Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/16572
Note the way the plans inside subqueries are not treated as part of the
tree traversal is a common problem. Besides this problem, another was reported
in SPARK-19093. Also the way Spark needs to implement a nested call to the
Optimizer via the rule `OptimizedSubqueries` to work on those plans is another
instance.
One possible solution is to overwrite the tree traversal (`transformUp`,
`transformDown`) of class `LogicalPlan` to include those subqueries' plans.
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