Re: ALTER TABLE with ADD COLUMN and ADD PRIMARY KEY USING INDEXthrows spurious "column contains null values"

On Wed, Apr 17, 2019 at 11:55 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> * I'm not sure whether we want to try to back-patch this, or how
> far it should go.  The misbehavior has been there a long time
> (at least back to 8.4, I didn't check further); so the lack of
> previous reports means people seldom try to do it.  That may
> indicate that it's not worth taking any risks of new bugs to
> squash this one.  (Also, I suspect that it might take a lot of
> work to port this to before v10, because there are comments
> suggesting that this code worked a good bit differently before.)
> I do think we should shove this into v12 though.

Shoving it into v12 but not back-patching seems like a reasonable
compromise, although I have not reviewed the patch or tried to figure
out how risky it is.

-- 
Robert Haas
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