wjones127 commented on PR #34668:
URL: https://github.com/apache/arrow/pull/34668#issuecomment-1480212638

   So I found that the DeltaBitPackDecoder will error if the header is missing, 
so I think it makes sense for us to also error if it's missing at the beginning 
of DeltaLengthByteArray. To accomplish this, I actually deleted the branch, so 
it can get to the `DecodeLengths()` which already handles this error:
    
https://github.com/wjones127/arrow/blob/f59fe0a2267b12069586e7c6b0351c48bf296371/cpp/src/parquet/encoding.cc#L2424


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