Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11190#issuecomment-183615182
@rxin Compare to broadcast join, we do execution in prepare(), for
uncorrelated scalar subquery, we do optimize and execution in prepare(), I
think it's not a big deal. For all other subqueries, they will be rewritten as
join, will not be executed in prepare(), only current one is the except.
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