adriangb opened a new issue, #17503:
URL: https://github.com/apache/datafusion/issues/17503
### Describe the bug
Trying to debug another bug and I found that `explain` is broken in two ways:
1. It's replacing the actual expressions with `__comon_expr` which seems
like an optimization but that should not preclude seeing the values in the
output.
2. explain verbose uses the tree format (as opposed to the line format as
claimed in the documentation), is verbose being ignored altogether?
### To Reproduce
```sql
COPY (
SELECT arrow_cast('2025-01-01T00:00:00Z'::timestamptz,
'Timestamp(Microsecond, Some("UTC"))') AS start_timestamp
)
TO 'test.parquet'
STORED AS PARQUET;
CREATE EXTERNAL TABLE test STORED AS PARQUET LOCATION 'test.parquet';
explain verbose
select start_timestamp from test where start_timestamp::time between
arrow_cast('20:04:13', 'Time64(Nanosecond)') and arrow_cast('20:08:13',
'Time64(Nanosecond)');
```
```
+---------------+-------------------------------+
| plan_type | plan |
+---------------+-------------------------------+
| physical_plan | ┌───────────────────────────┐ |
| | │ CoalesceBatchesExec │ |
| | │ -------------------- │ |
| | │ target_batch_size: │ |
| | │ 8192 │ |
| | └─────────────┬─────────────┘ |
| | ┌─────────────┴─────────────┐ |
| | │ FilterExec │ |
| | │ -------------------- │ |
| | │ predicate: │ |
| | │ __common_expr_3 >= │ |
| | │ 72253000000000 │ |
| | │ AND __common_expr_3 <= │ |
| | │ 72493000000000 │ |
| | └─────────────┬─────────────┘ |
| | ┌─────────────┴─────────────┐ |
| | │ ProjectionExec │ |
| | │ -------------------- │ |
| | │ __common_expr_3: │ |
| | │ CAST(start_timestamp AS │ |
| | │ Time64(Nanosecond)) │ |
| | │ │ |
| | │ start_timestamp: │ |
| | │ start_timestamp │ |
| | └─────────────┬─────────────┘ |
| | ┌─────────────┴─────────────┐ |
| | │ DataSourceExec │ |
| | │ -------------------- │ |
| | │ files: 1 │ |
| | │ format: parquet │ |
| | └───────────────────────────┘ |
| | |
+---------------+-------------------------------+
```
### Expected behavior
_No response_
### Additional context
_No response_
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