Re: Extended Statistics set/restore/clear functions.

On Mon, Nov 17, 2025 at 08:53:35PM +0800, jian he wrote:
> segfault:
> SELECT '[{"attributes" : [1,2,3,4,5,67,6,7,8], "ndistinct" : 4}]'::pg_ndistinct;
>
> because src/backend/statistics/mvdistinct.c line: 310, Assert
> Assert((item->nattributes >= 2) && (item->nattributes <= STATS_MAX_DIMENSIONS));

Ahah, good one here.  Perhaps we had better switch this assertion to
become an elog() with the import functions in mind, as well.  It may
be worth double-checking the other deserialization paths, as well.  We
need to be super careful about this stuff for data imports.
--
Michael