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From "Luis Alves (JIRA)" <>
Subject [jira] Commented: (LUCENE-1768) NumericRange support for new query parser
Date Fri, 14 Aug 2009 18:15:14 GMT


Luis Alves commented on LUCENE-1768:

I would propose to absorb the RangeTools/Utils and DateTools/Utils (ehat is the correct name???)
in one configuration class 

I am not sure how to do this with the new parser. I think of the same like the MTQRewriteMethod
(final static singletons in MTQ that do the rewrite and can be passed as parameter). 

I think we probably should have TermRangeQueryNode a NumericQueryNode and 2 builders classes
that match that, change ParametricRangeQueryNodeProcessor to do the dirty work and create
the new TermRangeQueryNode and NumericQueryNode in the correct places, based on the a map
with [field name,RangeTools.TYPE] or something similar.
The builders should simple and just convert each type to the correct Lucene Object.

- we should rename RangeQueryNode to TermRangeQueryNode (to match lucene name)
- create the new NumericQueryNode that extends from TermRangeQueryNode
- change the ParametricRangeQueryNodeProcessor to read the configuration passed by the user
and create the correct QueryNode objects.
- create a new NumericQueryNodeBuilder add it to the StandardQueryTreeBuilder mapping.

I hope this helps

> NumericRange support for new query parser
> -----------------------------------------
>                 Key: LUCENE-1768
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: QueryParser
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 2.9
> 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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