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Date: Thu, 12 Dec 2013 11:25:31 -0800 (PST)
From: David Johnston <polobo@yahoo.com>
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Subject: Re: NULLs and composite types
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Dean Gibson (DB Administrator)-2 wrote
> What's going on?  I can provide more detail if requested.  Of course, an 
> obvious workaround is to use in a VIEW:
> 
> ... NULLIF( location, ROW( NULL, NULL )::"GeoPosition" ) ...
> 
> but I'd like to know the cause.

Cannot test right now but the core issue is that IS NULL on a record type
evaluates both the scalar whole and the sub-components.  Try using IS [NOT]
DISTINCT FROM with various target expressions and see if you can get
something more sane.

David J.




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