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https://issues.apache.org/jira/browse/SOLR-2136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley updated SOLR-2136:
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Attachment: SOLR-2136.patch
Here's an update with tests that builds out more boolean support, including
true/false constants. This also adds xor() and def() functions.
def is short for default and yields the first value where exists()==true. Thus
def(myfield, 1.0) is equivalent to if(exists(myfield),myfield,1.0)
I think this is ready to commit!
> Function Queries: if() function
> -------------------------------
>
> Key: SOLR-2136
> URL: https://issues.apache.org/jira/browse/SOLR-2136
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.4.1
> Reporter: Jan Høydahl
> Attachments: SOLR-2136.patch, SOLR-2136.patch
>
>
> Add an if() function which will enable conditional function queries.
> The function could be modeled after a spreadsheet if function (e.g:
> http://wiki.services.openoffice.org/wiki/Documentation/How_Tos/Calc:_IF_function)
> IF(test; value1; value2) where:
> test is or refers to a logical value or expression that returns a logical
> value (TRUE or FALSE).
> value1 is the value that is returned by the function if test yields TRUE.
> value2 is the value that is returned by the function if test yields FALSE.
> If value2 is omitted it is assumed to be FALSE; if value1 is also omitted it
> is assumed to be TRUE.
> Example use:
> if(color=="red"; 100; if(color=="green"; 50; 25))
> This function will check the document field "color", and if it is "red"
> return 100, if it is "green" return 50, else return 25.
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