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
