Re: RFC: compression dictionaries for JSONB

On 2021-Oct-08, Matthias van de Meent wrote:

> On Fri, 8 Oct 2021 at 11:47, Aleksander Alekseev
> <aleksander@timescale.com> wrote:

> > In order to do this, the SQL syntax should be modified. The proposed
> > syntax is based on Matthias van de Meent's idea [6]:
> 
> Seems fine
> 
> > ```
> > CREATE TYPE <type-name> AS JSONB_DICTIONARY (
> >   learn_by = { {"table_a", "column_a"}, {"table_b", "column_b"}, ... },

Actually, why is it a JSONB_DICTIONARY and not like

CREATE TYPE name AS DICTIONARY (
  base_type = JSONB, ...
);

so that it is possible to use the infrastructure for other things?  For
example, perhaps PostGIS geometries could benefit from it -- or even
text or xml columns.

The pg_type entry would have to provide some support procedure that
makes use of the dictionary in some way.  This seems better than tying
the SQL object to a specific type.

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