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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TAJO-167) Implement GeneralSetFunctionExpr to represent all SQL standard set functions.
Date Sun, 08 Sep 2013 05:30:51 GMT

     [ https://issues.apache.org/jira/browse/TAJO-167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hyunsik Choi updated TAJO-167:
------------------------------

    Summary: Implement GeneralSetFunctionExpr to represent all SQL standard set functions.
 (was: Implement GeneralSetFunctionExpr to represent with all SQL standard set functions.)
    
> Implement GeneralSetFunctionExpr to represent all SQL standard set functions.
> -----------------------------------------------------------------------------
>
>                 Key: TAJO-167
>                 URL: https://issues.apache.org/jira/browse/TAJO-167
>             Project: Tajo
>          Issue Type: Improvement
>          Components: planner/optimizer
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.2-incubating
>
>         Attachments: TAJO-167.patch
>
>
> This patch removes CountValueFunctionExpr and add GeneralSetFunctionExpr corresponding
to general_set_function of SQL 2003 BNF (http://savage.net.au/SQL/sql-2003-2.bnf.html#general
set function).
> After this patch, we should use GeneralSetFunctionExpr to represent all SQL standard
aggregation functions (e.g., max, min, avg, sum, stddev_pop, stddev_samp and so on).
> Also, GeneralSetFunctionExpr has an attribute for distinct keyword that set functions
can have.

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