alamb commented on issue #3248:
URL: 
https://github.com/apache/arrow-datafusion/issues/3248#issuecomment-1483335495

   This appears to be complete now:
   
   ```
   git alamb@MacBook-Pro-8:~/Software/influxdb_iox/flightsql/src$ datafusion-cli
   DataFusion CLI v20.0.0
   ❯ create view v as select 1 as a, 2 as b, 3 as c;
   0 rows in set. Query took 0.022 seconds.
   ❯ explain select * from (select b from v);
   +---------------+-----------------------------------+
   | plan_type     | plan                              |
   +---------------+-----------------------------------+
   | logical_plan  | SubqueryAlias: v                  |
   |               |   Projection: Int64(2) AS b       |
   |               |     EmptyRelation                 |
   | physical_plan | ProjectionExec: expr=[2 as b]     |
   |               |   EmptyExec: produce_one_row=true |
   |               |                                   |
   +---------------+-----------------------------------+
   ```


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