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From Mark Harwood <markharw...@yahoo.co.uk>
Subject Re: Extending query parser with MinShouldMatch syntax
Date Sat, 13 Sep 2008 18:32:23 GMT
You might want to try the XML query parser in contrib. I deliberately created this to allow
remote clients to have full control over lucene (filters, caching etc) without trying to bloat
the standard query parser with special characters. 



On 13 Sep 2008, at 18:26, "Shai Erera" <serera@gmail.com> wrote:

Hi,

I would like to suggest an extension to Lucene's query syntax, which will allow application
developers to send query constraints with a MinShouldMatch value to the search engine, from
the client application. Such constraints are for example ACL (security information) and other
filters on the queries. Client applications simply have no way to tell the back-end to consider
some filters as min-should-match (or msm).

Suppose that I propose a file-type filter to the user, and the user typed some keywords, like
"hello world". The user gets back results, and he now wants to filter those results by select
"PDF" from the file-type filter. The only query the client application can send to the back-end
is "hello world +filetype:pdf". But that doesn't work as expected. If queries are run with
OR operator as the default, then the documents that will be returned are those that include
filetype:pdf, and may or may not include "hello world". This is not what the user expected
though.

The only option today for the application is to parse the query, understand that this is a
msm filter (though how will it do it is not very obvious, and not easily extendable to other
filters) and set a msm on the resulting query.

Instead, we could offer the following syntax:
- term# - defaults to msm '1'.
- term#<value> - set msm according to the specified value

What do you think?

Shai



      

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