asfimport commented on issue #405:
URL: https://github.com/apache/parquet-format/issues/405#issuecomment-2184154129

   [Raphael 
Taylor-Davies](https://issues.apache.org/jira/browse/PARQUET-2222?#comment-17731001)
 / @tustvold:
   Within arrow-rs levels data is always written using RLE, only prepending the 
length for v1 data pages. We also support reading bit backed level data but we 
never write it.
   
   We additionally support reading/writing boolean data using RLE, this is the 
default for writer version 2, but theoretically a v1 writer could opt-in to 
this. This will always prepend the length when flushing a data page.
   
   Finally for dictionary indices we do not prepend the length
   
   Not sure if that answers your question


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