From a7e984099fdded3cbcfbf236a7b800b7ace4252f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20SAISSY?= <remy.saissy@gmail.com>
Date: Thu, 30 Jan 2025 07:50:30 +0100
Subject: [PATCH] Fix DDL generation in case of an empty arguments function.
 (#1690)

---
 src/ast/ddl.rs              | 2 ++
 tests/sqlparser_postgres.rs | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/ast/ddl.rs b/src/ast/ddl.rs
index 1b5ccda2..4fe6b0bb 100644
--- a/src/ast/ddl.rs
+++ b/src/ast/ddl.rs
@@ -2011,6 +2011,8 @@ impl fmt::Display for CreateFunction {
         )?;
         if let Some(args) = &self.args {
             write!(f, "({})", display_comma_separated(args))?;
+        } else {
+            write!(f, "()")?;
         }
         if let Some(return_type) = &self.return_type {
             write!(f, " RETURNS {return_type}")?;
diff --git a/tests/sqlparser_postgres.rs b/tests/sqlparser_postgres.rs
index 9bccda11..5a2f726a 100644
--- a/tests/sqlparser_postgres.rs
+++ b/tests/sqlparser_postgres.rs
@@ -3802,6 +3802,7 @@ fn parse_create_function_detailed() {
     pg_and_generic().verified_stmt("CREATE OR REPLACE FUNCTION add(a INTEGER, IN b INTEGER = 1) RETURNS INTEGER LANGUAGE SQL STABLE PARALLEL UNSAFE RETURN a + b");
     pg_and_generic().verified_stmt("CREATE OR REPLACE FUNCTION add(a INTEGER, IN b INTEGER = 1) RETURNS INTEGER LANGUAGE SQL STABLE CALLED ON NULL INPUT PARALLEL UNSAFE RETURN a + b");
     pg_and_generic().verified_stmt(r#"CREATE OR REPLACE FUNCTION increment(i INTEGER) RETURNS INTEGER LANGUAGE plpgsql AS $$ BEGIN RETURN i + 1; END; $$"#);
+    pg_and_generic().verified_stmt(r#"CREATE OR REPLACE FUNCTION no_arg() RETURNS VOID LANGUAGE plpgsql AS $$ BEGIN DELETE FROM my_table; END; $$"#);
 }
 #[test]
 fn parse_incorrect_create_function_parallel() {