"Jonah H. Harris" <[EMAIL PROTECTED]> writes: > On 10/26/06, Tom Lane <[EMAIL PROTECTED]> wrote: >> This makes some really quite unacceptable assumptions about >> the meaning and encoding of typmod ... > > True, so VARCHAR seems like the only one? That's the only one I've > really encountered in the field on a fairly regular basis.
I think what you want is to add a new method entry in pg_type to allow a type to declare a method to tell you whether a change is work-free or not. Then any type, even user-defined types, can allow some changes to be work-free and some not without exposing any implementation details outside the type. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
