Remove DO from list of onelineClauses

Author: nene

src/languages/mariadb/mariadb.formatter.ts

@@ -92,7 +92,6 @@ const onelineClauses = expandPhrases([
   'CREATE USER',
   'DEALLOCATE PREPARE',
   'DESCRIBE',
-  'DO',
   'DROP DATABASE',
   'DROP EVENT',
   'DROP FUNCTION',

src/languages/mysql/mysql.formatter.ts

@@ -87,7 +87,6 @@ const onelineClauses = expandPhrases([
   'CREATE USER',
   'DEALLOCATE PREPARE',
   'DESCRIBE',
-  'DO',
   'DROP DATABASE',
   'DROP EVENT',
   'DROP FUNCTION',

src/languages/postgresql/postgresql.formatter.ts

@@ -150,7 +150,6 @@ const onelineClauses = expandPhrases([
   'DEALLOCATE',
   'DECLARE',
   'DISCARD',
-  'DO',
   'DROP ACCESS METHOD',
   'DROP AGGREGATE',
   'DROP CAST',

src/languages/singlestoredb/singlestoredb.formatter.ts

@@ -89,7 +89,6 @@ const onelineClauses = expandPhrases([
   'DESCRIBE',
   'DETACH DATABASE',
   'DETACH PIPELINE',
-  'DO',
   'DROP DATABASE',
   'DROP FUNCTION',
   'DROP INDEX',

test/behavesLikeMariaDbFormatter.ts

@@ -116,4 +116,14 @@ export default function behavesLikeMariaDbFormatter(format: FormatFn) {
         (2, 'Dog');
     `);
   });
+
+  // Regression test for issue #535
+  it('gracefully handles ON CONFLICT .. DO syntax', () => {
+    expect(format(`INSERT INTO tbl VALUES (1,'Blah') ON CONFLICT DO NOTHING;`)).toBe(dedent`
+      INSERT INTO
+        tbl
+      VALUES
+        (1, 'Blah') ON CONFLICT DO NOTHING;
+    `);
+  });
 }