On Wed, 03 Nov 2010 13:32:18 -0700 Eric Davies <e...@barrodale.com> wrote: > On Informix, we were able to take advantage of the VTI (Virtual Table > Interface) feature to support "table" scans and indexing. (See > http://www.ibm.com/developerworks/data/zones/informix/library/techarticle/db_vti.html > > .) Do you have any idea of how long it will be before SQL/MED on > PostgreSQL will be available, and perhaps how similar it will be to > Informix VTI?
SQL/MED is now under discussion/development for PostgreSQL 9.1, and 9.1 would be released one year after 9.0, maybe around Sep 2011? For detail of release schedule, please see the development plan of PostgreSQL 9.1. http://wiki.postgresql.org/wiki/PostgreSQL_9.1_Development_Plan I looked into VTI documents you've pointed. ISTM that VTI and SQL/MED would have a lot of common ideas, and most of VTI items would be able to be mapped to one of SQL/MED items, except features about updating data and indexing. For example: * PRIMARY ACCESS_METHOD -> HANDLER of FOREIGN DATA WRAPPER * am_scancost() -> FdwRoutine.EstimateCosts() * am_open() -> FdwRoutine.Open() * am_beginscan() -> first call of FdwRoutine.Iterate()? * am_getnext() -> FdwRoutine.Iterate() * am_rescan() -> FdwRoutine.ReOpen() * am_close() -> FdwRoutine.Close() * Table descriptor -> Relation, Form_pg_class * Qual descriptor -> PlanState.qual I hope the summary of SQL/MED described in wiki page helps you. http://wiki.postgresql.org/wiki/SQL/MED Any comments and questions are welcome. Regards, -- Shigeru Hanada -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
