Zebra Column Group Access Control for A29 compliance and Performance

                 Key: PIG-987
                 URL: https://issues.apache.org/jira/browse/PIG-987
             Project: Pig
          Issue Type: New Feature
    Affects Versions: 0.6.0
            Reporter: Yan Zhou
            Assignee: Yan Zhou

Access Control: when processes try to read from the column groups, Zebra should 
be able to handle allowed vs. disallowed user/application accesses. 

Expected behavior when column group permissions are set:

    When user selects only columns that they do not have permissions to access, 
Zebra should return error with message "Error #: Permission denied for 
accessing column <column name or names> 

Access control applies to an entire column group, so all columns in a column 
group have same permissions. 

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