gsmiller commented on a change in pull request #420:
URL: https://github.com/apache/lucene/pull/420#discussion_r743098739
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/TaxonomyIndexArrays.java
##########
@@ -129,39 +124,19 @@ private void initParents(IndexReader reader, int first)
throws IOException {
if (reader.maxDoc() == first) {
return;
}
-
- // it's ok to use MultiTerms because we only iterate on one posting list.
- // breaking it to loop over the leaves() only complicates code for no
- // apparent gain.
- PostingsEnum positions =
- MultiTerms.getTermPostingsEnum(
- reader, Consts.FIELD_PAYLOADS, Consts.PAYLOAD_PARENT_BYTES_REF,
PostingsEnum.PAYLOADS);
-
- // shouldn't really happen, if it does, something's wrong
- if (positions == null || positions.advance(first) ==
DocIdSetIterator.NO_MORE_DOCS) {
- throw new CorruptIndexException(
- "Missing parent data for category " + first, reader.toString());
- }
-
- int num = reader.maxDoc();
- for (int i = first; i < num; i++) {
- if (positions.docID() == i) {
- if (positions.freq() == 0) { // shouldn't happen
- throw new CorruptIndexException(
- "Missing parent data for category " + i, reader.toString());
- }
-
- parents[i] = positions.nextPosition();
-
- if (positions.nextDoc() == DocIdSetIterator.NO_MORE_DOCS) {
- if (i + 1 < num) {
- throw new CorruptIndexException(
- "Missing parent data for category " + (i + 1),
reader.toString());
- }
- break;
+ for (LeafReaderContext leafContext: reader.leaves()) {
Review comment:
The only benefit I had in mind was some code simplicity since
`MultiDocValues` handles iterating through all the leaves for us, which is what
we're doing here. But maybe there's some overhead or other downsides to using
`MultiDocValues`?
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