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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (SOLR-2202) Money FieldType
Date Wed, 27 Oct 2010 11:59:19 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925340#action_12925340
] 

Uwe Schindler edited comment on SOLR-2202 at 10/27/10 7:58 AM:
---------------------------------------------------------------

The other question is, why you don't use NumericField (in Solr it's the TrieField type) and
instead save the stuff as plain numbers in index?

In general its wrong to use float/double as currency-backing type, as you have rounding problems.
To index/store the fields in lucene/solr or any database, you have to use fixed point. E.g.
a TrieField instance saing the "US-Cent" value.

This would enable Range Queries without the field cache!

      was (Author: thetaphi):
    The other question is, why you don't use NumericField and instead save the stuff as plain
numbers in index? This would enable Range Queries without the field cache!
  
> Money FieldType
> ---------------
>
>                 Key: SOLR-2202
>                 URL: https://issues.apache.org/jira/browse/SOLR-2202
>             Project: Solr
>          Issue Type: New Feature
>          Components: Schema and Analysis
>    Affects Versions: 1.5
>            Reporter: Greg Fodor
>         Attachments: SOLR-2202-lucene-1.patch, SOLR-2202-solr-1.patch, SOLR-2202-solr-2.patch
>
>
> Attached please find patches to add support for monetary values to Solr/Lucene with query-time
currency conversion. The following features are supported:
> - Point queries (ex: "price:4.00USD")
> - Range quries (ex: "price:[$5.00 TO $10.00]")
> - Sorting.
> - Currency parsing by either currency code or symbol.
> - Symmetric & Asymmetric exchange rates. (Asymmetric exchange rates are useful if
there are fees associated with exchanging the currency.)
> At indexing time, money fields can be indexed in a native currency. For example, if a
product on an e-commerce site is listed in Euros, indexing the price field as "10.00EUR" will
index it appropriately. By altering the currency.xml file, the sorting and querying against
Solr can take into account fluctuations in currency exchange rates without having to re-index
the documents.
> The new "money" field type is a polyfield which indexes two fields, one which contains
the amount of the value and another which contains the currency code or symbol. The currency
metadata (names, symbols, codes, and exchange rates) are expected to be in an xml file which
is pointed to by the field type declaration in the schema.xml.
> The current patch is factored such that Money utility functions and configuration metadata
lie in Lucene (see MoneyUtil and CurrencyConfig), while the MoneyType and MoneyValueSource
lie in Solr. This was meant to mirror the work being done on the spacial field types.
> This patch has not yet been deployed to production but will be getting used to power
the international search capabilities of the search engine at Etsy.

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