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From Mark Miller <>
Subject Re: The new Contrib QueryParser should not be slated to replace the old one yet
Date Wed, 12 Aug 2009 11:16:32 GMT
Michael Busch wrote:
> We should also realize that - thanks to Luis and Adriano - we now have 
> actual code that can be the basis of discussions and that we can take 
> and improve. No matter if this new QP is going to replace the old one 
> or not, I'm very thankful that the two went through the effort of 
> creating it. This framework has been very successful internally and we 
> wanted to share something good with the Lucene community.
>  Michael
Agreed! I'd also like to extend my thanks to Luis and Adriano! And to 
IBM for donating the code! I am certainly not looking a gift horse in 
the mouth.

And I think its still very likely this parser will replace the old. 
Despite my rant to not deprecate the current QP yet, I do think its a 
nice design, and I do think it has a lot of value going forward. I just 
think its a big enough deal that we should let it sit for a release in 
contrib while everyone has a chance to take stalk of it. If you look at 
the Qsol parser I used to play around with, it also has an intermediate 
abstract query tree (its just way uglier and less plugable - dont go 
look ;) ) - I think that makes a lot of sense, and I do know that it 
will bring benefits to many developers in the future.

I just think it makes sense to wait a bit and see how things shake out. 
I think that will give us more freedom in terms of addressing the 
shortcomings we/users may find.

Giving users such a large framework to extends is a back compat 
nightmare ! Lets just see how things go for a bit before we start really 
locking in back compat on the thing (which we should presumably do if it 
were to become the new QP).

- Mark

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