Andrew Lamb created ARROW-12277:
-----------------------------------
Summary: [Rust][DataFusion] Aggregates are not supported for
timestamp types
Key: ARROW-12277
URL: https://issues.apache.org/jira/browse/ARROW-12277
Project: Apache Arrow
Issue Type: Improvement
Reporter: Andrew Lamb
Assignee: Andrew Lamb
If you try and aggregate (via SUM, 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:
{code}
> 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.")
{code}
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