vs.createWeight(context, sqr.getSearcher());
SolrIndexReader sr = sqr.getSearcher().getReader();
int idx = SolrIndexReader.readerIndex(doc, sr.getLeafOffsets());
int base = sr.getLeafOffsets()[idx];
SolrIndexReader sub = sr.getLeafReaders()[idx];
DocValues vals = vs.getValues(context, sub);
return vals.strVal(doc-base);
}