alamb opened a new issue #314:
URL: https://github.com/apache/arrow-datafusion/issues/314
**Describe the bug**
A query panic'd on me
**To Reproduce**
Make a local file
```
echo "2018-11-13T17:11:10.011" > /tmp/foo.csv
echo "2018-12-13T12:12:10.011" >> /tmp/foo.csv
echo "2018-12-13T12:12:10.011" >> /tmp/foo.csv
echo "2018-12-13T12:13:10.011" >> /tmp/foo.csv
```
Run a query with datafusion-cli
```
cargo run -p datafusion-cli
Finished dev [unoptimized + debuginfo] target(s) in 0.12s
Running `target/debug/datafusion-cli`
> CREATE EXTERNAL TABLE foo(ts TIMESTAMP)
STORED AS CSV
LOCATION '/tmp/foo.csv';
0 rows in set. Query took 0 seconds.
> SELECT COUNT(DISTINCT ts) from foo;
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'thread 'Unexpected DataType for
listthread '',
tokio-runtime-workerdatafusion/src/scalar.rstokio-runtime-worker' panicked at
':' panicked at 'Unexpected DataType for list366Unexpected DataType for list',
:', thread
'datafusion/src/scalar.rsdatafusion/src/scalar.rstokio-runtime-worker22:thread
'' panicked at ':
366366Unexpected DataType for list:tokio-runtime-worker:', 22thread
'22datafusion/src/scalar.rs' panicked at 'tokio-runtime-worker
Unexpected DataType for list' panicked at '
', :Unexpected DataType for listdatafusion/src/scalar.rs366thread
'::tokio-runtime-worker366', ' panicked at
':22datafusion/src/scalar.rsUnexpected DataType for list
22', :
datafusion/src/scalar.rsthread '366:tokio-runtime-worker:366' panicked at
'22:Unexpected DataType for list
22',
datafusion/src/scalar.rs:366:22
thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
ArrowError(ExternalError(Canceled))
datafusion/src/scalar.rs:366:22
> thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list',
datafusion/src/scalar.rs:366:22
```
**Expected behavior**
I expect a result to be produced with 3 distinct timestamp values
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