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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/12 10:51:29 UTC

[GitHub] [arrow-datafusion] tustvold edited a comment on pull request #1990: WIP: Finer-grained parallelism for Parquet Scan

tustvold edited a comment on pull request #1990:
URL: https://github.com/apache/arrow-datafusion/pull/1990#issuecomment-1065860904


   I'm not sure I follow how this will work, parquet files have a block structure internally that is not amenable to seeking. Particularly with RLE data, it is common for a column chunk to consist of a single page. Could you maybe expand a bit on this?
   
   On a more holistic level, is there some prior art on parellelising parquet reads, I've only ever encountered file and rarely row group parallelism...


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