[jira] [Created] (ARROW-14138) [R] allow nbytes to be missing in RandomAccessFile$Read()

["Romain Francois (Jira)" <ji...@apache.org>]

Romain Francois created ARROW-14138:
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             Summary: [R] allow nbytes to be missing in RandomAccessFile$Read()
                 Key: ARROW-14138
                 URL: https://issues.apache.org/jira/browse/ARROW-14138
             Project: Apache Arrow
          Issue Type: Improvement
          Components: R
            Reporter: Romain Francois


library(arrow, warn.conflicts = FALSE)
#> See arrow_info() for available features

raws <- structure(list(
  as.raw(c(0x70, 0x65, 0x72, 0x73, 0x6f, 0x6e))
), class = c("arrow_binary", "vctrs_vctr", "list"))
batch <- record_batch(b = raws)
batch$metadata$r
#>  'arrow_r_metadata' chr "A\n3\n262147\n197888\n5\nUTF-8\n531\n1\n531\n1\n531\n2\n531\n1\n16\n3\n262153\n12\narrow_binary\n262153\n10\nvc"| __truncated__
#> List of 1
#>  $ columns:List of 1
#>   ..$ b:List of 2
#>   .. ..$ attributes:List of 1
#>   .. .. ..$ class: chr [1:3] "arrow_binary" "vctrs_vctr" "list"
#>   .. ..$ columns   : NULL

# when casting `b` to a string column, the metadata is kept
batch$b <- batch$b$cast(utf8())
batch$metadata$r
#>  'arrow_r_metadata' chr "A\n3\n262147\n197888\n5\nUTF-8\n531\n1\n531\n1\n531\n2\n531\n1\n16\n3\n262153\n12\narrow_binary\n262153\n10\nvc"| __truncated__
#> List of 1
#>  $ columns:List of 1
#>   ..$ b:List of 2
#>   .. ..$ attributes:List of 1
#>   .. .. ..$ class: chr [1:3] "arrow_binary" "vctrs_vctr" "list"
#>   .. ..$ columns   : NULL

# but it should not have
batch2 <- record_batch(b = "string")
batch2$metadata$r
#> NULL



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