Tom Lane f41803bb39 Refactor planner's pathkeys data structure to create a separate, explicit ... representation of equivalence classes of variables. This is an extensive rewrite, but it brings a number of benefits: * planner no longer fails in the presence of "incomplete" operator families that don't offer operators for every possible combination of datatypes. * avoid generating and then discarding redundant equality clauses. * remove bogus assumption that derived equalities always use operators named "=". * mergejoins can work with a variety of sort orders (e.g., descending) now, instead of tying each mergejoinable operator to exactly one sort order. * better recognition of redundant sort columns. * can make use of equalities appearing underneath an outer join.		2007-01-20 20:45:41 +00:00
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sgml	Refactor planner's pathkeys data structure to create a separate, explicit	2007-01-20 20:45:41 +00:00
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