@Override public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { final int off = readerContext.docBase; final LeafReader r; Object o = context.get("searcher"); if (o instanceof SolrIndexSearcher) { SolrIndexSearcher is = (SolrIndexSearcher) o; SchemaField sf = is.getSchema().getFieldOrNull(field); if (sf != null && sf.hasDocValues() == false && sf.multiValued() == false && sf.getType().getNumericType() != null) { // it's a single-valued numeric field: we must currently create insanity :( List<LeafReaderContext> leaves = is.getIndexReader().leaves(); LeafReader insaneLeaves[] = new LeafReader[leaves.size()]; int upto = 0; for (LeafReaderContext raw : leaves) { insaneLeaves[upto++] = Insanity.wrapInsanity(raw.reader(), field); } r = SlowCompositeReaderWrapper.wrap(new MultiReader(insaneLeaves)); } else { // reuse ordinalmap r = ((SolrIndexSearcher) o).getLeafReader(); } } else { IndexReader topReader = ReaderUtil.getTopLevelContext(readerContext).reader(); r = SlowCompositeReaderWrapper.wrap(topReader); } // if it's e.g. tokenized/multivalued, emulate old behavior of single-valued fc final SortedDocValues sindex = SortedSetSelector.wrap(DocValues.getSortedSet(r, field), SortedSetSelector.Type.MIN); final int end = sindex.getValueCount(); return new IntDocValues(this) { @Override public int intVal(int doc) { return (end - sindex.getOrd(doc + off) - 1); } }; }