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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/06/06 09:54:11 UTC

[GitHub] [arrow-rs] pacman82 commented on pull request #1774: Access metadata of flushed row groups on write (#1691)

pacman82 commented on PR #1774:
URL: https://github.com/apache/arrow-rs/pull/1774#issuecomment-1147269547

   @tustvold For now getting the `compressed_size` of each row group after I've written it, did the trick for me. End to end my usecase is about creating files of roughly the same size, while streaming data from a database. My current solution is like this:
   
   1. Accumulate the compressed size of each row group written
   2. If sum of compressed size goes over a threshold, reset to zero and start writing the next row group into a new file.
   
   Maybe this interface would help me simplify things? Or is there a way to be more "precise" in the resulting file size. Anyhow I do not see it at the moment.
   
   Cheers, Markus


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