On Thu, Jun 3, 2010 at 7:16 PM, Mark Kirkwood
<mark(dot)kirkwood(at)catalyst(dot)net(dot)nz> wrote:
> Maybe I gave this guy a bad title - is it a concern that the 'width'
> estimate is so far off for xml datatypes (because of no = op)? It seemed to
> me that this could result in some bad plan choices (e.g in subqueries etc).
It's possible. I don't really see a reason not to add an = operator
for XML - does anyone else?
It would need to be done by updating src/include/catalog/pg_*.h,
rather than via SQL, of course.
--
Robert Haas
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