Possible workaround for CORE-1239, Left outer - inner join
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Key: DNET-309
URL: http://tracker.firebirdsql.org/browse/DNET-309
Project: .NET Data provider
Issue Type: Improvement
Components: ADO.NET Provider
Affects Versions: 2.5.2
Environment: All
Reporter: Alexander Muylaert
Assignee: Jiri Cincura
The entity framework often generates statements that go like
from table a
left outer join table b on a.bid = b.id
inner join table c on a.cid = c.id
If this happens, all hell brakes loose in the core and due to the issue
(core-1239), the engine will perform a natural scan on table A.
If table A is big, the impact is immens.
If possible, try to sort the joins on sql generation level. That way the EF
generates the statement as
from table a
inner join table c on a.cid = c.id
left outer join table b on a.bid = b.id
Thanks Alexander
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