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Dragoș Moldovan-Grünfeld updated ARROW-14644: --------------------------------------------- Description: DragosMG: I believe this is a bug that should be fixed in the C++ code as there isn't an option we could leverage on the R side. I have draft PR with a failing test, but it's identical to Andy's _reproducible example_ below. Original description below: ====================== When a CSV file starts with byte order mark, {{arrow::open_dataset()}} reads the file but populates the first column with {{NA}} values. It appears a similar issue was raised and fixed here: https://issues.apache.org/jira/browse/ARROW-5413. {{read_csv_arrow()}} deals with the BOM correctly. Reproducible Example: {code:java} library(arrow) library(dplyr) writeLines('\xef\xbb\xbfa,b\n1,2\n', con = "testfile.csv") read_csv_arrow("testfile.csv") # works #> # A tibble: 1 × 2 #> a b #> <int> <int> #> 1 1 2 open_dataset("testfile.csv", format = "csv") |> collect() #> # A tibble: 1 × 2 #> a b #> <int> <int> #> 1 NA 2 {code} was: DragosMG: I believe this is a bug that should be fixed in the C++ code as there isn't an option we could leverage on the R side. I have draft PR with a failing test, but it's identical to Andy's _reproducible example_ below. Original description below. ====================== When a CSV file starts with byte order mark, {{arrow::open_dataset()}} reads the file but populates the first column with {{NA}} values. It appears a similar issue was raised and fixed here: https://issues.apache.org/jira/browse/ARROW-5413. {{read_csv_arrow()}} deals with the BOM correctly. Reproducible Example: {code:java} library(arrow) library(dplyr) writeLines('\xef\xbb\xbfa,b\n1,2\n', con = "testfile.csv") read_csv_arrow("testfile.csv") # works #> # A tibble: 1 × 2 #> a b #> <int> <int> #> 1 1 2 open_dataset("testfile.csv", format = "csv") |> collect() #> # A tibble: 1 × 2 #> a b #> <int> <int> #> 1 NA 2 {code} > [R] open_dataset doesn't ignore BOM in csv file > ----------------------------------------------- > > Key: ARROW-14644 > URL: https://issues.apache.org/jira/browse/ARROW-14644 > Project: Apache Arrow > Issue Type: Bug > Components: R > Affects Versions: 6.0.0 > Environment: macOS Mojave, R 4.1.1 > Reporter: Andy Teucher > Assignee: Dragoș Moldovan-Grünfeld > Priority: Major > Labels: pull-request-available > Time Spent: 10m > Remaining Estimate: 0h > > DragosMG: I believe this is a bug that should be fixed in the C++ code as > there isn't an option we could leverage on the R side. > I have draft PR with a failing test, but it's identical to Andy's > _reproducible example_ below. > Original description below: > ====================== > When a CSV file starts with byte order mark, {{arrow::open_dataset()}} reads > the file but populates the first column with {{NA}} values. It appears a > similar issue was raised and fixed here: > https://issues.apache.org/jira/browse/ARROW-5413. {{read_csv_arrow()}} deals > with the BOM correctly. > Reproducible Example: > {code:java} > library(arrow) > library(dplyr) > writeLines('\xef\xbb\xbfa,b\n1,2\n', con = "testfile.csv") > read_csv_arrow("testfile.csv") # works > #> # A tibble: 1 × 2 > #> a b > #> <int> <int> > #> 1 1 2 > open_dataset("testfile.csv", format = "csv") |> > collect() > #> # A tibble: 1 × 2 > #> a b > #> <int> <int> > #> 1 NA 2 {code} -- This message was sent by Atlassian Jira (v8.20.1#820001)