Proposal: Local indexes for partitioned table

From: Maksim Milyutin <m(dot)milyutin(at)postgrespro(dot)ru>
To: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Proposal: Local indexes for partitioned table
Date: 2017-03-01 10:53:33
Message-ID: c8fe4f6b-ff46-aae0-89e3-e936a35f0cfd@postgrespro.ru
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Hi hackers!

As I've understood from thread [1] the main issue of creating local
indexes for partitions is supporting REINDEX and DROP INDEX operations
on parent partitioned tables. Furthermore Robert Haas mentioned the
problem of creating index on key that is represented in partitions with
single value (or primitive interval) [1] i.e. under the
list-partitioning or range-partitioning with unit interval.

I would like to propose the following solution:

1. Create index for hierarchy of partitioned tables and partitions
recursively. Don't create relfilenode for indexes on parents, only
entries in catalog (much like the partitioned table's storage
elimination in [2]). Abstract index for partitioned tables is only for
the reference on indexes of child tables to perform REINDEX and DROP
INDEX operations.

2. Specify created indexes in pg_depend table so that indexes of child
tables depend on corresponding indexes of parent tables with type of
dependency DEPENDENCY_NORMAL so that index could be removed separately
for partitions and recursively/separately for partitioned tables.

3. REINDEX on index of partitioned table would perform this operation on
existing indexes of corresponding partitions. In this case it is
necessary to consider such operations as REINDEX SCHEMA | DATABASE |
SYSTEM so that partitions' indexes wouldn't be re-indexed multiple times
in a row.

Any thoughts?

1.
https://www.postgresql.org/message-id/CA+TgmoZUwj=QYnaK+F7xEf4w_e2g3XxdMnSNZMZjuinHRcOB8A@mail.gmail.com
2.
https://www.postgresql.org/message-id/2b0d42f2-3a53-763b-c9c2-47139e4b1c2e%40lab.ntt.co.jp

--
Maksim Milyutin
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company

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