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cd2a2ce904
if either of the input relations can legally be joined to any other rels using join clauses. This avoids uselessly (and expensively) considering a lot of really stupid join paths when there is a join restriction with a large footprint, that is, lots of relations inside its LHS or RHS. My patch of 15-Feb-2007 had been causing the code to consider joining *every* combination of rels inside such a group, which is exponentially bad :-(. With this behavior, clauseless bushy joins will be done if necessary, but they'll be put off as long as possible. Per report from Jakub Ouhrabka. Backpatch to 8.2. We might someday want to backpatch to 8.1 as well, but 8.1 does not have the problem for OUTER JOIN nests, only for IN-clauses, so it's not clear anyone's very likely to hit it in practice; and the current patch doesn't apply cleanly to 8.1. |
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