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
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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