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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2892) Add QueryParser.newFieldQuery
Date Wed, 09 Feb 2011 22:36:57 GMT


Robert Muir commented on LUCENE-2892:

I think this is an easy win for some common use cases from the API perspective.

If no one objects i'll commit in a few days.

> Add QueryParser.newFieldQuery
> -----------------------------
>                 Key: LUCENE-2892
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: QueryParser
>            Reporter: Robert Muir
>             Fix For: 4.0
>         Attachments: LUCENE-2892.patch
> Note: this patch changes no behavior, just makes QP more subclassable.
> Currently we have Query getFieldQuery(String field, String queryText, boolean quoted)
> This contains very hairy methods for producing a query from QP's analyzer.
> I propose we factor this into newFieldQuery(Analyzer analyzer, String field, String queryText,
boolean quoted)
> Then getFieldQuery just calls newFieldQuery(this.analyzer, field, queryText, quoted);
> The reasoning is: it can be quite useful to consider the double quote as more than phrases,
but a "more exact" search.
> In the case the user quoted the terms, you might want to analyze the text with an alternate
analyzer that:
> doesn't produce synonyms, doesnt decompose compounds, doesn't use WordDelimiterFilter

> (you would need to be using preserveOriginal=true at index time for the WDF one), etc
> This is similar to the way google's double quote operator works, its not defined as phrase
but "this exact wording or phrase".
> For example compare results to a query of tests versus "tests".
> Currently you can do this without heavy code duplication, but really only if you make
a separate field (which is wasteful),
> and make your custom QP lie about its field... in the examples I listed above you can
do this with a single field, yet still
> have a more exact phrase search.

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