> Why is there cmax in tuple ? cxxx is used to determine
> if tuple was inserted/deleted by current command or
> past command. Because one command can't both insert
> and delete the same tuple, only something like "cupd"
> might be needed and flag which tells you whether cupd
> is time of insert or delete. This saves 4byte from
> header ..
If a tuple was inserted and updated in current transaction,
how could we judge if the tuple was valid for a given
However there could be other improvements.
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