Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12993#issuecomment-217777713
Agree. We need to be careful for deciding the design. This PR is just to
recover our previous behavior in `HiveContext`.
Regarding case sensitivity, it is complicated and platform/vender-specific.
Below is based on my search. It might not be 100% correct.
- For the un-quoted identifiers, the SQL2003 compliance and DB2 is No.
Oracle and SQL Server are configurable, but the default is No.
- For the quoted/delimited identifiers, most traditional RDBMS are case
sensitive. Hive is special. Starting from Hive 1.3, Hive supports quoted
identifiers in Column names. https://issues.apache.org/jira/browse/HIVE-6013
However, this is not applicable to the Table/Database names in Hive.
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