Hyunsik Choi created TAJO-167:
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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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