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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1768) NumericRange support for new query parser
Date Sat, 08 Aug 2009 09:46:14 GMT


Michael McCandless commented on LUCENE-1768:

Given the complexity of customizing the new QueryParser, and given
that numeric fields will likely be commonly used, I think this is an
important issue.  I think we should try to have the new QueryParser
cleanly produce NumericRangeQuery, in 2.9.

EG expecting a user to do "option 1" (the "clean", more flexible
option) is a tall order.  Simple things should be simple...

The proposed RangeTools seems like a good approach, and I like how it
cleanly absorbs the Date precisions that the old queryParser also

But we better get cracking here since 2.9 is real close....!

Here's one side-question, about back compat promises for the new
QueryParser: we are suggesting the users can start from all the
building blocks in StandardQueryParser, and override the processors,
create new nodes, builders, etc. with their own.  But this is
potentially dangerous, in that the next version of Lucene might change
things up such that your custom code doesn't work anymore?  It's alot
like a core class being subclassed externally, and then change to the
core class break those external subclasses.

EG say we had not handled numerics for 2.9, and users go and do
"option 2" (the quick & dirty, but simplest, way to get
NumericRangeQueries out).  Then, say in 3.1 we implement the proposed
fix here ("option 1").  Suddenly, we've altered what nodes come out of
the processor pipeline, because we've created a new NumericRangeQuery
node, and so the builders that users had added, for the RangeQuery
node, will no loner be invoked.  How are we going to handle
back-compat here?

> 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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