Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18079
Yeah. That should be a negative case. The `FROM clause` should be resolved
before `SELECT clause`.
The PR title is not accurate. I think we should keep the original JIRA
name. `Support table column aliases in FROM clause`.
Yeah. These cases should be part of this JIRA. Please add the sub-tasks
under this JIRA. Follow what Redshift documents and do them one by
one?http://docs.aws.amazon.com/redshift/latest/dg/r_FROM_clause30.html
```SQL
with_subquery_table_name [ [ AS ] alias [ ( column_alias [, ...] ) ] ]
table_name [ * ] [ [ AS ] alias [ ( column_alias [, ...] ) ] ]
( subquery ) [ AS ] alias [ ( column_alias [, ...] ) ]
table_reference [ NATURAL ] join_type table_reference
[ ON join_condition | USING ( join_column [, ...] ) ]
```
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