[jira] [Updated] (ARROW-14138) [R] update metadata when casting a record batch column

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

     [ https://issues.apache.org/jira/browse/ARROW-14138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Romain Francois updated ARROW-14138:
------------------------------------
    Summary: [R] update metadata when casting a record batch column  (was: [R] allow nbytes to be missing in RandomAccessFile$Read())

> [R] update metadata when casting a record batch column
> ------------------------------------------------------
>
>                 Key: ARROW-14138
>                 URL: https://issues.apache.org/jira/browse/ARROW-14138
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Romain Francois
>            Priority: Minor
>
> 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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