[HACKERS] pg_detoast_datum_packed and friends

[Joe Conway]

Sorry for my ignorance, but I haven't been able to keep up lately -- 
what is the difference between pg_detoast_datum_packed and 
pg_detoast_datum, and how do I know when to use each? E.g. I notice that 
the related macro PG_GETARG_TEXT_PP is used in place of PG_GETARG_TEXT_P 
in many (but not all) places in the backend.

Thanks,
Joe

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