Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14111
I have a simpler idea to implement this feature:
1. in `SparkPlan`, build a map from distinct subqueries to future result,
and still keep the original subquery list.
2. in `SparkPlan.prepareSubqueries`, iterate the map and execute these
distinct subqueries.
3. in `SparkPlan.waitForSubqueries`, iterate the original subquery list,
get the result by searching the map, and then call `updateResult`.
I think this approach need much less code change, what do you think?
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