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Posted to jira@arrow.apache.org by "Romain Francois (Jira)" <ji...@apache.org> on 2021/09/27 08:49:00 UTC
[jira] [Assigned] (ARROW-14138) [R] update metadata when casting a
record batch column
[ https://issues.apache.org/jira/browse/ARROW-14138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Romain Francois reassigned ARROW-14138:
---------------------------------------
Assignee: Romain Francois
> [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
> Assignee: 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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