neilconway commented on code in PR #11187:
URL: https://github.com/apache/arrow-rs/pull/11187#discussion_r4106853282


##########
arrow-arith/src/temporal.rs:
##########
@@ -184,6 +184,10 @@ where
 /// Returns an [`Int32Array`] unless input was a dictionary type, in which 
case returns
 /// the dictionary but with this function applied onto its values.
 ///
+/// Null inputs produce null outputs. A timestamp outside the supported 
calendar
+/// range also produces null, except that for timestamps without a timezone the
+/// time parts (`Hour` through `Nanosecond`) are defined for every value.

Review Comment:
   Cool. The current PR has documentation that seems sufficient to me, but lmk 
if you have suggestions for other places to document this.



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