Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/1118#issuecomment-46634501
For this PRD, if user want to describe a column, `DESCRIBE tableName
columnName` should be used (right now, the command to describe a column is
treated as a hive native command) because if this user uses `DESCRIBE
tableName.columnName`, `tableName` will be treated as the db name and
`columnName` will be treated as the table name. Need a follow-up jira to
address this issue.
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