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From "Nikita Timofeev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CAY-2356) EJBQL: Incorrect COUNT() on outer joined table
Date Tue, 29 Aug 2017 07:33:00 GMT
Nikita Timofeev created CAY-2356:
------------------------------------

             Summary: EJBQL: Incorrect COUNT() on outer joined table 
                 Key: CAY-2356
                 URL: https://issues.apache.org/jira/browse/CAY-2356
             Project: Cayenne
          Issue Type: Bug
          Components: Core Library
    Affects Versions: 4.0.B1, 4.1.M1
            Reporter: Nikita Timofeev
            Priority: Minor


This query:
{code}
EJBQLQuery asc = new EJBQLQuery("select a, count(p) from Artist a LEFT JOIN a.paintingArray
p GROUP BY a order by count(p) DESC");
{code}
Produces following SQL:
{code:sql}
SELECT
    t0.ARTIST_NAME AS ec0_0, 
    t0.DATE_OF_BIRTH AS ec0_1,
    t0.ARTIST_ID AS ec0_2, 
    COUNT(*) AS sc1
FROM
    ARTIST t0
    LEFT OUTER JOIN PAINTING t1 ON (t0.ARTIST_ID = t1.ARTIST_ID)
GROUP BY t0.ARTIST_NAME, t0.DATE_OF_BIRTH, t0.ARTIST_ID
ORDER BY COUNT(*)
{code}

Note *{{COUNT( * )}}* that gives unexpected result, if there are no paintings it will return
*1* instead of *0*, {{COUNT(t1.PAINTING_ID)}} should be used instead.



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