Support placeholders ($ or ?) in LIMIT clause (#494)

* fix: limit $1

* feat: test limit $1

* Update Cargo.toml

* cargo fmt

Co-authored-by: Andrew Lamb <[email protected]>

Author: step-baby

src/parser.rs

@@ -2592,6 +2592,7 @@ impl<'a> Parser<'a> {
     pub fn parse_number_value(&mut self) -> Result<Value, ParserError> {
         match self.parse_value()? {
             v @ Value::Number(_, _) => Ok(v),
+            v @ Value::Placeholder(_) => Ok(v),
             _ => {
                 self.prev_token();
                 self.expected("literal number", self.peek_token())
@@ -4356,7 +4357,7 @@ impl Word {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::test_utils::all_dialects;
+    use crate::test_utils::{all_dialects, TestedDialects};
 
     #[test]
     fn test_prev_index() {
@@ -4378,4 +4379,38 @@ mod tests {
             parser.prev_token();
         });
     }
+
+    #[test]
+    fn test_parse_limit() {
+        let sql = "SELECT * FROM user LIMIT 1";
+        all_dialects().run_parser_method(sql, |parser| {
+            let ast = parser.parse_query().unwrap();
+            assert_eq!(ast.to_string(), sql.to_string());
+        });
+
+        let sql = "SELECT * FROM user LIMIT $1 OFFSET $2";
+        let dialects = TestedDialects {
+            dialects: vec![
+                Box::new(PostgreSqlDialect {}),
+                Box::new(ClickHouseDialect {}),
+                Box::new(GenericDialect {}),
+                Box::new(MsSqlDialect {}),
+                Box::new(SnowflakeDialect {}),
+            ],
+        };
+
+        dialects.run_parser_method(sql, |parser| {
+            let ast = parser.parse_query().unwrap();
+            assert_eq!(ast.to_string(), sql.to_string());
+        });
+
+        let sql = "SELECT * FROM user LIMIT ? OFFSET ?";
+        let dialects = TestedDialects {
+            dialects: vec![Box::new(MySqlDialect {})],
+        };
+        dialects.run_parser_method(sql, |parser| {
+            let ast = parser.parse_query().unwrap();
+            assert_eq!(ast.to_string(), sql.to_string());
+        });
+    }
 }