tustvold opened a new issue, #4321:
URL: https://github.com/apache/arrow-rs/issues/4321

   **Describe the bug**
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   `PageReader::peek_next_page` for `SerializedPageReader` and 
`InMemoryPageReader` returns num_values for DataPageV1. This is not the row 
count, and is instead the number of levels. For a column with repetition 
levels, this will therefore be incorrect.
   
   This in turn will cause the skipping logic to misbehave
   
   **To Reproduce**
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   **Expected behavior**
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   **Additional context**
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