[GitHub] [arrow-datafusion] mkmik commented on issue #2867: Error parsing valid SQL with aliases

[GitBox <gi...@apache.org>]

mkmik commented on issue #2867:
URL: https://github.com/apache/arrow-datafusion/issues/2867#issuecomment-1305401887

   I stumbled upon a bug that may be a simpler reproducer of this
   
   ```console
   ❯ select a from (select a from (select 1 as a) as foo group by 1 order by a) as c;
   SchemaError(FieldNotFound { field: Column { relation: Some("foo"), name: "a" }, valid_fields: Some([Column { relation: Some("c"), name: "a" }]) })
   ```
   
   ----
   
   Interestingly if I remove as c in the outer expression it works:
   
   ```console
   ❯ select a from (select a from (select 1 as a) as foo group by 1 order by a);
   +---+
   | a |
   +---+
   | 1 |
   +---+
   1 row in set. Query took 0.005 seconds.
   ```
   
   It's also interesting that using positional column references in the order by works:
   
   ```console
   ❯ select a from (select a from (select 1 as a) as foo group by 1 order by 1) as c;
   +---+
   | a |
   +---+
   | 1 |
   +---+
   1 row in set. Query took 0.005 seconds.
   ```
   
   Furthermore, the bug reproduces only if `group by a` and `order by a` are *both* present:
   
   ```console
   ❯ select a from (select a from (select 1 as a) as foo group by a) as c;
   +---+
   | a |
   +---+
   | 1 |
   +---+
   1 row in set. Query took 0.005 seconds.
   ❯ select a from (select a from (select 1 as a) as foo order by a) as c;
   +---+
   | a |
   +---+
   | 1 |
   +---+
   1 row in set. Query took 0.004 seconds.
   ```


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