[GitHub] [arrow] paleolimbot commented on pull request #13635: ARROW-11841: [R][C++] Allow cancelling long-running commands

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

paleolimbot commented on PR #13635:
URL: https://github.com/apache/arrow/pull/13635#issuecomment-1187641603

   I don't think this works yet, or at least it doesn't reduce the amount of time it takes to read a big CSV. I'm using this as my reprex to test. I don't understand a lot about the content of this PR so feel free to change everything about it!
   
   ``` r
   library(arrow, warn.conflicts = FALSE)
   #> Some features are not enabled in this build of Arrow. Run `arrow_info()` for more information.
   
   tf <- tempfile()
   readr::write_csv(vctrs::vec_rep(mtcars, 5e5), tf)
   
   # try to slow down CSV reading
   set_cpu_count(1)
   set_io_thread_count(2)
   
   # hit Control-C while this line runs!
   system.time(read_csv_arrow(tf))
   #>    user  system elapsed 
   #>   2.785   0.337   3.220
   ```
   
   <sup>Created on 2022-07-18 by the [reprex package](https://reprex.tidyverse.org) (v2.0.1)</sup>
   
   I think the overriding calling handler is being called, or at least I can do stuff there that causes R to crash (but breakpoints and printing don't seem to work here, maybe because of the interrupt?).


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