xudong963 edited a comment on issue #1414:
URL:
https://github.com/apache/arrow-datafusion/issues/1414#issuecomment-988087938
FYI
**postgres**
```sql
postgres=# create table foo (
a int,
b int
);
CREATE TABLE
postgres=# insert into foo (a, b) values (1, 2);
insert into foo (a, b) values (null, 3);
INSERT 0 1
INSERT 0 1
postgres=# select a from foo order by 1;
a
---
1
(2 rows)
postgres=# select a, b from foo order by 1;
a | b
---+---
1 | 2
| 3
(2 rows)
postgres=# select a, b from foo order by 1 desc;
a | b
---+---
| 3
1 | 2
(2 rows)
postgres=# select a, b from foo order by 2 desc;
a | b
---+---
| 3
1 | 2
(2 rows)
postgres=# select a from foo order by 2;
ERROR: ORDER BY position 2 is not in select list
LINE 1: select a from foo order by 2;
^
postgres=#
```
**Datafusion**
```sql
❯ select column1 from foo order by 1;
ArrowError(ExternalError(Plan("Sort operation is not applicable to scalar
value 1")))
```
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