feat: Allow expressions in LIMIT

Author: MazterQyou

src/parser.rs

@@ -4243,7 +4243,7 @@ impl<'a> Parser<'a> {
         if self.parse_keyword(Keyword::ALL) {
             Ok(None)
         } else {
-            Ok(Some(Expr::Value(self.parse_number_value()?)))
+            Ok(Some(self.parse_expr()?))
         }
     }
 

tests/sqlparser_common.rs

@@ -4614,6 +4614,13 @@ fn test_placeholder() {
             right: Box::new(Expr::Value(Value::Placeholder("$Id1".into())))
         })
     );
+
+    let sql = "SELECT * FROM student LIMIT $1";
+    let ast = dialects.verified_query(sql);
+    assert_eq!(
+        ast.limit,
+        Some(Expr::Value(Value::Placeholder("$1".into())))
+    );
 }
 
 #[test]