- altered part of the use contract first set up in #2992; we

- altered part of the use contract first set up in #2992; we
now skip textual label references when copying ORDER BY elements
to the joined-eager-load subquery, as we can't know that these
expressions are compatible with this placement;  either because
they are meant for text(), or because they refer to label names
already stated and aren't bound to a table. fixes #3392