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It is perfectly valid to have a query like:
Match None of the following:
- Role is ANY of the following:
-- 'Teacher'
-- 'Editing teacher'
-- 'Manager'; AND
- Keyword is NONE of the following:
-- 'Kevin'
However, due to the way in which the query is constructed, this leads to
a query which includes
WHERE NOT ef.id IS NOT NULL
AND NOT
u.id IN (SELECT userid FROM {role_assignments} WHERE roleid IN (...) AND contextid IN (...))
AND NOT
NOT (u.firstname || ' ' || u.lastname LIKE '%Kevin%')
The use of NOT NOT is valid in Postgres, MariaDB, MySQL, and MSSQL, but
not in Oracle.
To counter this when the outer jointype is of type NONE, we must wrap
each of the inner WHERE clauses in a set of brackets, which makes the
query:
WHERE NOT ef.id IS NOT NULL
AND NOT
(u.id IN (SELECT userid FROM {role_assignments} WHERE roleid IN (...) AND contextid IN (...)))
AND NOT
(NOT (u.firstname || ' ' || u.lastname LIKE '%Kevin%'))
Whilst Oracle does not support the use of `AND NOT NOT ...`, it does support
`AND NOT (NOT ...)`
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