Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/23259
thanks @maropu for starting it!
> Which SQL standard does Spark SQL follow (e.g., 2011 or 2016)?
I think SQL 2011 is good, but if we can't find a public version, maybe it's
also OK to follow
[postgres](https://github.com/postgres/postgres/blob/ee2b37ae044f34851baba69e9ba737077326414e/src/backend/parser/gram.y#L15366)
> Where should we hanlde reserved key words?
I think it should be `SqlBase.g4`, but a problem is, the g4 files defines
`non-reserved` keywords, not `reserved` ones. Maybe we need to update it.
> Where should we docment the list of reserved/non-reserved key words?
I think the new files you created in this PR is a good place to document it
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