gandronchik commented on issue #2083:
URL:
https://github.com/apache/arrow-datafusion/issues/2083#issuecomment-1108443457
It doesn't work in the current version.
`select 1 union select 2;`
ArrowError(ExternalError(Execution("Arrow error: External error: Internal
error: Unsupported data type in hasher: Null. This was likely caused by a bug
in DataFusion's code and we would welcome that you file an bug report in our
issue tracker")))
`SELECT 1 a UNION ALL SELECT 2;`
```
+-------------+
| placeholder |
+-------------+
| |
| 1 |
+-------------+
```
I fixed it. Now result is:
`select 1 union select 2;`
```
+----------+
| Int64(1) |
+----------+
| 2 |
| 1 |
+----------+
```
`SELECT 1 a UNION ALL SELECT 2;`
```
+---+
| a |
+---+
| 1 |
| 2 |
+---+
```
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