the offnum of LOCKTAG I gather indicates which row (tuple) is being
locked in a row level locking. But when I lock 2 diffrent rows of a
table, offset for both is 0. and also offset is 0 if i take a table lock
on the same table. (blkno is the same for all three locks)..shouldnt the
OffsetNumber
following is taken from postgresql-7.3.2/src/backend/storage/lmgr/readme:
"If we are setting a table level lock
both the blockId and tupleId (in an item pointer this is called
the position) are set to invalid, if it is a page level lock the
blockId is valid, while the tupleId is still invalid. Fi
