Unneccessary cmax in heap tuple ? - Mailing list pgsql-hackers

From devik@cdi.cz
Subject Unneccessary cmax in heap tuple ?
Date
Msg-id 39F699B4.44FD7897@cdi.cz
Whole thread Raw
In response to Doesn't anyone around here run the regression tests on patches?  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
Hello,
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 .. 

devik



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