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Posted to issues@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2014/07/14 07:24:04 UTC
[jira] [Created] (TAJO-938) Schema should be allowed to have
multiple same column names.
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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