alamb commented on a change in pull request #771:
URL: https://github.com/apache/arrow-rs/pull/771#discussion_r713251376



##########
File path: arrow/src/compute/kernels/temporal.rs
##########
@@ -294,4 +301,54 @@ mod tests {
         assert!(!b.is_valid(1));
         assert_eq!(7, b.value(2));
     }
+
+    #[test]
+    fn test_temporal_array_timestamp_second_with_timezone() {
+        use std::sync::Arc;
+
+        let a = Arc::new(TimestampSecondArray::from_vec(
+            vec![10, 20],
+            Some("+0000".to_string()),

Review comment:
       The description in the PR says 
   
   > Anything of the form [+-]XX:XX will be recognized but nothing of the form 
eg America/Newyork will start returning error
   
   However, these tests use the form `XXXX`
   
   Is that intentional? 
   
   The arrow schema says a numeric timezone should contain a colon (`:`) I 
believe; https://github.com/apache/arrow/blob/master/format/Schema.fbs#L341-L351
   
   > An absolute timezone offset of the form "+XX:XX" or "-XX:XX",
   >   ///   such as "+07:30".

##########
File path: arrow/src/array/array_primitive.rs
##########
@@ -232,6 +232,19 @@ where
         as_datetime::<T>(i64::from(self.value(i)))
     }
 
+    /// Returns value as a chrono `NaiveDateTime`, handling time resolution 
with the provided tz

Review comment:
       🤔  what do you think about making this generic so that when non fixed 
timezones are supported no changes are required? 
   
   For example, perhaps something like:
   
   ```rust
       pub fn value_as_datetime_with_tz<Tz: TimeZone>(
           &self,
           i: usize,
           tz: Tz,
       ) -> Option<NaiveDateTime>
       {
        ..
       }
   ```
   https://docs.rs/chrono/0.4.19/chrono/offset/trait.TimeZone.html




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