Improve API of ValueSource & FunctionQuery SortField weighting
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Key: SOLR-2533
URL: https://issues.apache.org/jira/browse/SOLR-2533
Project: Solr
Issue Type: Improvement
Components: search
Reporter: Chris Male
Started from LUCENE-2883: Support for sorting by ValueSource and
FunctionQueries is done through ValueSource#getSort and the
ValueSourceSortField. In order to support VSs containing other Queries, its
necessary to allow the Querys to be weighted by an IndexSearcher. Currently
this is handled by having ValueSourceSortField implement SolrSortField. In
Solr's SolrIndexSearcher, SortFields implementing SolrSortField are then
weighted before the Sort is used.
Sorting by FunctionQuery and ValueSource are invaluable and will become
available to all Lucene users in LUCENE-2883. But in order to do so, we need
to remove the coupling of this functionality to Solr, and make it more standard.
Any and all thoughts about how to do this are appreciated.
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