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From "Andrew McIntyre (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1624) use of direct column name rather than alias make aggregation fail (Hibernate depends on that)
Date Thu, 05 Oct 2006 06:20:21 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1624?page=comments#action_12440038 ] 
Andrew McIntyre commented on DERBY-1624:

Stumbled across this issue whilst searching for something else. Following Manish's query-rewriting
example, the original query:

        model0_.name as col_0_0_, 
        count(*) as col_1_0_ 
        Model model0_ 
    group by 
        count(*) > 1 

Could be rewritten as:

select * from 
            model0_.name as col_0_0_,
            count(*) as col_1_0_
            model model0_
        group by
    ) as
        model0_ (col_0_0_, col_1_0_) 
    where col_1_0_ > 1;

Unless I've missed something (which is likely, btw), I think this reproduces the desired results
with the current code. I realize this is hardly ideal, but it seems that all the necessary
pieces would be there: the table name, column names, and identical results to what (I think)
are expected.

One possible fix would be for the code that rewrites the group-by-with-having predicate as
a subquery to push the correlation names in the rewritten subquery out as correlation names
for the subquery. After looking at the code in sqlgrammar.jj, this would appear to be a non-trivial,
but doable, fix. A little further investigation revealed some discussion about a related issue
(DERBY-280) and there is already a JIRA filed for rethinking the parsers handling of queries
with GROUP BY/HAVING that is filed as DERBY-681.

> use of direct column name rather than alias make aggregation fail (Hibernate depends
on that)
> ---------------------------------------------------------------------------------------------
>                 Key: DERBY-1624
>                 URL: http://issues.apache.org/jira/browse/DERBY-1624
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions:,
>            Reporter: Emmanuel Bernard
> Error: org.apache.derby.client.am.SqlException: Column 'MODEL0_.COL_0_0_' is either not
in any table in the FROM list or appears within a join specification and is outside the scope
of the join specification or appears in a HAVING clause and is not in the GROUP BY list. If
this is a CREATE or ALTER TABLE  statement then 'MODEL0_.COL_0_0_' is not a column in the
target table., SQL State: 42X04, Error Code: -1
> for
> select
>         model0_.balance as col_0_0_,
>         count(*) as col_1_0_ 
>     from
>         account model0_ 
>     group by
>         model0_.balance 
>     having
>         count(*) > 1

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