Re: exec_tlist_length

> Vadim (or anyone else), can you comment on the use of
> exec_tlist_length() vs. ExecTargetListLength().  This was changed in
> Mariposa by removing the first one.
>
> The first is called only in the planner.c, and computes the length as:
>
>     len = 0;
>     foreach(tl, targetlist)
>     {
>         curTle = lfirst(tl);
>
>         if (curTle->resdom != NULL)
>             len++;
>     }
>     return len;
>
> while ExecTargetListLength() uses:
>
>     len = 0;
>     foreach(tl, targetlist)
>     {
>         curTle = lfirst(tl);
>
>         if (curTle->resdom != NULL)
>             len++;
>         else
>             len += curTle->fjoin->fj_nNodes;
>     }
>     return len;
>
> The second counts resdom as one, or add fj_nNodes.  Which is correct, or
> are they used for different purposes.  Seems like the second is more
> correct.

I have done some more research and found fj_nNodes is not used
(referenced in the FIXED_SETS code), so I have removed the first
function and make them all reference the second.

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