Etsuro Fujita wrote:
> On 2016/01/28 12:13, Robert Haas wrote:

> >I don't think this is a good idea.  Most of the time, no system
> >columns will be present, and we'll just be scanning the Bitmapset
> >twice rather than once.  Sure, that doesn't take many extra cycles,
> >but if the point of all this is to micro-optimize this code, that
> >particular change is going in the wrong direction.
> I thought that is a good idea, considering the additional overhead is
> little, because that would be useful for some use-cases.  But I think we
> need more discussions about that, so if there are no objections from Alvaro
> (or anyone), I'll leave that part as-is.

I'm happy to defer.

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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