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StreamStringTermsAggregator explicitly asserts single leaf #19416

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Merged
merged 9 commits into from
Oct 7, 2025
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Merged

StreamStringTermsAggregator explicitly asserts single leaf #19416

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9b1eb64
Asserting single segment in StreamStringTermsAggregator
mkhludnev Sep 25, 2025
10130e0
Asserting single segment in StreamStringTermsAggregator
mkhludnev Sep 25, 2025
afdbdaf
Merge branch 'main' into stream-agg-assert-single-list
mkhludnev Oct 2, 2025
734cba7
adding test collecting per-segment aggs and reducing them to get over…
mkhludnev Oct 3, 2025
fab4553
Merge branch 'main' into stream-agg-assert-single-list
mkhludnev Oct 3, 2025
6347a4a
set flush mode per segment
mkhludnev Oct 4, 2025
0f84b06
propagate reset() through profiler.
mkhludnev Oct 5, 2025
3c0350f
add CHANGELOG.md
mkhludnev Oct 6, 2025
3969e52
join CHANGELOG.md line
mkhludnev Oct 6, 2025
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7 changes: 7 additions & 0 deletions ...ain/java/org/opensearch/search/aggregations/bucket/terms/StreamStringTermsAggregator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@ public class StreamStringTermsAggregator extends AbstractStringTermsAggregator {
protected int segmentsWithSingleValuedOrds = 0;
protected int segmentsWithMultiValuedOrds = 0;
protected final ResultStrategy<?, ?, ?> resultStrategy;
private boolean madeLeafOnce = false;

public StreamStringTermsAggregator(
String name,
Expand All @@ -72,6 +73,7 @@ public void doReset() {
super.doReset();
valueCount = 0;
sortedDocValuesPerBatch = null;
this.madeLeafOnce = false;
}

@Override
Expand All @@ -91,6 +93,11 @@ public InternalAggregation buildEmptyAggregation() {

@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx, LeafBucketCollector sub) throws IOException {
if (this.madeLeafOnce) {
throw new IllegalStateException("pardon you might already collected " + docCounts);
} else {
this.madeLeafOnce = true;
}
this.sortedDocValuesPerBatch = valuesSource.ordinalsValues(ctx);
this.valueCount = sortedDocValuesPerBatch.getValueCount(); // for streaming case, the value count is reset to per batch
// cardinality
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7 changes: 5 additions & 2 deletions ...ava/org/opensearch/search/aggregations/bucket/terms/StreamStringTermsAggregatorTests.java
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Expand Up @@ -344,6 +344,9 @@ public void testBuildAggregationsBatchReset() throws Exception {
Document document = new Document();
document.add(new SortedSetDocValuesField("field", new BytesRef("test")));
indexWriter.addDocument(document);
document = new Document();
document.add(new SortedSetDocValuesField("field", new BytesRef("best")));
indexWriter.addDocument(document);

try (IndexReader indexReader = maybeWrapReaderEs(indexWriter.getReader())) {
IndexSearcher indexSearcher = newIndexSearcher(indexReader);
Expand All @@ -369,7 +372,7 @@ public void testBuildAggregationsBatchReset() throws Exception {
aggregator.postCollection();

StringTerms firstResult = (StringTerms) aggregator.buildAggregations(new long[] { 0 })[0];
assertThat(firstResult.getBuckets().size(), equalTo(1));
assertThat(firstResult.getBuckets().size(), equalTo(2));

aggregator.doReset();

Expand All @@ -379,7 +382,7 @@ public void testBuildAggregationsBatchReset() throws Exception {
aggregator.postCollection();

StringTerms secondResult = (StringTerms) aggregator.buildAggregations(new long[] { 0 })[0];
assertThat(secondResult.getBuckets().size(), equalTo(1));
assertThat(secondResult.getBuckets().size(), equalTo(2));
assertThat(secondResult.getBuckets().get(0).getDocCount(), equalTo(1L));
}
}
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