JingsongLi commented on PR #8371:
URL: https://github.com/apache/paimon/pull/8371#issuecomment-5132475273
- Flink’s `SortedIndexTopoBuilder` uses signed bytes to sort the encoded
keys, but `ReversedKeySerializer` uses unsigned bytes for comparison.
- Non-ASCII characters in UTF-8 result in reverse order, such as `a` and
`é`.
- This may cause the `BTreeIndexWriter`’s monotonicity check to fail or
generate a reverse B-tree with incorrect ordering.
- Existing tests only cover ASCII characters; it is recommended to add
tests for non-ASCII keys and use a comparator consistent with the serializer.
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