Re: Add system column support to the USING clause

[Denis Garsh]

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.ga...@arenadata.io