apache/spark/pull/36588#discussion_r958046356
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala:
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@@ -140,6 +140,15 @@ trait PredicateHelper extends AliasHelper with Logging {
findExpressionAndTrackLineageDown(replaceAlias(exp, aliasMap), a.child)
case l: LeafNode if exp.references.subsetOf(l.outputSet) =>
Some((exp, l))
+ case u: Union =>
+ val index = u.output.indexWhere(_.semanticEquals(exp))
+ if (index > -1) {
+ u.children
+ .flatMap(child =>
findExpressionAndTrackLineageDown(child.output(index), child))
+ .sortBy(_._2.stats.sizeInBytes).lastOption
Review Comment:
can you explain a bit more about this sorting part?
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