https://bugs.freedesktop.org/show_bug.cgi?id=82325

--- Comment #2 from Lionel Elie Mamane <lio...@mamane.lu> ---
The execution plan is decided by the database engine, Base (and Query Builder)
plays no role in that. I'm not even sure Base can possibly have any influence
on that; maybe parenthesising the JOIN expression is taken as a clue by the
database engine?

Even assuming Base could have an influence, I don't immediately have a good
idea of how to present that visually... I don't like the idea of taking the
spatial layout left-to-right and/or top-to-bottom because the spatial layout is
IMHO purely presentational and not semantic. Maybe we could annotate the link
lines with numbers or so. Or have a separate dialog that lists the links
(JOINs) and allows to order them.

In the absence of visual clue (that is, without this enhancement request being
fulfilled), one can "always" go to the SQL view and parenthesise the SQL
directly (if the underlying database engine supports that, not all of them do).

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