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From: Amit Langote <[email protected]>
To: Bruce Momjian <[email protected]>
To: David Rowley <[email protected]>
Cc: Jonathan S. Katz <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL 12: Feature Highlights
Date: Wed, 22 May 2019 09:23:13 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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On 2019/05/21 23:55, Bruce Momjian wrote:
> On Sun, May 19, 2019 at 02:26:48AM +1200, David Rowley wrote:
>> Thanks, typing that up.  I think it lacks a bit detail about what's
>> actually changed.  The change is fairly evident and people can see
>> when it takes effect when they look at EXPLAIN and see that the
>> Append/MergeAppend node is missing. Also, an Append/MergeAppend may
>> exist for inheritance tables and an Append can exist for a simple
>> UNION ALL. Both of those cases can have subplans removed to leave only
>> a single subplan, to which the additional parallel paths will be
>> considered.
> 
> This brings up a few points.  First, it seems the change affects
> partitioned tables and UNION ALL, which means it probably needs to be
> listed in two sections.

How about putting this only in E.1.3.1.3. Optimizer?

Thanks,
Amit






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