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https://issues.apache.org/jira/browse/SOLR-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925344#action_12925344
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Robert Muir commented on SOLR-2202:
-----------------------------------
bq. Here some infos, why it's wrong to use double/float:
http://download.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
Also, you can use
[Currency.getDefaultFractionDigits|http://download.oracle.com/javase/1.5.0/docs/api/java/util/Currency.html#getDefaultFractionDigits()]
to fix this.
For example, the default number of fraction digits for the Euro is 2, while for
the Japanese Yen it's 0. In the case of pseudo-currencies, such as IMF Special
Drawing Rights, -1 is returned.
> 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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