Anssi Kääriäinen a193372753 Fixed #17886 -- Fixed join promotion in ORed nullable queries ...

The ORM generated a query with INNER JOIN instead of LEFT OUTER JOIN
in a somewhat complicated case. The main issue was that there was a
chain of nullable FK -> non-nullble FK, and the join promotion logic
didn't see the need to promote the non-nullable FK even if the
previous nullable FK was already promoted to LOUTER JOIN. This resulted
in a query like a LOUTER b INNER c, which incorrectly prunes results.

2012-08-21 21:23:57 +03:00

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