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From "Uwe Schindler (JIRA)" <>
Subject [jira] [Commented] (LUCENE-1768) NumericRange support for new query parser
Date Sat, 06 Aug 2011 05:57:27 GMT


Uwe Schindler commented on LUCENE-1768:

bq. I see some classes in Lucene use Version, but I don't know exactly how that works and
why standard query parser do not use it. Should it?

Version is inteneded to be used for behavioural changes to keep index compatibility, so people
can use new Lucene versions without reindexing. It does not help for API changes (it could
sometimes, but only for those cases where the API changes are something like: If versionA
call method a else method b) if method a or b trigger different APIs.

Typical examples for Version are changes in tokenization (so most analyzers use it): When
a bugfix in the analyzer produces different tokens than before the version flag is used to
be able to enable the "buggy" behaviour, so querying your index with the "wrong" tokens still
works. The core queryparser also uses it to change the behaviour of creating phrase queries
(the flexible query parser is, as far as I know, still missing this).

I am away this weekend, I will come back to you on Monday for the other questions.

> NumericRange support for new query parser
> -----------------------------------------
>                 Key: LUCENE-1768
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: core/queryparser
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>              Labels: contrib, gsoc, gsoc2011, lucene-gsoc-11, mentor
>             Fix For: 4.0
>         Attachments: TestNumericQueryParser-fix.patch, TestNumericQueryParser-fix.patch,
TestNumericQueryParser-fix.patch, TestNumericQueryParser-fix.patch, week-7.patch, week-8.patch,
week1.patch, week2.patch, week3.patch, week4.patch, week5-6.patch
> It would be good to specify some type of "schema" for the query parser in future, to
automatically create NumericRangeQuery for different numeric types? It would then be possible
to index a numeric value (double,float,long,int) using NumericField and then the query parser
knows, which type of field this is and so it correctly creates a NumericRangeQuery for strings
like "[1.567..*]" or "(1.787..19.5]".
> There is currently no way to extract if a field is numeric from the index, so the user
will have to configure the FieldConfig objects in the ConfigHandler. But if this is done,
it will not be that difficult to implement the rest.
> The only difference between the current handling of RangeQuery is then the instantiation
of the correct Query type and conversion of the entered numeric values (simple Number.valueOf(...)
cast of the user entered numbers). Evenerything else is identical, NumericRangeQuery also
supports the MTQ rewrite modes (as it is a MTQ).
> Another thing is a change in Date semantics. There are some strange flags in the current
parser that tells it how to handle dates.

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