Function Query "map" variant that allows "target" to be an arbitrary ValueSource
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Key: SOLR-1871
URL: https://issues.apache.org/jira/browse/SOLR-1871
Project: Solr
Issue Type: Improvement
Components: search
Affects Versions: 1.4
Reporter: Chris Harris
Currently, as documented at http://wiki.apache.org/solr/FunctionQuery#map, the
"target" of a map must be a floating point constant. I propose that you should
have at least the option of doing a map where the target is an arbitrary
ValueSource.
The particular use case that inspired this is that I want to be able to control
how missing date fields affected boosting. In particular, I want to be able to
use something like this in my function queries:
{code}
map(mydatefield,0,0,ms(NOW))
{code}
But this might have other uses.
I'll attach an initial implementation.
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