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.

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