Tom Lane wrote:
> Hmm ... I'm not sure that I buy that particular argument. If you're
> concerned that the grammar could not handle "FROM x JOIN y USING (z)",
> wouldn't it also have a problem with "FROM x JOIN y ON (z)"?
>
> It might work anyway, since the grammar should know whether ON or USING
> is needed to complete the JOIN clause. But I think you'd better check
> whether the complete join syntax works there, even if we're not going
> to support it now.
Tomas spent some time trying to shoehorn the whole join syntax into the
FROM clause, but stopped once he realized that the joined_table
production uses table_ref, which allow things like TABLESAMPLE, SRFs,
LATERAL, etc which presumably we don't want to accept in CREATE STATS.
I didn't look into it any further. But because of the other
considerations, I did end up changing the ON to FOR.
So the attached is the final version which I intend to push shortly.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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