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Optimize parquet chunk downloading strategy #10

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rdettai opened this issue Jan 22, 2021 · 0 comments
Open

Optimize parquet chunk downloading strategy #10

rdettai opened this issue Jan 22, 2021 · 0 comments
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enhancement New feature or request

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@rdettai
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rdettai commented Jan 22, 2021

The parquet table downloads each column chunk individually. If a large proportion of the columns are used and there is a large number of row groups in the file, this implies many small downloads.

A strategy could be implemented to group the downloads of column chunks if

  • they are close
  • download parallelism is already high enough (having multiple downloads in parallel increases the total bandwidth)
@rdettai rdettai added the enhancement New feature or request label Jan 22, 2021
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