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

On 1/4/18 23:08, David Rowley wrote:
> On 5 January 2018 at 11:01, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
>> (The more I think of this, the more I believe that pg_inherits is a
>> better answer. Opinions?)
>
> I admit to not having had a chance to look at any code with this yet,
> but I'm just thinking about a case like the following.
>
> CREATE TABLE part (a INT, b INT) PARTITION BY RANGE (a);
> CREATE TABLE part_a1 PARTITION OF part FOR VALUES FROM (0) TO (10)
> PARTITION BY RANGE (b);
> CREATE TABLE part_a1_b1 PARTITION OF part_a1 FOR VALUES FROM (0) TO (10);
>
> CREATE INDEX ON part_a1 (a); -- sub-partition index (creates index on
> part_a1_b1)
>
> CREATE INDEX ON part (a); -- What do we do here?
>
> Should we:
>
> 1. Create another identical index on part_a1_b1; or
> 2. Allow the existing index on part_a1_b1 to have multiple parents; or
> 3. ERROR... (probably not)

4. It should adopt part_a1 and its subindexes into its hierarchy. That
shouldn't be a problem under the current theory, should it?

--
Peter Eisentraut http://www.2ndQuadrant.com/
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