George Pavlov wrote:
> thanks fo the reply. i was misled by pgAdmin (1.6) giving both as
> "record" in the datatype (i thought "row" and "?column?" were just "best
> guess" column headers). 
> 
> so, if they are indeed differently shaped is there any way to make them
> be the same shape?
> 
> note that this one also fails with the same error (one would think these
> are the "same shape"):
> 
> select 
>   (select (1,2)) 
> is distinct from 
>   (select (1,2)) 
> ;

This one works:

alvherre=# select
  row(1,2)
is distinct from
  row(1,2)
;
 ?column? 
----------
 f
(1 fila)

Is that what you're after?

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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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
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