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From Benson Margulies <>
Subject Re: [jira] Commented: (JENA-40) Query that runs more or less forever
Date Thu, 03 Feb 2011 23:00:03 GMT
Aha. Well, this is the same query that caused the NPE (in terms of
shape). And, for four out of five cases I run in test cases, it runs

Here's the diff between a fast one and a slow one ...

<          ?root (rex:text|rex:alternateText) "Bongani Khumalo" .
>          ?root (rex:text|rex:alternateText) "Al-Qaida" .

On Thu, Feb 3, 2011 at 5:55 PM, Andy Seaborne
<> wrote:
> Could you explain the testing issue?  The queries are quite long and while
> it may be obvious to you, it isn't to me!
>        Andy
> On 03/02/11 22:44, Benson Margulies wrote:
>> Sure. Sorry to transgress. In this case, since the very same query
>> (structurally) had very different performance characteristics
>> depending on which string was used to match a literal, I jumped to a
>> conclusion. In particular, I'm assuming that the nature of OPTIONAL is
>> that the 'required' part constrains the second part, I didn't think
>> that I was inventing something like that.

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