If we are not going to implement this functionality, maybe it’s worth
adding an explicit description to the
[documentation](https://www.postgresql.org/docs/current/queries-table-expressions.html)?
A note like: "JOIN USING doesn’t support system columns. If you need to
join tables by a system column, use the JOIN ON clause."
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Best regards,
Denis Garsh,
C Developer,
d.garsh@arenadata.io
