gsmiller commented on a change in pull request #443:
URL: https://github.com/apache/lucene/pull/443#discussion_r751451039
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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
Review comment:
Did a little digging and it appears the sorting is done using
`Arrays.sort` (from
[here](https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/index/SortedNumericDocValuesWriter.java#L75)),
which is a flavor of quicksort. I'm not deeply familiar with the current
sorting implementation but from a quick glance, it looks to me like it's trying
to be efficient for already-sorted cases. If anyone knows better, I'd be
curious to learn more (just haven't had time to dive really deep on this).
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