[jira] [Commented] (ARROW-13421) [R] Add choice for decimal marker in read_delim_arrow

["Nic Crane (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-13421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17384829#comment-17384829 ] 

Nic Crane commented on ARROW-13421:
-----------------------------------

Hi [~Ruser], thanks for reporting this!  Would you be able to provide a short reproducible example of what you're trying to do?  I tried writing my own example based on the description above, but the data was read in as a double and not a string.


{code:r}
set.seed(1)
# create a table of value
tbl <- tibble::tibble(x = rnorm(5))
tbl
# A tibble: 5 x 1
#        x
#    <dbl>
# 1 -0.626
# 2  0.184
# 3 -0.836
# 4  1.60 
# 5  0.330

# create file to write to
tf <- tempfile()

# write table to file
write.table(tbl, tf , sep = "\t", row.names = FALSE)

# read back in
tab <- read_delim_arrow(tf, delim = "\t")

# display results
tab
# A tibble: 5 x 1
#        x
#    <dbl>
# 1 -0.626
# 2  0.184
# 3 -0.836
# 4  1.60
# 5  0.330
# {code}


> [R] Add choice for decimal marker in read_delim_arrow
> -----------------------------------------------------
>
>                 Key: ARROW-13421
>                 URL: https://issues.apache.org/jira/browse/ARROW-13421
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>    Affects Versions: 4.0.1
>            Reporter: Daniel Paierl
>            Priority: Minor
>              Labels: R
>
> In the R arrow package read_delim_arrow lacks the option to specify the decimal marker (e.g. comma or point) in the parsing options.
> This is a major inconvenience for data with a _point_ as a decimal marker (european users) since the data is read in as astring which requires post-hoc conversion of the string to double. 
>  
> Request: Add a parsing option to set the decimal marker if that is possible.



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