cloud-fan commented on code in PR #49518:
URL: https://github.com/apache/spark/pull/49518#discussion_r1917528400
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala:
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@@ -1042,6 +1043,75 @@ trait CheckAnalysis extends PredicateHelper with
LookupCatalog with QueryErrorsB
if (Utils.isTesting) scrubOutIds(result) else result
}
+ /**
+ * Recursion, according to SQL standard, comes with several limitations:
+ * 1. Recursive term can contain one recursive reference only.
+ * 2. Recursive reference can't be used in some kinds of joins and
aggregations.
Review Comment:
how about subquery expressions? Can they contain recursive references? e.g.
```
WITH RECURSION t (
SELECT 1
UNION ALL
SELECT (SELECT max(col) FROM t)
)
```
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