alamb opened a new issue #933:
URL: https://github.com/apache/arrow-datafusion/issues/933
**Describe the bug**
The output of EXPLAIN when the query has a `UNION ALL` contains placeholder
text rather than the operator name
**To Reproduce**
Reproducer:
```shell
echo "1,A" > /tmp/foo.csv
echo "1,B" >> /tmp/foo.csv
echo "2,A" >> /tmp/foo.csv
```
Run CLI
```shell
cargo run --bin datafusion-cli
```
```sql
CREATE EXTERNAL TABLE foo(x INT, b VARCHAR) STORED AS CSV LOCATION
'/tmp/foo.csv';
EXPLAIN SELECT x FROM foo UNION ALL SELECT x FROM foo;
```
Actual output:
```sql
> EXPLAIN SELECT x FROM foo UNION ALL SELECT x FROM foo;
+---------------+----------------------------------------------------------------------------+
| plan_type | plan
|
+---------------+----------------------------------------------------------------------------+
| logical_plan | Union
|
| | Projection: #foo.x
|
| | TableScan: foo projection=Some([0])
|
| | Projection: #foo.x
|
| | TableScan: foo projection=Some([0])
|
| physical_plan | ExecutionPlan(PlaceHolder)
|
| | ProjectionExec: expr=[x@0 as x]
|
| | RepartitionExec: partitioning=RoundRobinBatch(16)
|
| | CsvExec: source=Path(/tmp/foo.csv: [/tmp/foo.csv]),
has_header=false |
| | ProjectionExec: expr=[x@0 as x]
|
| | RepartitionExec: partitioning=RoundRobinBatch(16)
|
| | CsvExec: source=Path(/tmp/foo.csv: [/tmp/foo.csv]),
has_header=false |
+---------------+----------------------------------------------------------------------------+
```
Note the `ExecutionPlan(PlaceHolder)` which is the placeholder txt.
**Expected behavior**
I expect `ExecutionPlan(PlaceHolder)` to say `UnionExec` or something similar
**Additional context**
I think the `fmt_as` needs to be implemented for the `UnionExec` operator
It would also be cool to review all `impl ExecutionPlan` in DataFusion to
make sure `fmt_as` has been provded
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