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From "Thomas Sandmann (Jira)" <j...@apache.org>
Subject [jira] [Created] (ARROW-12852) Creating a schema from a named list - names seem to be dropped?
Date Sat, 22 May 2021 20:49:00 GMT
Thomas Sandmann created ARROW-12852:
---------------------------------------

             Summary: Creating a schema from a named list - names seem to be dropped?
                 Key: ARROW-12852
                 URL: https://issues.apache.org/jira/browse/ARROW-12852
             Project: Apache Arrow
          Issue Type: Bug
          Components: R
    Affects Versions: 4.0.0
         Environment: > sessionInfo()
R version 4.0.3 (2020-10-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dyliblocale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8attached base packages:
[1] stats graphics grDevices utils datasets methods
[7] baseother attached packages:
[1] arrow_4.0.0.1loaded via a namespace (and not attached):
[1] assertthat_0.2.1 R6_2.5.0 sys_3.4
[4] jsonlite_1.7.2 magrittr_2.0.1 credentials_1.3.0
[7] rlang_0.4.10 curl_4.3 vctrs_0.3.7
[10] tools_4.0.3 bit64_4.0.5 glue_1.4.2
[13] purrr_0.3.4 bit_4.0.4 compiler_4.0.3
[16] askpass_1.1 openssl_1.4.3 tidyselect_1.1.0
            Reporter: Thomas Sandmann


I am trying to create a schema from a named list of data types, but can't figure out how.
The manual page reads:

{{... named list of data types}}


When I pass a list with names to the [schema|[https://github.com/cran/arrow/blob/45beab2efdb0128a5494bb686357b6c3d6c63989/R/schema.R#L140]]
function I get an assertion error:

{{library(arrow)}}
{{ x <- list(col1 = int8(), col2 = float32())}}

{{names(x)}}
{{ [1] "col1" "col2"}}

{{schema(x)}}
{{ Error: !is.null(nms <- names(.list)) is not TRUE}}

It seems that the internal [.fields|[https://github.com/cran/arrow/blob/45beab2efdb0128a5494bb686357b6c3d6c63989/R/field.R#L75]] function
is dropping the names. Maybe I misunderstood the documentation and there is another way to
define the ellipsis of the `schema` function?

{{arrow:::.fields(x)}}{{[[1]]}}
{{ Field}}
{{ col1: int8}}{{[[2]]}}
{{ Field}}
{{ col2: float}}

 



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