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Re: Small change needed to support Greenplum DB

From: Dave Page <dpage(at)postgresql(dot)org>
To: Luke Lonergan <LLonergan(at)greenplum(dot)com>
Cc: pgadmin-support(at)postgresql(dot)org
Subject: Re: Small change needed to support Greenplum DB
Date: 2007-10-12 15:40:08
Message-ID: 470F9558.9020908@postgresql.org (view raw or flat)
Thread:
Lists: pgadmin-support
Thanks Luke - fix committed for 1.8 using the DISTINCT ON version of the
query.

Regards, Dave

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


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