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02b3f326b2
report of poor planning in 8.3: it's unsafe to push a constant across an outer join when the outer-join condition is delayed by lower outer joins, unless we recheck the outer-join condition at the upper outer join. 8.2.x doesn't really have the ability to tell whether this is the case or not, but fortunately it doesn't matter --- it seems most desirable to keep the join condition whether it's entirely redundant or not. However, it's usually mostly redundant, so force its selectivity to 1.0. It might be a good idea to back-patch this into 8.1 as well, but I'll refrain until/unless there's evidence that 8.1 actually fails on any cases that this would fix. |
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