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

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-14231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li reassigned ARROW-14231:
--------------------------------

    Assignee: David Li

> [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: Improvement
>          Components: C++
>            Reporter: Nicola Crane
>            Assignee: David Li
>            Priority: Major
>              Labels: kernel
>             Fix For: 6.0.0
>
>
> 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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