Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14132
SQL generation is fragile and hard to maintain. This is a well-known issue
in Federation server. In Spark SQL, we are converting analyzed plans instead of
optimized plans. Thus, it is much simpler.
More fortunately, we are not converting partial plans. Thus, the cases we
have to consider are not many.
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