xudong963 commented on pull request #1067:
URL: https://github.com/apache/arrow-datafusion/pull/1067#issuecomment-932887430
```
> CREATE EXTERNAL TABLE customer STORED AS CSV LOCATION
'/Users/bytedance/arrow-datafusion/datafusion/tests/customer.csv';
0 rows in set. Query took 0.014 seconds.
> explain select * from customer as a join (select * from customer as b) on
a.column_1=b.column_1;
Plan("subquery in FROM must have an alias")
> explain select * from customer as a join (select * from customer) as b on
a.column_1=b.column_1;
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| plan_type | plan
|
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| logical_plan | Projection: #a.column_1, #a.column_2, #b.column_1,
#b.column_2
|
| | Join: #a.column_1 = #b.column_1
|
| | TableScan: a projection=Some([0, 1])
|
| | Projection: #customer.column_1, #customer.column_2
|
| | TableScan: customer projection=Some([0, 1])
|
| physical_plan | ProjectionExec: expr=[column_1@0 as column_1, column_2@1
as column_2, column_1@2 as column_1, column_2@3 as column_2]
|
| | CoalesceBatchesExec: target_batch_size=4096
|
| | HashJoinExec: mode=Partitioned, join_type=Inner,
on=[(Column { name: "column_1", index: 0 }, Column { name: "column_1", index: 0
})] |
| | CoalesceBatchesExec: target_batch_size=4096
|
| | RepartitionExec: partitioning=Hash([Column { name:
"column_1", index: 0 }], 12)
|
| | RepartitionExec:
partitioning=RoundRobinBatch(12)
|
| | CsvExec:
source=Path(/Users/bytedance/arrow-datafusion/datafusion/tests/customer.csv:
[/Users/bytedance/arrow-datafusion/datafusion/tests/customer.csv]),
has_header=false |
| | CoalesceBatchesExec: target_batch_size=4096
|
| | RepartitionExec: partitioning=Hash([Column { name:
"column_1", index: 0 }], 12)
|
| | ProjectionExec: expr=[column_1@0 as column_1,
column_2@1 as column_2]
|
| | RepartitionExec:
partitioning=RoundRobinBatch(12)
|
| | CsvExec:
source=Path(/Users/bytedance/arrow-datafusion/datafusion/tests/customer.csv:
[/Users/bytedance/arrow-datafusion/datafusion/tests/customer.csv]),
has_header=false |
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set. Query took 0.010 seconds.
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