lesterfan opened a new issue, #46094: URL: https://github.com/apache/arrow/issues/46094
### Describe the bug, including details regarding any error messages, version, and platform. On the current main branch, the [specified behavior](https://github.com/apache/arrow/blob/409a016e5fdfa28cabd580b7ec81c42991c0748e/cpp/src/arrow/util/rle_encoding_internal.h#L114) of `arrow::util::RleDecoder::Get` is to return false if there are no more elements. However, this behavior doesn't work for some bit widths. This failing test case illustrates this: https://github.com/lesterfan/arrow/commit/27220552f7333907c3e1c2bd536e3303736f1cc1. I added some logging to the above test case for the original/decoded vector values and lengths below. The `RleDecoder` seems to be reading some additional values at the end of the buffer for this particular case with `bit_width = 17`. ``` Note: Google Test filter = *Rle.DecoderGetBitWidthRoundTrip* [==========] Running 1 test from 1 test suite. [----------] Global test environment set-up. [----------] 1 test from Rle [ RUN ] Rle.DecoderGetBitWidthRoundTrip values.size(): 100 values: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, decoded_values.size(): 104 decoded_values: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 15794567, 15794567, 15794567, 15794567, /Users/lester/work/arrow/cpp/src/arrow/util/rle_encoding_test.cc:383: Failure Expected equality of these values: values Which is: { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ... } decoded_values Which is: { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ... } [ FAILED ] Rle.DecoderGetBitWidthRoundTrip (0 ms) [----------] 1 test from Rle (0 ms total) [----------] Global test environment tear-down [==========] 1 test from 1 test suite ran. (0 ms total) [ PASSED ] 0 tests. [ FAILED ] 1 test, listed below: [ FAILED ] Rle.DecoderGetBitWidthRoundTrip ``` ### Component(s) Parquet -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
