I wonder if it wouldn't be easier to reorder the TupDesc->attrs[] array
according to an attphysid when filling the TupDesc structure, right
after a column was dropped/recreated (before any indexes/constraints are
recreated), so attnum remains, while storage changes.


attnum   attphysid  attname attisdropped

1         1         foo           f
2         2         bar           f

after drop/recreate col:
1         3         foo           f
2         2         bar           f
3         1         foo_del       t

resulting in an attrs array
attrs[0] describing physical col 3
attrs[1] describing physical col 2
attrs[2] describing physical col 1


---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match

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