[jira] [Created] (ARROW-14231) [C++] Can't cast from timestamp to utf8 when saving CSV

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

Nicola Crane created ARROW-14231:
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             Summary: [C++] Can't cast from timestamp to utf8 when saving CSV
                 Key: ARROW-14231
                 URL: https://issues.apache.org/jira/browse/ARROW-14231
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Nicola Crane


The R code below creates a simple data frame containing a datetime (timestamp) object, but when I try to save this to disk I get an "unsupported cast" error.

{code:r}
library(arrow)
df <- tibble::tibble(datetime = as.POSIXct(c("2020-07-20 16:20", NA), tz = "UTC"))
write_csv_arrow(df, "df.csv")
# Error: NotImplemented: Unsupported cast from timestamp[us, tz=UTC] to utf8 using function cast_string
# /home/nic2/arrow/cpp/src/arrow/compute/function.cc:215  DispatchBest(&inputs)
# /home/nic2/arrow/cpp/src/arrow/compute/cast.cc:229  Cast(Datum(value), to_type, options, ctx)
# /home/nic2/arrow/cpp/src/arrow/csv/writer.cc:101  compute::Cast(data, utf8(), compute::CastOptions(), &ctx)
# /home/nic2/arrow/cpp/src/arrow/csv/writer.cc:395  column_populators_[col]->UpdateRowLengths(*batch.column(col), offsets_.data())
# /home/nic2/arrow/cpp/src/arrow/csv/writer.cc:324  TranslateMinimalBatch(*batch)
# /home/nic2/arrow/cpp/src/arrow/csv/writer.cc:434  writer->WriteTable(table)
{code}




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