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Posted to dev@calcite.apache.org by "KrishnaKant Agrawal (JIRA)" <ji...@apache.org> on 2018/12/28 08:25:00 UTC
[jira] [Created] (CALCITE-2757) DISTINCT not being handled
correctly in RelToSqlConverter
KrishnaKant Agrawal created CALCITE-2757:
--------------------------------------------
Summary: DISTINCT not being handled correctly in RelToSqlConverter
Key: CALCITE-2757
URL: https://issues.apache.org/jira/browse/CALCITE-2757
Project: Calcite
Issue Type: Bug
Components: core
Reporter: KrishnaKant Agrawal
Assignee: Julian Hyde
SELECT DISTINCT sum(x) OVER (PARTITION BY y) FROM t
is valid (per SQL standard) but
SELECT sum(x) OVER (PARTITION BY y)
FROM t
GROUP BY sum(x) OVER (PARTITION BY y)
is not. For example, given the query
select sum(deptno) over (partition by loc)
from dept
group by sum(deptno) over (partition by loc);
Oracle gives
ORA-00934: group function is not allowed here
Therefore we should generate a sub-query, something like this:
SELECT c1
FROM (
SELECT sum(deptno) OVER (PARTITION BY loc)
FROM dept) AS t
GROUP BY c1;
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