psvri commented on code in PR #3183:
URL: https://github.com/apache/arrow-rs/pull/3183#discussion_r1031733918
##########
arrow-cast/src/display.rs:
##########
@@ -549,3 +553,34 @@ pub fn lexical_to_string<N: lexical_core::ToLexical>(n: N)
-> String {
String::from_utf8_unchecked(buf)
}
}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_array_value_to_string_duration() {
+ let ns_array =
+ Arc::new(DurationNanosecondArray::from(vec![Some(1), None])) as
ArrayRef;
+ assert_eq!(
+ array_value_to_string(&ns_array, 0).unwrap(),
+ "PT0.000000001S"
+ );
+ assert_eq!(array_value_to_string(&ns_array, 1).unwrap(), "");
+
+ let us_array =
+ Arc::new(DurationMicrosecondArray::from(vec![Some(1), None])) as
ArrayRef;
+ assert_eq!(array_value_to_string(&us_array, 0).unwrap(),
"PT0.000001S");
Review Comment:
`chrono::Duration.to_string()` is displayed like that. We cannot use
std::time::Duration here because arrow array duration can be negative.
IMHO is am very tempted to replace `P` and `T` chars and make the `S` as
small to improve readability.
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