alamb commented on issue #194:
URL:
https://github.com/apache/arrow-datafusion/issues/194#issuecomment-838971642
Here is a simpler reproducer:
```
echo "2020-09-08T12:00:00+00:00,2020-09-09T12:00:00+00:00" > /tmp/foo.csv
echo "2020-09-08T12:00:00+00:00,2020-09-08T11:00:00+00:00" >> /tmp/foo.csv
```
And then
```
>
CREATE EXTERNAL TABLE foo(ts1 timestamp, ts2 timestamp)
STORED AS CSV
LOCATION '/tmp/foo.csv';
0 rows in set. Query took 0 seconds.
>
SELECT ts2 - ts1 from foo;
Plan("\'Timestamp(Nanosecond, None) - Timestamp(Nanosecond, None)\' can\'t
be evaluated because there isn\'t a common type to coerce the types to")
```
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