Not that I'm aware of, but I've probably never had more than a half-dozen 
sub-clauses as part of my WHERE clause.

It might be worth pinging the Mulgara list specifically.

On Jan 21, 2013, at 6:38 PM, Alistair Young <alistair.yo...@uhi.ac.uk> wrote:

> I was just wondering if there's a limit to how large a query risearch can 
> take via POST. I have a query that gets metadata for resources if they are in 
> certain collections. Each time I increase the collections to search the 
> number of results increases until it suddenly drops away. The search uses 
> 'or' so in theory it should never return less than the previous search. E.g. 
> I get 14, 54, 142 resources back as I increase the collections then suddenly 
> it drops to 80 and stays there no matter how many more categories I put in 
> the search.
> 
> select $object $title $description $creator $date $format $rights $publisher 
> $subject from <#ri>
> where $object <dc:title> $title
> …
> and ($object <http://namespace#isInCategory> <info:fedora/ltk:category_test>
> or $object <http://namespace#isInCategory> <info:fedora/ltk:category_test2>
> …
> or $object <http://namespace#isInCategory> <info:fedora/ltk:category_testn>
> )
> 
> Thanks,
> 
> Alistair

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