gsmiller commented on a change in pull request #443:
URL: https://github.com/apache/lucene/pull/443#discussion_r751453417
##########
File path: lucene/facet/src/java/org/apache/lucene/facet/FacetsConfig.java
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@@ -409,9 +410,26 @@ private void processFacetFields(
indexDrillDownTerms(doc, indexFieldName, dimConfig, facetLabel);
}
- // Facet counts:
- // DocValues are considered stored fields:
- doc.add(new BinaryDocValuesField(indexFieldName,
dedupAndEncode(ordinals.get())));
+ // Store the taxonomy ordinals associated with each doc. Prefer to use
SortedNumericDocValues
+ // but "fall back" to a custom binary format to maintain backwards
compatibility with Lucene 8
+ // indexes.
+ if (taxoWriter.useNumericDocValuesForOrdinals()) {
+ // Dedupe and encode the ordinals. It's not important that we sort here
+ // (SortedNumericDocValuesField will handle this internally), but we
+ // sort to identify dups (since SNDVF doesn't dedupe):
+ IntsRef ords = ordinals.get();
Review comment:
Good suggestion, thanks.
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