zhengruifeng commented on code in PR #45412:
URL: https://github.com/apache/spark/pull/45412#discussion_r1515374917
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -3509,6 +3509,17 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val WRAP_EXISTS_IN_AGGREGATE_FUNCTION =
+ buildConf("spark.sql.optimizer.wrapExistsInAggregateFunction")
+ .internal()
+ .doc("When true, the optimizer will wrap newly introduced `exists`
attributes in an" +
+ "aggregate function to ensure that Aggregate nodes preserve semantic
invariant that each" +
+ "variable among agg expressions appears either in grouping expressions
or belongs to" +
Review Comment:
nit, missing spaces
```suggestion
.doc("When true, the optimizer will wrap newly introduced `exists`
attributes in an " +
"aggregate function to ensure that Aggregate nodes preserve semantic
invariant that each " +
"variable among agg expressions appears either in grouping expressions
or belongs to " +
```
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