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https://issues.apache.org/jira/browse/ARROW-13421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou reassigned ARROW-13421:
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Assignee: Antoine Pitrou
> [C++] Add functionality for reading in columns as floats from delimited
> files where a comma has been used as a decimal separator
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-13421
> URL: https://issues.apache.org/jira/browse/ARROW-13421
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Daniel Paierl
> Assignee: Antoine Pitrou
> Priority: Minor
> Fix For: 6.0.0
>
> Attachments: arrow_reprex.csv
>
>
> When reading in data where commas have been used as decimal separators (e.g.
> 3,141 to indicate pi), the column is read in as a character string. If I try
> to specify a schema in R, i.e.:
> {{# create table of values with decimal places}}
> {{set.seed(1)}}
> {{tbl <- tibble::tibble(x = rnorm(5))}}
> {{# write to disk with comma separator}}
> {{readr::write_csv2(tbl, "tst.csv")}}
> {{# read back in}}
> {{read_delim_arrow("tst.csv", delim = ";", schema = schema(x = float32()))}}
> I get the following error:
> {{Error: Invalid: In CSV column #0: CSV conversion error to float: invalid
> value 'x'}}
> {{/home/nic2/arrow/cpp/src/arrow/csv/converter.cc:437 decoder_.Decode(data,
> size, quoted, &value)}}
> {{/home/nic2/arrow/cpp/src/arrow/csv/parser.h:84 status}}
> {{/home/nic2/arrow/cpp/src/arrow/csv/converter.cc:441
> parser.VisitColumn(col_index, visit) }}
> Please can we have the functionality to be able to read in data from this
> format as it's fairly common across a number of countries?
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