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From "Daniel Lee (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-312) derby fails with duplicate primary key(s) in group by list
Date Fri, 10 Aug 2007 01:43:42 GMT
derby fails with duplicate primary key(s) in group by list
----------------------------------------------------------

                 Key: OPENJPA-312
                 URL: https://issues.apache.org/jira/browse/OPENJPA-312
             Project: OpenJPA
          Issue Type: Bug
          Components: sql
    Affects Versions: 1.0.0
            Reporter: Daniel Lee
            Priority: Minor
             Fix For: 1.0.0


derby fails with duplicate primary key(s) in group by list

With query "select o.customer, avg(o.amount) from Order o group by o.customer" the push-down
query contains duplicate columns in the group by clause.  This is okay when DB2 and other
DB that tolerate the duplicates but Derby returns error.

Of course, we can ask fix on Derby but we can also easy fix in OpenJPA to avoid duplicates
in the group by list.  Please refer to the following for the error result and the attach patch
for the fix.

Output from running the query that generate duplicate in the group by list:
6429  demo  TRACE  [main] openjpa.Query - Executing query: select o.customer, avg(o.amount)
from Order o group by o.customer
6639  demo  TRACE  [main] openjpa.jdbc.SQL - <t 1094861122, conn 1639735740> executing
prepstmnt 1405375428 SELECT t1.countryCode, t1.id, t1.version, t1.city, t1.state, t1.street,
t1.zip, t1.creditRating, t1.name, AVG(t0.amount) FROM Order t0 INNER JOIN Customer t1 ON t0.customer_countryCode
= t1.countryCode AND t0.customer_id = t1.id GROUP BY t1.countryCode, t1.id, t1.version, t1.countryCode,
t1.id, t1.city, t1.state, t1.street, t1.zip, t1.countryCode, t1.id, t1.creditRating, t1.name




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