pmpailis commented on issue #15324:
URL: https://github.com/apache/lucene/issues/15324#issuecomment-3443273632
A few more observations on the issue:
* We seem to also trip the assertion in
`Lucene101PostingsReader.BlockPostingsEnum#accumulatePendingPositions`
```java
assert posPendingCount > 0;
```
when handling `UNARY` encoding.
* The original error originates when
`Lucene101PostingsReader.BlockPostingsEnum#docID` returns `NO_MORE_DOCS`.
Tracking this back, it seems that we try to access the `NO_MORE_DOCS` entry in
`Lucene101PostingsReader.BlockPostingsEnum#docBuffer`, which AFAICT is set in
`Lucene101PostingsReader.BlockPostingsEnum#refillRemainder` . Seems like we
have exhausted the iterator, yet still we try to access and load postings.
Still looking into this, whilst also trying to generate a reproducible test
scenario.
Also, FWIW this is also reproducible in 10.2.2.
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