Fix join precedence for non-snowflake queries

Author: Dimchikkk

src/parser/mod.rs

@@ -12467,7 +12467,7 @@ impl<'a> Parser<'a> {
                 };
                 let mut relation = self.parse_table_factor()?;
 
-                if self.peek_parens_less_nested_join() {
+                if dialect_of!(self is SnowflakeDialect) && self.peek_parens_less_nested_join() {
                     let joins = self.parse_joins()?;
                     relation = TableFactor::NestedJoin {
                         table_with_joins: Box::new(TableWithJoins { relation, joins }),

tests/sqlparser_common.rs

@@ -15356,3 +15356,25 @@ fn check_enforced() {
         "CREATE TABLE t (a INT, b INT, c INT, CHECK (a > 0) NOT ENFORCED, CHECK (b > 0) ENFORCED, CHECK (c > 0))",
     );
 }
+
+#[test]
+fn join_precedence() {
+    all_dialects_except(|d| d.is::<SnowflakeDialect>()).verified_query_with_canonical(
+        "SELECT *
+         FROM t1
+         NATURAL JOIN t5
+         INNER JOIN t0 ON (t0.v1 + t5.v0) > 0
+         WHERE t0.v1 = t1.v0",
+        // canonical string without parentheses
+        "SELECT * FROM t1 NATURAL JOIN t5 INNER JOIN t0 ON (t0.v1 + t5.v0) > 0 WHERE t0.v1 = t1.v0",
+    );
+    TestedDialects::new(vec![Box::new(SnowflakeDialect {})]).verified_query_with_canonical(
+        "SELECT *
+         FROM t1
+         NATURAL JOIN t5
+         INNER JOIN t0 ON (t0.v1 + t5.v0) > 0
+         WHERE t0.v1 = t1.v0",
+        // canonical string with parentheses
+        "SELECT * FROM t1 NATURAL JOIN (t5 INNER JOIN t0 ON (t0.v1 + t5.v0) > 0) WHERE t0.v1 = t1.v0",
+    );
+}