Re: [I] [R][C++] Undefined behaviour (clang sanitizer) in decompression [arrow]

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

paleolimbot commented on issue #38479:
URL: https://github.com/apache/arrow/issues/38479#issuecomment-1804583542

   The offending code is basically:
   
   ``` r
   library(arrow, warn.conflicts = FALSE)
   
   tbl <- data.frame(
     dbl = c(1:8, NA, 10) + .1,
     lgl = sample(c(TRUE, FALSE, NA), 10, replace = TRUE),
     false = logical(10),
     chr = letters[c(1:5, NA, 7:10)]
   )
   
   tflz4 <- tempfile(fileext = ".csv.lz4")
   write_csv_arrow(tbl, tflz4)
   read_csv_arrow(tflz4)
   #>     dbl   lgl false  chr
   #> 1   1.1  TRUE FALSE    a
   #> 2   2.1 FALSE FALSE    b
   #> 3   3.1 FALSE FALSE    c
   #> 4   4.1  TRUE FALSE    d
   #> 5   5.1  TRUE FALSE    e
   #> 6   6.1 FALSE FALSE <NA>
   #> 7   7.1    NA FALSE    g
   #> 8   8.1 FALSE FALSE    h
   #> 9    NA    NA FALSE    i
   #> 10 10.1 FALSE FALSE    j
   ```
   
   I don't have a sanitizer build set up locally and may need some help!


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