Re: Do we want a hashset type?

On Fri, Jun 23, 2023 at 4:23 PM Joel Jacobson <joel(at)compiler(dot)org> wrote:

> On Fri, Jun 23, 2023, at 08:40, jian he wrote:
> > I played around array_func.c
> > many of the code can be used for multiset data type.
> > now I imagine multiset as something like one dimension array. (nested
> > is somehow beyond the imagination...).
>
> Are you suggesting it might be a better idea to start over completely
> and work on a new code base that is based on arrayfuncs.c,
> and aim for MULTISET/SET or anyhashset from start, that would not
> only support int4/int8/uuid but any type?
>
> /Joel
>

select prosrc from pg_proc where proname ~*
'(hash.*extended)|(extended.*hash)';
return around 30 rows.
so it's a bit generic?

I tend to think set/multiset as a one dimension array, so the textual input
should be like a one dimension array.
use array_func.c functions to parse and validate the input.
So different types, one input validation function.

Does this make sense?