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From Doug Cutting <>
Subject Re: Query Rewriting
Date Wed, 11 Sep 2002 22:18:36 GMT
Clemens Marschner wrote:
> I want to perform some rewriting rules on the queries I get. The best way to
> do that is to edit the parse tree.
> However, the Query classes do not contain any methods for reading out or
> altering their contents or to clone them.
> Is there any reason for that? Or is this just a feature nobody has needed
> yet?

The latter.  My style is not to add features that are not used.  But 
several folks have asked for this, so probably it is time to add it.

> I just ask because I fear I will end up rewriting all the Query classes to
> suit my needs, which will be become a tedious integration task as Lucene
> evolves. If there's an interest I could contribute the code then.

Please submit diffs.  It should just be a matter of adding a few simple 
accessors to each query class, e.g., to return BooleanQuery's set of 
boolean clauses, to return TermQuery's term, to return PhraseQuery's 
terms, etc.


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