jpountz commented on code in PR #12829:
URL: https://github.com/apache/lucene/pull/12829#discussion_r1419268112
##########
lucene/core/src/java/org/apache/lucene/index/IndexingChain.java:
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@@ -219,15 +222,33 @@ private Sorter.DocMap maybeSortSegment(SegmentWriteState
state) throws IOExcepti
}
LeafReader docValuesReader = getDocValuesLeafReader();
-
+ Function<IndexSorter.DocComparator, IndexSorter.DocComparator>
comparatorWrapper = in -> in;
+
+ if (state.segmentInfo.getHasBlocks() && indexSort.getParentField() !=
null) {
+ final DocIdSetIterator readerValues =
+ docValuesReader.getNumericDocValues(indexSort.getParentField());
+ BitSet parents = BitSet.of(readerValues, state.segmentInfo.maxDoc());
+ comparatorWrapper =
+ in ->
+ (docID1, docID2) ->
+ in.compare(parents.nextSetBit(docID1),
parents.nextSetBit(docID2));
+ }
+ assert state.segmentInfo.getHasBlocks() == false
+ || indexSort.getParentField() != null
+ || indexCreatedVersionMajor < Version.LUCENE_10_0_0.major
+ : "parent field is not set but the index has blocks.
indexCreatedVersionMajor: "
+ + indexCreatedVersionMajor;
List<IndexSorter.DocComparator> comparators = new ArrayList<>();
for (int i = 0; i < indexSort.getSort().length; i++) {
SortField sortField = indexSort.getSort()[i];
IndexSorter sorter = sortField.getIndexSorter();
if (sorter == null) {
throw new UnsupportedOperationException("Cannot sort index using sort
field " + sortField);
}
- comparators.add(sorter.getDocComparator(docValuesReader,
state.segmentInfo.maxDoc()));
+
+ IndexSorter.DocComparator docComparator =
Review Comment:
It's been a long time so I don't know if/where this is tested, I just know
that we need stability for other reasons, e.g. to preserve some merging
optimizations by having runs of doc IDs that come from the same segment that
are as long as possible.
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