houqp commented on a change in pull request #7500:
URL: https://github.com/apache/arrow/pull/7500#discussion_r445998007



##########
File path: rust/parquet/src/record/api.rs
##########
@@ -893,16 +893,6 @@ mod tests {
         assert_eq!(row, Field::TimestampMillis(1238544060000));
     }
 
-    #[test]
-    #[should_panic(expected = "Expected non-negative milliseconds when 
converting Int96")]
-    fn test_row_convert_int96_invalid() {
-        // INT96 value does not depend on logical type
-        let descr = make_column_descr![PhysicalType::INT96, LogicalType::NONE];
-
-        let value = Int96::from(vec![0, 0, 0]);
-        Field::convert_int96(&descr, value);
-    }
-

Review comment:
       I agree that it's better to implement timestamp as signed, not only does 
it address the support for time before 1970, but also make it much easier to 
work with subtractions.




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