Automatic Index Creation for Column Types

Hi,

I don't see indication that the capability described below exists in
Postgres (or any RDBMS), so this is likely a feature request --

For column types that are frequently defined in tables, and which are
typically indexed, it would be helpful to be able to specify in the type
definition of the column that its addition/creation into a table should
be automatically accompanied by the creation of an associated index.

Auto-index generation for a specific column type would be overridable
for specific tables, as you wouldn't always want to auto-create an index
at the time of column addition to a table. In the case of CREATE TABLE,
this would be less of a concern, and more of a concern for ALTER TABLE
ADD COLUMN.

Such a configuration would also specify the type of index.

What do you think ?

Thanks,
Charles Sheridan