Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17191
@gatorsmile I checked and actually MySQL and PostgreSQL cannnot use numbers
as alias names;
```
// PostgreSQL
postgres=# SELECT gkey1 AS 1 FROM t2;
ERROR: syntax error at or near "1"
LINE 1: SELECT gkey1 AS 1 FROM t2;
// MySQL
mysql> select gkey1 AS 1 from t2;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use near
'1 from t2' at line 1
mysql>
```
In current master, spark have the same behaviour; the parser throws an
exception in the case;
```
scala> sql("SELECT key1 AS 1 FROM t").show
org.apache.spark.sql.catalyst.parser.ParseException:
extraneous input '1' expecting {<EOF>, ',', 'FROM', 'WHERE', 'GROUP',
'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS',
'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 15)
== SQL ==
SELECT key1 AS 1 FROM t
---------------^^^
at
org.apache.spark.sql.catalyst.parser.ParseException.withCommand(ParseDriver.scala:205)
```
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