Re: Recent updates

> Do you want to look at this Bruce? I haven't looked at it yet, but think
> it might be deeper into the backend than the parser (haven't run into
> mcxt.c before).
>
> I am testing on a Friday's version of the cvs tree.

The problem appears to be in the sorting of nulls, which is used by
UNION ALL:

    test=> select null order by 1;
    ERROR:  type id lookup of 0 failed

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