Re: jsonb format is pessimal for toast compression - Mailing list pgsql-hackers

Bruce Momjian <bruce@momjian.us> writes:
> On Thu, Sep 25, 2014 at 02:39:37PM -0400, Tom Lane wrote:
>> BTW, it seems like there is consensus that we ought to reorder the items
>> in a jsonb object to have keys first and then values, independently of the
>> other issues under discussion.  This means we *will* be breaking on-disk
>> compatibility with 9.4beta2, which means pg_upgrade will need to be taught
>> to refuse an upgrade if the database contains any jsonb columns.  Bruce,
>> do you have time to crank out a patch for that?

> Yes, I can do that easily.  Tell me when you want it --- I just need a
> catalog version number to trigger on.

Done --- 201409291 is the cutover point.
        regards, tom lane