Treat ASC,DESC as reserved words in "sql" dialect

Fixes #702

Author: nene

src/languages/sql/sql.keywords.ts

@@ -6,6 +6,7 @@ export const keywords: string[] = [
   'ANY', // <- moved over from functions
   'ARE',
   'AS',
+  'ASC', // Not reserved in SQL-2008, but commonly reserved in most dialects
   'ASENSITIVE',
   'ASYMMETRIC',
   'AT',
@@ -48,6 +49,7 @@ export const keywords: string[] = [
   'DEFAULT',
   'DELETE',
   'DEREF',
+  'DESC', // Not reserved in SQL-2008, but commonly reserved in most dialects
   'DESCRIBE',
   'DETERMINISTIC',
   'DISCONNECT',

test/sql.test.ts

@@ -72,6 +72,20 @@ describe('SqlFormatter', () => {
     ).toThrowError('Parse error: Unexpected "{foo};" at line 2 column 3');
   });
 
+  // Issue #702
+  it('treats ASC and DESC as reserved keywords', () => {
+    expect(format(`SELECT foo FROM bar ORDER BY foo asc, zap desc`, { keywordCase: 'upper' }))
+      .toBe(dedent`
+        SELECT
+          foo
+        FROM
+          bar
+        ORDER BY
+          foo ASC,
+          zap DESC
+      `);
+  });
+
   it('formats ALTER TABLE ... ALTER COLUMN', () => {
     expect(
       format(