mikemccand commented on a change in pull request #220:
URL: https://github.com/apache/lucene/pull/220#discussion_r676902852
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyWriter.java
##########
@@ -475,8 +476,20 @@ private int addCategoryDocument(FacetLabel categoryPath,
int parent) throws IOEx
String fieldPath = FacetsConfig.pathToString(categoryPath.components,
categoryPath.length);
fullPathField.setStringValue(fieldPath);
+
+ boolean commitExists =
indexWriter.getLiveCommitData().iterator().hasNext();
+ /* no commits so this is a fresh index, or the old index was built using a
Lucene 9 or greater version */
+ if ((commitExists == false)
+ || (SegmentInfos.readLatestCommit(dir)
Review comment:
This is a horrifyingly costly check to do for every added `FacetLabel`!
Couldn't we do this check once in ctor when this `TaxonomyWriter` is created,
and store the result in a `final boolean`?
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyWriter.java
##########
@@ -475,8 +476,20 @@ private int addCategoryDocument(FacetLabel categoryPath,
int parent) throws IOEx
String fieldPath = FacetsConfig.pathToString(categoryPath.components,
categoryPath.length);
fullPathField.setStringValue(fieldPath);
+
+ boolean commitExists =
indexWriter.getLiveCommitData().iterator().hasNext();
+ /* no commits so this is a fresh index, or the old index was built using a
Lucene 9 or greater version */
+ if ((commitExists == false)
+ || (SegmentInfos.readLatestCommit(dir)
+ .getMinSegmentLuceneVersion()
+ .onOrAfter(Version.LUCENE_9_0_0))) {
+ /* Lucene 9 introduces BinaryDocValuesField for storing taxonomy
categories */
Review comment:
Maybe `switches to` instead of `introduces`?
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