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From "Itamar Syn-Hershko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6302) Adding Date Math support to Lucene Expressions module
Date Thu, 26 Feb 2015 16:45:04 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14338677#comment-14338677
] 

Itamar Syn-Hershko commented on LUCENE-6302:
--------------------------------------------

Sent a PR for the latter https://github.com/apache/lucene-solr/pull/129

> Adding Date Math support to Lucene Expressions module
> -----------------------------------------------------
>
>                 Key: LUCENE-6302
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6302
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/expressions
>    Affects Versions: 4.10.3
>            Reporter: Itamar Syn-Hershko
>
> Lucene Expressions are great, but they don't allow for date math. More specifically,
they don't allow to infer date parts from a numeric representation of a date stamp, nor they
allow to parse strings representations to dates.
> Some of the features requested here easy to implement via ValueSource implementation
(and potentially minor changes to the lexer definition) , some are more involved. I'll be
happy if we could get half of those in, and will be happy to work on a PR for the parts we
can agree on.
> The items we will be happy to have:
> - A now() function (with or without TZ support) to return a current long date/time value
as numeric, that we could use against indexed datetime fields (which are infact numerics)
> - Parsing methods - to allow to express datetime as strings, and / or read it from stored
fields and parse it from there. Parse errors would render a value of zero.
> - Given a numeric value, allow to specify it is a date value and then infer date parts
- e.g. Date(1424963520).Year == 2015, or Date(now()) - Date(1424963520).Year. Basically methods
which return numerics but internally create and use Date objects.



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