msokolov commented on code in PR #12829:
URL: https://github.com/apache/lucene/pull/12829#discussion_r1421566628
##########
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:
This is a little late here, and I don't want to derail things, but I thought
I would mention another plan that someone on our team worked up and never
shared, which is a custom comparator that accepts a parent bitset-supplier and
uses that to supply sort values for the child documents from the parent
documents. This opens the possibility of defining the parents externally,
possibly using a Query, rather than relying on an explicit indexed field.
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