Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17191
Ah, I see. In a basic stance, I think we should do the same behaviour with
existing databases. You're right and `select k1 as kx from t group by kx`
should fail;
```
// PostgreSQL
Column | Type | Modifiers
--------+---------+-----------
key | integer |
value | integer |
postgres=# select key AS k, k FROM t;
ERROR: column "k" does not exist at character 18
```
Anyway, I agree with your suggestion; we should make PRs as much small as
possible, and so I reconsider this pr again to fix the point in the description.
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