Itamar Syn-Hershko created LUCENE-6302:
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Summary: 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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