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由 Tom Lane 提交于
for unhandled clause types ought to be 0.5, not 1.0. I fear I introduced this silliness due to misreading the intent of the very-poorly-structured code that was there when we inherited the file from Berkeley. The lack of sanity in this behavior was exposed by an example from Sim Zacks. (Arguably this is a bug fix and should be back-patched, but I'm a bit hesitant to introduce a possible planner behavior change in the back branches; it might detune queries that worked acceptably in the past.) While at it, make estimation for DistinctExpr do something marginally realistic, rather than just defaulting.
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