| Match an objID to a PhotoObj and set/unset the first field bit. |
| Given an objID this function determines whether there is a PhotoObj with a matching (skyversion, run, rerun, camcol, field, obj) and returns the objID with the first field bit set properly to correspond to that PhotoObj. It returns 0 if there is no corresponding PhotoObj. It does not matter whether the first field bit is set or unset in the input objID. |
| name | type | length | inout | pnum |
| bigint | 8 | input | 0 | |
| @objID | bigint | 8 | input | 1 |