Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14452
@gatorsmile Your second query example have two different CTE subqueries.
And no one is reused in the query plan. So we will not see CommonSubquery. The
optimized plan of this query looks like:
Join Inner
:- LocalRelation [a#226, b#227]
+- Join Inner
:- LocalRelation [a#1509, b#1510]
+- LocalRelation [a#1507, b#1508]
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