maropu commented on a change in pull request #32659:
URL: https://github.com/apache/spark/pull/32659#discussion_r647129296
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/EstimationUtils.scala
##########
@@ -80,6 +80,54 @@ object EstimationUtils {
expressions.collect {
case alias @ Alias(attr: Attribute, _) if attributeStats.contains(attr)
=>
alias.toAttribute -> attributeStats(attr)
+ case alias @ Alias(expn: Expression, _) if isExpressionStatsExist(expn,
attributeStats) =>
+ getExpressionStats(alias.toAttribute, expn, attributeStats)
+ }
+ }
+
+ // Support for substring expressions.
+ // TODO: Support for more expressions like Multiply.
Review comment:
Why do we need to handle individual exprs here? For aggregate stat
estimation, we cannot just use upper-bound stat values from a child plan in
`AggregateEstimation`?
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