msokolov commented on a change in pull request #172:
URL: https://github.com/apache/lucene/pull/172#discussion_r646529427
##########
File path: lucene/core/src/java/org/apache/lucene/codecs/VectorWriter.java
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@@ -104,9 +104,12 @@ private void mergeVectors(FieldInfo mergeFieldInfo, final
MergeState mergeState)
}
}
}
- // Create a new VectorValues by iterating over the sub vectors, mapping
the resulting
- // docids using docMaps in the mergeState.
- if (subs.size() > 0) {
+ if (subs.size() == 0) {
+ // all segments being merged have no vectors
+ writeField(mergeFieldInfo, VectorValues.EMPTY);
+ } else {
+ // Create a new VectorValues by iterating over the sub vectors, mapping
the resulting
+ // docids using docMaps in the mergeState.
writeField(mergeFieldInfo, new VectorValuesMerger(subs, mergeState));
}
Review comment:
Hm, no, it throws an NPE in DocIDMerger.next(); if you create a
DocIDMerger with an empty List and then call next(), you get an NPE.
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