Do not allow FROM-clause terms on the left side of a RIGHT or FULL JOIN to

Do not allow FROM-clause terms on the left side of a RIGHT or FULL JOIN to
be reordered. [forum:/forumpost/6650cd40b5634f35|forum post 6650cd40b5634f35].
This is probably more strict that necessary to get correct behavior,
but for the first release that supports RIGHT/FULL JOIN it is perhaps better
to be correct than fast.  A less strict constraint might be to prohibit
FROM-clause terms that originate on the left side of a RIGHT JOIN from
crossing from the right side to the left side of a LEFT JOIN.  Revisit this
later.

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