Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14132
In the JIRA https://issues.apache.org/jira/browse/SPARK-11012, we
documented the current limitation of SQL generation:
>Note that not all resolved logical query plan can be converted back to SQL
query string. Either because it consists of some language structure that has
not been supported yet, or it doesn't have a SQL representation inherently
(e.g. query plans built on top of local Scala collections).
The purpose of SQL generation is for better native view support. The target
logical plan must be parsed from a valid HiveQL query statement. Thus, the two
examples you mentioned above are not supported.
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