[GitHub] [arrow] lidavidm commented on pull request #10060: ARROW-9697: [C++][Python][R][Dataset] Add CountRows for Scanner

[GitBox <gi...@apache.org>]

lidavidm commented on pull request #10060:
URL: https://github.com/apache/arrow/pull/10060#issuecomment-820684070


   R Benchmark PR (because R had a special case for this before): https://github.com/ursacomputing/arrowbench/pull/24
   Note I still need to plumb that through into Conbench.
   
   Results:
   ```
   Before:
       process      real start_mem_bytes end_mem_bytes max_mem_bytes gc_level0 gc_level1 gc_level2
   1 0.4612792 0.4754918      2669531136    8582832128   24671309824         2         0         0
   
   After:
      process     real start_mem_bytes end_mem_bytes max_mem_bytes gc_level0 gc_level1 gc_level2
   1 1.571199 0.204026      2480492544    3325677568    3325677568         0         0         0
   ```


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