maropu commented on a change in pull request #23259: [SPARK-26215][SQL] Define
reserved/non-reserved keywords based on the ANSI SQL standard
URL: https://github.com/apache/spark/pull/23259#discussion_r258914082
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
##########
@@ -720,14 +725,18 @@ qualifiedName
identifier
: strictIdentifier
+ // We can't move the tokens below into `strictIdentifier` because we need
to parse some SQL texts,
+ // e.g., SELECT * FROM t1 CROSS JOIN t2
| ANTI | FULL | INNER | LEFT | SEMI | RIGHT | NATURAL | JOIN | CROSS | ON
| UNION | INTERSECT | EXCEPT | SETMINUS
;
strictIdentifier
- : IDENTIFIER #unquotedIdentifier
- | quotedIdentifier #quotedIdentifierAlternative
- | nonReserved #unquotedIdentifier
+ : IDENTIFIER #unquotedIdentifier
+ | quotedIdentifier #quotedIdentifierAlternative
+ | {ansi}? ansiReserved #unquotedIdentifier
Review comment:
Aha, I see. If so, looks ok to me. I just follow the PostgreSQL behaivour;
```
postgres=# select * from t select;
ERROR: syntax error at or near "select" at character 17
STATEMENT: select * from t select;
ERROR: syntax error at or near "select"
LINE 1: select * from t select;
```
In the pg, we cannot use reserved keywords in a table alias.
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