Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18079
It sounds like PostgresSQL supports it. See the docs in
https://www.postgresql.org/docs/9.2/static/sql-select.html
Actually, we also need to support the other alias in the from clauses:
See the link: https://drill.apache.org/docs/from-clause/ and
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 [, ...] ) ]
```
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