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Posted to github@arrow.apache.org by "R-JunmingChen (via GitHub)" <gi...@apache.org> on 2023/07/04 15:02:26 UTC

[GitHub] [arrow] R-JunmingChen commented on issue #35268: [C++] OrderBy with spillover

R-JunmingChen commented on issue #35268:
URL: https://github.com/apache/arrow/issues/35268#issuecomment-1620411919

   > Yes. But, luckily, in this case the functions should already exist: https://gist.github.com/westonpace/a45738e5a356324d410cba2c2713b1fd
   
   No, the compare Functions currently don't support comparing between single elements in array. Like  `a_array->data()->GetValues<CType>(a_indice) > b_array->data()-><Ctype>GetValues(b_indice)`. These Function can be used to compare two array entirely. But merge sort only need to compare the min/max keys between different arrays, comparing the entire arrays is too costly.
   
   


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