Re: alter table set TABLE ACCESS METHOD - Mailing list pgsql-hackers

On Thu, 2021-05-06 at 17:19 -0500, Justin Pryzby wrote:
> If ATRewriteTable didn't
> handle this,
> data would become inaccessible if an AM failed to de-toast tuples.

If the AM fails to detoast tuples, it's got bigger problems than ALTER
TABLE. What about INSERT INTO ... SELECT?

It's the table AM's responsibility to detoast out-of-line datums and
toast any values that are too large (see
heapam.c:heap_prepare_insert()).

Regards,
    Jeff Davis