yukkit opened a new issue, #5218:
URL: https://github.com/apache/arrow-datafusion/issues/5218
**Describe the bug**
A clear and concise description of what the bug is.
When the child node of union contains `EmptyRelation`, the plan generated by
optimization rule `propagate_empty_relation` is wrong.
**To Reproduce**
Steps to reproduce the behavior:
1. query
```sql
create table m2(intt int) as select 1 as intt;
explain
SELECT
*
FROM
m2
WHERE
false IS UNKNOWN
UNION ALL
SELECT
*
FROM
m2
WHERE
NOT false IS UNKNOWN
UNION ALL
SELECT
*
FROM
m2
WHERE
false IS UNKNOWN IS NULL;
```
2. result
```
+---------------+----------------------------------+
| plan_type | plan |
+---------------+----------------------------------+
| logical_plan | EmptyRelation |
| physical_plan | EmptyExec: produce_one_row=false |
| | |
+---------------+----------------------------------+
```
**Expected behavior**
A clear and concise description of what you expected to happen.
```
+---------------+-------------------------------------------------+
| plan_type | plan |
+---------------+-------------------------------------------------+
| logical_plan | Projection: m2.intt |
| | TableScan: m2 projection=[intt] |
| physical_plan | ProjectionExec: expr=[intt@0 as intt] |
| | MemoryExec: partitions=1, partition_sizes=[1] |
| | |
+---------------+-------------------------------------------------+
```
**Additional context**
Add any other context about the problem here.
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