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https://issues.apache.org/jira/browse/LUCENE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adriano Crestani updated LUCENE-1938:
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Attachment: LUCENE-1938.patch
This patch contains a Precedence query parser. It's basically an extension of
the current Standard query parser, but enables the boolean precedence.
The patch also contains the test cases from the current PrecedenceQueryParser,
currently located under contrib/misc. Everything passes fine, except a test
that tests if the query <A B C> is the same as <A OR B C>, when the default
operator is OR. The problem is that this new PQP does not flat/optimize the
boolean tree when the boolean operator is the same. It can be performed later,
but for now it does not implement this kind of optimization.
Another issue is that I created a class under contrib/queryparser called
PrecedenceQueryParser within the same package declaration the PQP from
contrib/misc is right now. Is that a big issue? Couldn't the old PQP be removed
and we start using this one, so we have no class conflict.
The greatest advantage of this implementation is that it basically reuses all
the StandardQueryParser functiontalities and syntax, and any modification on
the StandardQP will be automatically applied to the PrecedenceQP. No need to
maintain 2 different implementations with the same code, as the old PQP does
today.
> Precedence query parser using the contrib/queryparser framework
> ---------------------------------------------------------------
>
> Key: LUCENE-1938
> URL: https://issues.apache.org/jira/browse/LUCENE-1938
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/*
> Affects Versions: 2.9
> Reporter: Adriano Crestani
> Assignee: Adriano Crestani
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-1938.patch
>
>
> Extend the current StandardQueryParser on contrib so it supports boolean
> precedence
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