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https://issues.apache.org/jira/browse/SOLR-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925514#action_12925514
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Greg Fodor commented on SOLR-2202:
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Ok, great, thanks Uwe. I will make a pass to incorporate the changes noted here:

- Indexing tlong instead of double
- Construct range query efficiently based upon maximal/minimal conversion rate
- Remove locale specific logic, standardize on input format being <long 
value>,<ISO code>

Note that coercion to double's will still occur during the actual conversion, 
but they will be immediately coerced back into long's.

> 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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