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Remove overly-pessimistic statement about constraint exclusion.
As of 9.2, constraint exclusion should work okay with prepared statements:the planner will try custom plans with actual values of the parameters,and observe that they are a lot cheaper than the generic plan, and thusnever fall back to using the generic plan. Noted by Tatsuhito Kasahara.1 parentb33f611 commit6e2e12c
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