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constants through full joins, as in select * from tenk1 a full join tenk1 b using (unique1) where unique1 = 42; which should generate a fairly cheap plan where we apply the constraint unique1 = 42 in each relation scan. This had been broken by my patch of 2008-06-27, which is now reverted in favor of a more invasive but hopefully less incorrect approach. That patch was meant to prevent incorrect extraction of OR'd indexclauses from OR conditions above an outer join. To do that correctly we need more information than the outerjoin_delay flag can provide, so add a nullable_relids field to RestrictInfo that records exactly which relations are nulled by outer joins that are underneath a particular qual clause. A side benefit is that we can make the test in create_or_index_quals more specific: it is now smart enough to extract an OR'd indexclause into the outer side of an outer join, even though it must not do so in the inner side. The old coding couldn't distinguish these cases so it could not do either. |
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