Re: Small change needed to support Greenplum DB

<p><font size="2">Yes it does!<br /><br /> - Luke<br /><br /> Msg is shrt cuz m on ma treo<br /><br />  -----Original
Message-----<br/> From:   Dave Page [<a href="mailto:dpage@postgresql.org">mailto:dpage@postgresql.org</a>]<br />
Sent:  Friday, October 12, 2007 10:21 AM Eastern Standard Time<br /> To:     Luke Lonergan<br /> Cc:    
pgadmin-support@postgresql.org<br/> Subject:        Re: [pgadmin-support] Small change needed to support Greenplum
DB<br/><br /> Luke Lonergan wrote:<br /> > Hi all,<br /> ><br /> > A customer of ours is using pgAgent with
GreenplumDatabase and needs a<br /> > change to one of the queries used by pgAgent to allow it to work with<br />
>Greenplum.<br /> ><br /> > Here is the conversation:<br /> >   _<a
href="http://groups.google.com/group/pgsql.bugs/browse_thread/thread/27866354fa4d7a5e/60e6e5de3c5156d4#60e6e5de3c5156d4">http://groups.google.com/group/pgsql.bugs/browse_thread/thread/27866354fa4d7a5e/60e6e5de3c5156d4#60e6e5de3c5156d4</a><br
/>><br /> > _The problem is that Greenplum does not support some correlated<br /> > subqueries, so Jon created
aversion of the query that is both faster<br /> > and does not use a correlated subquery.<br /> ><br /> > The
requestedchange is from this in pgaJob.cpp:<br /><br /><br /> Hi Luke,<br /><br /> Does Greenplum support DISTINCT ON?
Specifically,<br/><br /> SELECT j.*, cl.*, ag.*, sub.jlgstatus<br /> FROM pgagent.pga_job j JOIN<br />     
pgagent.pga_jobclasscl ON cl.jclid=jobjclid LEFT OUTER JOIN<br />      pgagent.pga_jobagent ag ON ag.jagpid=jobagentid
JOIN<br/>      (SELECT DISTINCT ON (jlgjobid) jlgstatus, jlgjobid<br />       FROM pgagent.pga_joblog<br />       ORDER
BYjlgjobid, jlgid desc) sub ON sub.jlgjobid = j.jobid<br /> --       + restriction +<br /> ORDER BY jobname;<br /><br
/>Regards, Dave.<br /></font>