Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/13283#issuecomment-221770911
**Update**: The latest code changes contains
- For JDBC format, we added an extra checking in the rule
`ResolveRelations` of `Analyzer`. Without the PR, Spark will return the error
message like: `Option 'url' not specified`. Now, we are reporting `Unsupported
data source type for direct query on files: jdbc`
- Make data source format name case incensitive so that error handling
behaves consistent with the normal cases.
- Added the test cases for all the supported formats.
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