Re: [HACKERS] [POC] hash partitioning

On Thu, Oct 12, 2017 at 3:43 PM, Andres Freund <andres@anarazel.de> wrote:
> Are we going to rely on the the combine function to stay the same
> forever after?

If we change them, it will be a pg_upgrade compatibility break for
anyone using hash-partitioned tables with more than one partitioning
column.  Dump and reload will also break unless
--load-via-partition-root is used.

In other words, it's not utterly fixed in stone --- we invented
--load-via-partition-root primarily to cope with circumstances that
could change hash values --- but we sure don't want to be changing it
with any regularity, or for a less-than-excellent reason.

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


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