Re: View Index and UNION

Stefan Keller <sfkeller@gmail.com> writes:
> Given following schema:

> 1. TABLE a and TABLE b, each with INDEX on attribute geom.

> 2. A VIEW with union:

> CREATE VIEW myview AS
>   SELECT * FROM a
>   UNION
>   SELECT * FROM b;

> 3. And a simple query with KNN index and a coordinate "mypos" :

> SELECT * FROM myview
> ORDER BY ST_Geomfromtext(mypos) <-> myview.geom

I think this would work out-of-the-box in 9.1 or later, if you
made the view use UNION ALL instead of UNION.
        regards, tom lane