create index on column of user defined type?

[Mulert, Bill]

Although I have not seen any documentation that says one cannot do this, 
version 2.1.2 is complaining about defining one.

CREATE TYPE wdm.thing (
       thing_name                 text,
                ...

CREATE TABLE wdm.ctins (
       foo_no                     text,
       item                        frozen<thing>,
       ...


CREATE INDEX foo ON wdm.gtins(item.thing_name);

Is there something I'm missing or is this truly disallowed?



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