funny comment

Here is a comment from primnodes.h. I don't know who 'sp' is, but I
would like to meet him.

---------------------------------------------------------------------------

* ----
* NOTE: in the good old days 'opno' used to be both (or either, or
* neither) the pg_operator oid, and/or the pg_proc oid depending
* on the postgres module in question (parser->pg_operator,
* executor->pg_proc, planner->both), the mood of the programmer,
* and the phase of the moon (rumors that it was also depending on the day
* of the week are probably false). To make things even more postgres-like
* (i.e. a mess) some comments were referring to 'opno' using the name
* 'opid'. Anyway, now we have two separate fields, and of course that
* immediately removes all bugs from the code... [ sp :-) ].
* ----------------
*/
typedef struct Oper
{
NodeTag type;

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