On Wed, Sep  6, 2017 at 10:43:39AM -0400, Robert Haas wrote:
> helps.  I don't think we can just indefinitely continue to resist
> providing manual control over this behavior on the theory that some
> day we'll fix it.  It's been six years and we haven't made any
> significant progress.  In some cases, a long delay without any
> progress might just point to a lack of effort that should have been
> applied, but in this case I think it's because the problem is
> incredibly hard.

Add to that, we didn't even document the behavior until last year:

        commit fab9d1da4a213fab08fe2d263eedf2408bc4a27a
        Author: Bruce Momjian <br...@momjian.us>
        Date:   Tue Jun 14 16:11:46 2016 -0400
        
            document when PREPARE uses generic plans
        
            Also explain how generic plans are created.
            Link to PREPARE docs from wire-protocol prepare docs.
        
            Reported-by: Jonathan Rogers
        
            Discussion: 
https://www.postgresql.org/message-id/flat/561E749D.4090301%40socialserve.com

-- 
  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +


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