jiangzhx commented on issue #5635:
URL:
https://github.com/apache/arrow-datafusion/issues/5635#issuecomment-1477285559
```
// let sql = "SELECT to_date(a) as u from t group by u"; //got
error
// let sql = "SELECT to_timestamp(a) as u from t group by u"; //got
error
// let sql = "SELECT to_date(a) as u from t group by u order by u";
//got right
// let sql = "SELECT to_timestamp(a) as u from t group by u order by u";
//got right
```
the difference is append `order by u`
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