[GitHub] [arrow] kou commented on issue #34781: [Ruby] Query a parquet file on S3 without downloading it (using byte ranges)

["kou (via GitHub)" <gi...@apache.org>]

kou commented on issue #34781:
URL: https://github.com/apache/arrow/issues/34781#issuecomment-1499781524

   Sorry, I missed this.
   
   We can't use byte ranges directly but we can use condition push down to reduce download size.
   
   We doesn't provide DSL to build condition yet (#29928) but the following will work:
   
   ```ruby
   require 'arrow-dataset'
   
   s3_uri = URI('s3://bucket/public.parquet')
   Arrow::Table.load(s3_uri, filter: [:equal, :column_name, 100]) # "column_name == 100"
   ```
   
   See https://arrow.apache.org/docs/cpp/compute.html for available functions.


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