wesm opened a new pull request #7779:
URL: https://github.com/apache/arrow/pull/7779


   I wasn't sure about the best way to fix this, but the root cause was bad 
data returned by `RleDecoder`. It seems that even with `bit_width_` is 1 that 
this class can return values greater than 1. We might have a closer look at 
that. I also opened ARROW-9498 about seeing if we want to make an improvement 
to the implementation given improvements made in Impala (where this code 
originated)


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