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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