Can you find any cases where it makes a worse choice than before? Another thing to pay attention to is whether the planning time gets noticeably worse. If we can't find any cases where it loses badly on those measures, I'll feel comfortable in applying it...
I'll see what I can find -- I'll let you know on Monday if I can find any queries that perform worse. My tests so far have shown equivalent or better performance so far but I've only done sort of a survey so far ... I've got plenty of special cases to test that should put this through the paces.
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