jhorstmann commented on code in PR #2932:
URL: https://github.com/apache/arrow-rs/pull/2932#discussion_r1005422815
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arrow/src/compute/kernels/cast.rs:
##########
@@ -3853,8 +3853,8 @@ mod tests {
let b = cast(&array, &DataType::Utf8).unwrap();
let c = b.as_any().downcast_ref::<StringArray>().unwrap();
assert_eq!(&DataType::Utf8, c.data_type());
- assert_eq!("1997-05-19 00:00:00.005", c.value(0));
- assert_eq!("2018-12-25 00:00:00.001", c.value(1));
+ assert_eq!("1997-05-19 00:00:00.005 +00:00", c.value(0));
+ assert_eq!("2018-12-25 00:00:00.001 +00:00", c.value(1));
Review Comment:
That looks like [rfc3339
format](https://www.rfc-editor.org/rfc/rfc3339#section-5.6), which is probably
the most common or standardized format.
[`chrono` has a separate function for this
format](https://docs.rs/chrono/latest/chrono/struct.DateTime.html#method.to_rfc3339_opts)
which also allows specifying how many fractional digits you want.
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