On 04/30/2015 01:57 PM, Robert Haas wrote:
2. There should be a compatibility GUC to restore the old behavior. The new behavior should be the default, because if we're not confident that the new behavior will be better for most people, we have no business installing it in the first place (plus few people will try it). But just in case it turns out to suck for some people, we should provide an escape hatch, at least for a few releases.
You can override the ndistinct estimate with ALTER TABLE. I think that's enough for an escape hatch.
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