cloud-fan commented on issue #24759: [SPARK-27395][SQL][WIP] Improve EXPLAIN command URL: https://github.com/apache/spark/pull/24759#issuecomment-521895096 I'm OK to stay with the `TreeNode` string methods for now, but I do think we should refactor it to a visitor pattern in the future. It's more flexible and maintainable. We can put the related code in one place instead of spreading it to many places. BTW I have a concern about subqueries. How do we handle nested subqueries? It looks like the current format will flatten the nested subqueries, and put them all together in the `subqueries` section.
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