Index + mismatching datatypes [WAS: index on custom function; explain]

* Yann Michel <yann-postgresql@spline.de> wrote:

> 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

I've got a similar problem: I have to match different datatypes,
ie. bigint vs. integer vs. oid.

Of course I tried to use casted index (aka ON (foo::oid)), but 
it didn't work. 

What am I doing wrong ?


cu
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