From c6e374f2c9c01e08ec3df81ad548d3b14175a1a7 Mon Sep 17 00:00:00 2001
From: lovasoa <contact@ophir.dev>
Date: Fri, 28 Feb 2025 11:00:47 +0100
Subject: [PATCH] re-add support for nested comments in mssql

fix #1753
---
 src/dialect/mssql.rs     |  5 +++++
 tests/sqlparser_mssql.rs | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/dialect/mssql.rs b/src/dialect/mssql.rs
index 980f5ec3f..aeed1eb79 100644
--- a/src/dialect/mssql.rs
+++ b/src/dialect/mssql.rs
@@ -95,4 +95,9 @@ impl Dialect for MsSqlDialect {
     fn supports_timestamp_versioning(&self) -> bool {
         true
     }
+
+    /// See <https://learn.microsoft.com/en-us/sql/t-sql/language-elements/slash-star-comment-transact-sql?view=sql-server-ver16>
+    fn supports_nested_comments(&self) -> bool {
+        true
+    }
 }
diff --git a/tests/sqlparser_mssql.rs b/tests/sqlparser_mssql.rs
index ec565e50e..3f313af4f 100644
--- a/tests/sqlparser_mssql.rs
+++ b/tests/sqlparser_mssql.rs
@@ -1620,6 +1620,22 @@ fn parse_create_table_with_valid_options() {
     }
 }
 
+#[test]
+fn parse_nested_slash_star_comment() {
+    let sql = r#"
+    select
+    /*
+       comment level 1
+       /*
+          comment level 2
+       */
+    */
+    1;
+    "#;
+    let canonical = "SELECT 1";
+    ms().one_statement_parses_to(sql, canonical);
+}
+
 #[test]
 fn parse_create_table_with_invalid_options() {
     let invalid_cases = vec![