[ARROW-12277] [Rust][DataFusion] Min/Max are not supported for timestamp types

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28085
• Assignee: Andrew Lamb
• Reporter: Andrew Lamb
• Created: 07/Apr/21 18:23
• Updated: 11/Jan/23 08:25
• Resolved: 13/Apr/21 11:14

Description

If you try and aggregate (via MIN, for example) a column of a timestamp type, it generates an error:
```
Coercion from [Timestamp(Nanosecond, None)] to the signature Uniform(1, [Int8, Int16, Int32, Int64, UInt8, UInt16, UInt32, UInt64, Float32, Float64]) failed.
```

For example:

> show columns from t;
+---------------+--------------+------------+-------------+-----------------------------+-------------+
| table_catalog | table_schema | table_name | column_name | data_type                   | is_nullable |
+---------------+--------------+------------+-------------+-----------------------------+-------------+
| datafusion    | public       | t          | a           | Utf8                        | NO          |
| datafusion    | public       | t          | b           | Timestamp(Nanosecond, None) | NO          |
+---------------+--------------+------------+-------------+-----------------------------+-------------+
2 row in set. Query took 0 seconds.
> select sum(b) from t;
Plan("Coercion from [Timestamp(Nanosecond, None)] to the signature Uniform(1, [Int8, Int16, Int32, Int64, UInt8, UInt16, UInt32, UInt64, Float32, Float64]) failed.")

Issue Links

• links to: GitHub Pull Request #9970