Peter Geoghegan writes:
> On Sun, Dec 6, 2015 at 9:52 AM, Andreas Seltenreich <seltenre...@gmx.de>
>> I've added new grammar rules to sqlsmith and improved some older ones.
> Could you possibly teach sqlsmith about INSERT ... ON CONFLICT DO
> UPDATE/IGNORE? I think that that could be very helpful, especially if
> it could be done in advance of any stable release of 9.5.
In summary, it can't be added ad-hoc, but might still happen in advance
of the release of 9.5.
Adding upsert needs significiant effort because historically,
non-boolean value expression productions yield a random type. This is
not a problem for generating queries, but it is for inserts. Also,
sqlsmith can at the moment only generate sensible value expressions from
column references. Generating a proper upsert would require supporting
type-constraining of productions as well as adding productions for
pulling values out of thin air (e.g., generating atomic value subselects
or calling argumentless functions).
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