Ted-Jiang opened a new issue #2088: URL: https://github.com/apache/arrow-datafusion/issues/2088
**Describe the bug**
when i fix #2083
```
❯ select 1 union all select 2;
+-------------+
| placeholder |
+-------------+
| |
| 1 |
+-------------+
2 rows in set. Query took 0.003 seconds.
❯ explain select 1 union all select 2;
+---------------+-------------------------------------------------------+
| plan_type | plan |
+---------------+-------------------------------------------------------+
| logical_plan | Union |
| | Projection: Int64(1) |
| | EmptyRelation |
| | EmptyRelation |
| physical_plan | UnionExec |
| | ProjectionExec: expr=[1 as Int64(1)] |
| | RepartitionExec: partitioning=RoundRobinBatch(16) |
| | EmptyExec: produce_one_row=true |
| | EmptyExec: produce_one_row=true |
| | |
+---------------+-------------------------------------------------------+
2 rows in set. Query took 0.003 seconds.
❯ explain verbose select 1 union all select 2;
+-------------------------------------------------------+-------------------------------------------------------+
| plan_type | plan
|
+-------------------------------------------------------+-------------------------------------------------------+
| initial_logical_plan | Union
|
| | Projection:
Int64(1) |
| | EmptyRelation
|
| | Projection:
Int64(2) |
| | EmptyRelation
|
| logical_plan after simplify_expressions | SAME TEXT AS ABOVE
|
| logical_plan after eliminate_filter | SAME TEXT AS ABOVE
|
| logical_plan after common_sub_expression_eliminate | SAME TEXT AS ABOVE
|
| logical_plan after eliminate_limit | SAME TEXT AS ABOVE
|
| logical_plan after projection_push_down | Union
|
| | Projection:
Int64(1) |
| | EmptyRelation
|
| | EmptyRelation
|
| logical_plan after filter_push_down | SAME TEXT AS ABOVE
|
| logical_plan after limit_push_down | SAME TEXT AS ABOVE
|
| logical_plan after SingleDistinctAggregationToGroupBy | SAME TEXT AS ABOVE
|
| logical_plan after ToApproxPerc | SAME TEXT AS ABOVE
|
| logical_plan after simplify_expressions | SAME TEXT AS ABOVE
|
| logical_plan after eliminate_filter | SAME TEXT AS ABOVE
|
| logical_plan after common_sub_expression_eliminate | SAME TEXT AS ABOVE
|
| logical_plan after eliminate_limit | SAME TEXT AS ABOVE
|
| logical_plan after projection_push_down | SAME TEXT AS ABOVE
|
| logical_plan after filter_push_down | SAME TEXT AS ABOVE
|
| logical_plan after limit_push_down | SAME TEXT AS ABOVE
|
| logical_plan after SingleDistinctAggregationToGroupBy | SAME TEXT AS ABOVE
|
| logical_plan after ToApproxPerc | SAME TEXT AS ABOVE
|
| logical_plan | Union
|
| | Projection:
Int64(1) |
| | EmptyRelation
|
| | EmptyRelation
|
| initial_physical_plan | UnionExec
|
| | ProjectionExec:
expr=[1 as Int64(1)] |
| | EmptyExec:
produce_one_row=true |
| | EmptyExec:
produce_one_row=true |
| |
|
| physical_plan after aggregate_statistics | SAME TEXT AS ABOVE
|
| physical_plan after hash_build_probe_order | SAME TEXT AS ABOVE
|
| physical_plan after coalesce_batches | SAME TEXT AS ABOVE
|
| physical_plan after repartition | UnionExec
|
| | ProjectionExec:
expr=[1 as Int64(1)] |
| |
RepartitionExec: partitioning=RoundRobinBatch(16) |
| | EmptyExec:
produce_one_row=true |
| | EmptyExec:
produce_one_row=true |
| |
|
| physical_plan after add_merge_exec | SAME TEXT AS ABOVE
|
| physical_plan | UnionExec
|
| | ProjectionExec:
expr=[1 as Int64(1)] |
| |
RepartitionExec: partitioning=RoundRobinBatch(16) |
| | EmptyExec:
produce_one_row=true |
| | EmptyExec:
produce_one_row=true |
| |
|
+-------------------------------------------------------+-------------------------------------------------------+
27 rows in set. Query took 0.014 seconds.
```
**To Reproduce**
Steps to reproduce the behavior:
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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