Zdenek Kotala wrote:
Heikki Linnakangas napsal(a):
Besides, the "read all formats" approach wouldn't really avoid it
either. If you passed a toasted datum to a function, when the function
needs to detoast it, detoast_datum still wouldn't know whether the
datum is in old or new format. You'd still need to detoast all values
in the tuple somewhere before they could be passed around.
If you look into pg_upgrade prototype patch I added page version
information into HeapTupleData structure. It keeps information about
format. All chunked data are stored on a pages with same page versions.
I think these two things are enough to have all necessary information.
Functions are passed just a Datum, not HeapTupleData.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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