Hello.
I have just noticed (by accident) a semantic difference of the not-equal
operator (!=), depending on the style used. For example a query
session.query(Foo).filter(Foo.bar_id != bar.id)
produces SQL like (expected)
SELECT *
FROM foo
WHERE foo.bar_id != %(bar_id_1)s
whereas a query
session.query(Foo).filter(Foo.bar != bar)
produces SQL like (NOT expected)
SELECT *
FROM foo
WHERE (
foo.bar_id != %(bar_id_1)s
OR foo.bar_id IS NULL
)
I thought that
Foo.bar != bar
is just a shortcut for
Foo.bar_id != bar.id
Is this difference intentional?
May I know why (i.e. the motivation)?
Thanks in advance,
Ladislav Lenart
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