RE: HASH GROUP BY
Date: Wed, 23 Apr 2008 14:20:58 -0500
Message-ID: <3B8B6A1700202C43A89D61CE495C894E0F02EB41D5@MSPM1BMSGM103.ent.core.medtronic.com>
Now I understand what you mean by buggy. It no longer sorts the rows. If you have code that relies on a group by being in sorted order, then the code will no longer work. If you have had to disable this in the past to get correct results, then you will need to continue disabling it indefinitely. The only way to fix it and reenable the hashing group by is to change the code.
select column_a, column_b, count(column_c)
from table_abc
group by column_a, column_b
order by column_a, column_b
You need to add the order by above to your code where you just had the "group by" alone before.
Pat
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Elliott, Patrick Sent: Wednesday, April 23, 2008 1:44 PM
To: Rob.Dempsey_at_5one.co.uk; oracle-l_at_freelists.org Subject: RE: HASH GROUP BY
This is enabled by default in version 9.2.0.5 and up. Are you explicitly disabling it in your environment?
Pat
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Rob Dempsey Sent: Wednesday, April 23, 2008 12:08 PM To: oracle-l_at_freelists.org
Subject: HASH GROUP BY
Hi
Our current Oracle version -> 10.2.0.1
Does anyone know what version this feature has been fixed in. I would like to enable the feature, but it seems to have been very buggy (especially with wrong results)
Rob
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