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From: Heikki Linnakangas <[email protected]>
To: Tom Lane <[email protected]>
To: Greg Stark <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Pg Hackers <[email protected]>
Subject: Re: On partitioning
Date: Mon, 1 Sep 2014 19:12:17 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 09/01/2014 06:59 PM, Tom Lane wrote:
> Greg Stark <[email protected]> writes:
>> On Sun, Aug 31, 2014 at 9:03 PM, Tom Lane <[email protected]> wrote:
>>> Aside from costing planning time, most likely that would forever prevent
>>> us from pushing some types of intelligence about partitioning into the
>>> executor.
>
>> How would it affect this calculus if there were partitioned indexes
>> which were created on the overall table and guaranteed to exist on
>> each partition that the planner could use -- and then possibly also
>> per-partition indexes that might exist in addition to those?
>
> That doesn't actually fix the planning-time issue at all.  Either the
> planner considers each partition individually to create a custom plan
> for it, or it doesn't.

Hmm. Couldn't you plan together all partitions that do have the same 
indexes? In other words, create a custom plan for each group of 
partitions, rather than each partition?

- Heikki



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