refactor DDL code (both DDLWork and DDLTask)
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                 Key: HIVE-123
                 URL: https://issues.apache.org/jira/browse/HIVE-123
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Namit Jain


It might be good to break DDLTask into separate tasks. The abstract class 
DDLWork can have various subclasses:
showTablesWork, DescribeTableWork etc. and a separate task for each of them. 
This will make them completely independent.


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