In the LockTag if tupleId is represented by blkno and offnum then is blockId mentioned below the same as blkno?
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. Finally if
this is a tuple level lock (we currently never do this) then both
the blockId and tupleId are set to valid specifications. "if tupleId is represented by blkno and offnum then is blockId mentioned below the same as blkno?
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