change break loop condition and multiline test query

Author: Dilovan Celik

src/parser/mod.rs

@@ -14489,13 +14489,10 @@ impl<'a> Parser<'a> {
     pub fn parse_merge_clauses(&mut self) -> Result<Vec<MergeClause>, ParserError> {
         let mut clauses = vec![];
         loop {
-            if self.peek_token() == Token::EOF
-                || self.peek_token() == Token::SemiColon
-                || self.peek_keyword(Keyword::OUTPUT)
-            {
+            if !(self.parse_keyword(Keyword::WHEN)) {
                 break;
             }
-            self.expect_keyword_is(Keyword::WHEN)?;
+
 
             let mut clause_kind = MergeClauseKind::Matched;
             if self.parse_keyword(Keyword::NOT) {

tests/sqlparser_mssql.rs

@@ -1924,6 +1924,16 @@ fn ms_and_generic() -> TestedDialects {
 
 #[test]
 fn parse_mssql_merge_with_output() {
-    let stmt = "MERGE dso.products AS t USING dsi.products AS s ON s.ProductID = t.ProductID WHEN MATCHED AND NOT (t.ProductName = s.ProductName OR (ISNULL(t.ProductName, s.ProductName) IS NULL)) THEN UPDATE SET t.ProductName = s.ProductName WHEN NOT MATCHED BY TARGET THEN INSERT (ProductID, ProductName) VALUES (s.ProductID, s.ProductName) WHEN NOT MATCHED BY SOURCE THEN DELETE OUTPUT $action, deleted.ProductID INTO dsi.temp_products";
+    let stmt = "MERGE dso.products AS t\
+        USING dsi.products AS \
+        s ON s.ProductID = t.ProductID \
+        WHEN MATCHED AND \
+        NOT (t.ProductName = s.ProductName OR (ISNULL(t.ProductName, s.ProductName) IS NULL)) \
+        THEN UPDATE SET t.ProductName = s.ProductName \
+        WHEN NOT MATCHED BY TARGET \
+        THEN INSERT (ProductID, ProductName) \
+        VALUES (s.ProductID, s.ProductName) \
+        WHEN NOT MATCHED BY SOURCE THEN DELETE \
+        OUTPUT $action, deleted.ProductID INTO dsi.temp_products";
     ms_and_generic().verified_stmt(stmt);
 }