Hi Depends on usage, but often times the detoasting is called from DatumGet***** macros
The values are detoasted only when it is required #define PG_GETARG_TEXT_PP(n) DatumGetTextPP(PG_GETARG_DATUM(n)) #define DatumGetTextPP(X) ((text *) PG_DETOAST_DATUM_PACKED(X)) #define PG_DETOAST_DATUM(datum) >pg_detoast_datum((struct varlena *) DatumGetPointer(datum)) Regards Pavel Stehule 2015-05-06 15:00 GMT+02:00 Rui Hai Jiang <ruihaiji...@msn.com>: > Hello, > > I've been reading the PostgreSQL code for weeks to figure out how TOAST > works. > I couldn't find where are the TOAST function called to detoast a tuple > comes from a select query, for example, select * from table_name. > Does anyone know this? Can you give me some help? And any help would save > me a lot of time. > > Thanks, > Rui Hai > > > > -- > Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-hackers >
