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