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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/10/26 08:17:55 UTC

[GitHub] [arrow] rdettai commented on pull request #8525: ARROW-10387: [Rust][Parquet] Avoid call for file size metadata to read footer

rdettai commented on pull request #8525:
URL: https://github.com/apache/arrow/pull/8525#issuecomment-716388352


   @alamb has raised doubts in https://github.com/apache/arrow/pull/8300 about the necessity for this as the file size could be known from an other source (list operation or metadata catalog). I still want to propose this for discussion as I believe it is more flexible than the current interface. 
   
   There is one catch I encountered though when implementing the S3 source: the http range header (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range) allows you to read from end, but not from end with a given offset. So implementing the ChunkReader as it is specified here forces you to query more bytes than required (up until the end) and stop reading the stream once you have the data you need.


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