Re: [HACKERS] Proposal: Local indexes for partitioned table

On Mon, Oct 23, 2017 at 11:12 AM, Alvaro Herrera
 wrote:
> I started with Maksim's submitted code, and developed according to the
> ideas discussed in this thread.  Attached is a very WIP patch series for
> this feature.
>
> Many things remain to be done before this is committable:  pg_dump
> support needs to be written.  ALTER INDEX ATTACH/DETACH not yet
> implemented.  No REINDEX support yet.  Docs not updated (but see the
> regression test as a guide for how this is supposed to work; see patch
> 0005).  CREATE INDEX CONCURRENTLY not done yet.
>
> I'm now working on the ability to build unique indexes (and unique
> constraints) on top of this.

Cool.  Are you planning to do that by (a) only allowing the special
case where the partition key columns/expressions are included in the
indexed columns/expressions, (b) trying to make every insert to any
index check all of the indexes for uniqueness conflicts, or (c)
implementing global indexes?  Because (b) sounds complex - think about
attach operations, for example - and (c) sounds super-hard.  I'd
suggest doing (a) first, just on the basis of complexity.

I hope that you don't get so involved in making this unique index
stuff work that we don't get the cascading index feature, at least,
committed to v11.  That's already a considerable step forward in terms
of ease of use, and I'd really like to have it.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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