Programmatically create proximity or slop queries using Lucene's flexible parser

[Kasper van den Berg <Ka...@maastro.nl>]

Hi all,

(Cross posted to stackoverflow yesterday (http://stackoverflow.com/q/17154510/814206), no answers at SO yet, perhaps java-users@lucene is a better place for this question; I hope not to annoy any of you with these duplicate messages)

In Lucene (currently using version 4.1) using Lucene's flexible query parser , is it possible to build(…) proximity queries from ProximityQueryNode?

The code uses a flexible parser in order to parse (partial) queries read from a file into QueryNode; process these QueryNodes; and finally search using the built queries.

The three phases of the flexible parser:
* Parsing, does what I want it to do.
  The StandardSyntaxParser parses even complex queries with proximity operators (for example "(\"letter comes\"~3 \"agitated employees\"~4 \"worried about salaries\"~1) AND (\"letter comes agitated employees worried about salaries\"~8)" parses correctly (to a group containing SlopQueryNode; having slop queries is adequate).

* Processing, removes proximity and slop nodes from the tree; skipping processing might work and allows avoiding this problem.

* Building, replaces proximity and slop with BooleanQuery or ignores it and emits TermQuery even for unprocessed QueryNode trees that do contain ProximityQueryNodes.


What can I do, so that Lucene parses partial queries to QueryNode parse trees, expand the trees to search for other terms nearby, and submit the query to the searcher?


Config:

Lucene version 4.1, if needed I'll upgrade to 4.3.2
Parser ….flexible.standard.Standard, if needed I can switch parser but preferably one of the flexible ones.



With kind regards,
Kasper
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