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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAJO-167) Implement GeneralSetFunctionExpr to represent with all SQL standard set functions.
Date Sun, 08 Sep 2013 05:25:52 GMT
Hyunsik Choi created TAJO-167:
---------------------------------

             Summary: Implement GeneralSetFunctionExpr to represent with 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


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 andg so on).

Also, GeneralSetFunctionExpr has an attribute for distinct keyword that set functions can
have.

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