cloud-fan commented on code in PR #50570:
URL: https://github.com/apache/spark/pull/50570#discussion_r2041394407
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -671,9 +671,11 @@ object RemoveRedundantAliases extends Rule[LogicalPlan] {
val subQueryAttributes = if (conf.getConf(SQLConf
.EXCLUDE_SUBQUERY_EXP_REFS_FROM_REMOVE_REDUNDANT_ALIASES)) {
// Collect the references for all the subquery expressions in the
plan.
- AttributeSet.fromAttributeSets(plan.expressions.collect {
- case e: SubqueryExpression => e.references
- })
+ AttributeSet.fromAttributeSets(plan.expressions.flatMap(e => {
+ e.collect {
+ case e: SubqueryExpression => e.references
+ }
+ }))
Review Comment:
```suggestion
AttributeSet.fromAttributeSets(plan.expressions.flatMap { e =>
e.collect {
case e: SubqueryExpression => e.references
}
})
```
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