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From "Adriano Crestani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-1768) NumericRange support for new query parser
Date Wed, 06 Jul 2011 17:31:18 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060707#comment-13060707
] 

Adriano Crestani commented on LUCENE-1768:
------------------------------------------

{quote}
For numeric fields, half open ranges are important, as it supports queries like "price <
2.00 Dollar". Wasn't there not also an issue open to support other syntax for numerics like
> and < operators?
{quote}

Yes, there is, just do not recall the JIRA number now. Maybe Vinicius could try to implement
it as well to fill out his task list in case he finishes his tasks before schedule, since
it is also related to numeric queries. I am just not sure how much complex the task would
be, I know the big change for this is in the syntax parser, which will require to know how
to change javacc files.

> NumericRange support for new query parser
> -----------------------------------------
>
>                 Key: LUCENE-1768
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1768
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: core/queryparser
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Adriano Crestani
>              Labels: contrib, gsoc, gsoc2011, lucene-gsoc-11, mentor
>             Fix For: 4.0
>
>         Attachments: 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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