Обсуждение: pgsql: Arrange to squeeze out the MINIMAL_TUPLE_PADDING in the tuple

Log Message:
-----------
Arrange to squeeze out the MINIMAL_TUPLE_PADDING in the tuple representation
written to temp files by tuplesort.c and tuplestore.c.  This saves 2 bytes per
row for 32-bit machines, and 6 bytes per row for 64-bit machines, which seems
worth the slight additional uglification of the tuple read/write routines.

Modified Files:
--------------
    pgsql/src/backend/utils/sort:
        tuplesort.c (r1.87 -> r1.88)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/sort/tuplesort.c?r1=1.87&r2=1.88)
        tuplestore.c (r1.42 -> r1.43)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/sort/tuplestore.c?r1=1.42&r2=1.43)
    pgsql/src/include/access:
        htup.h (r1.101 -> r1.102)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/access/htup.h?r1=1.101&r2=1.102)