Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12618#issuecomment-214100950
@hvanhovell @yhuai I hit and address a related issue.
Running SQL on files directly could break the rules. For example,
```SQL
select id from `org.apache.spark.sql.parquet`.`path/to/parquet/files` as p
```
This was resolved by an `Analyzer` rule: `ResolveDataSource`. Thus, it
should not exist after finishing `Analyzer`. Thus, it is ok to keep enforcing
the existing naming rule, if we do not validate the names in `databaseExists`
and `tableExists`.
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