[jira] [Created] (TAJO-938) Schema should be allowed to have multiple same column names.

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-938:
---------------------------------

             Summary: Schema should be allowed to have multiple same column 
names.
                 Key: TAJO-938
                 URL: https://issues.apache.org/jira/browse/TAJO-938
             Project: Tajo
          Issue Type: Bug
          Components: catalog, planner/optimizer
            Reporter: Hyunsik Choi
             Fix For: 0.9.0


Currently, a schema has been an ordered set of unique column names. It is true 
only if a tuple bag is materialized as a table. In runtime, a tuple bag can 
have the multiple same columns. Of course, they are definitely not good 
convention, but some real applications in practice use the following sql 
statements:

{code}
select l_orderkey, (-l_orderkey) as l_orderkey from lineitem ;
{code}



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