jdye64 opened a new issue, #2943:
URL: https://github.com/apache/arrow-datafusion/issues/2943
**Describe the bug**
When running the query
```
SELECT * FROM a
UNION SELECT * FROM b
UNION SELECT * FROM c
ORDER BY b NULLS FIRST, c NULLS FIRST
```
I noticed that the `schema` returned from
[&plan.schema()](https://github.com/apache/arrow-datafusion/blob/master/datafusion/expr/src/utils.rs#L579)
does not have the qualifiers in the result
```
DFSchema { fields: [DFField { qualifier: None, field: Field { name: "b",
data_type: Float64, nullable: true, dict_id: 0, dict_is_ordered: false,
metadata: None } }, DFField { qualifier: None, field: Field { name: "c",
data_type: Utf8, nullable: true, dict_id: 0, dict_is_ordered: false, metadata:
None } }], metadata: {} }
```
The explain of the `Union` is ...
```
Union
Projection: #a.b, #a.c
TableScan: a projection=[b, c]
Projection: #b.b, #b.c
TableScan: b projection=[b, c]
Projection: #c.b, #c.c
TableScan: c projection=[b, c]
```
**To Reproduce**
Invoke `utils.rs` function `exprlist_to_fields` with the information
supplied above.
**Expected behavior**
The qualifiers be present in the resulting schema.
**Additional context**
None
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