zeevm commented on PR #3872:
URL: https://github.com/apache/arrow-rs/pull/3872#issuecomment-1553234993

   I am using RleDecoder of course to decode the RLE into dictionary IDs.
   
   I am using LevelDecoder for 2 things:
   1. Get the definition levels (so I know which positions are null or defined)
   2. Find the position within the ByteBufferPtr where the RLE encoded values 
start to feed into the RLE decoder in V1 pages since those pages don't have the 
size of the definition/repetition levels in the page header


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