Allow DB2 identifiers to start with $, @, # chars

Fixes #550

Author: nene

src/languages/db2/db2.formatter.ts

@@ -190,6 +190,7 @@ export const db2: DialectOptions = {
       { quote: "''-raw", prefixes: ['X', 'BX', 'GX', 'UX'], requirePrefix: true },
     ],
     identTypes: [`""-qq`],
+    identChars: { first: '@#$' },
     paramTypes: { positional: true, named: [':'] },
     paramChars: { first: '@#$', rest: '@#$' },
     operators: ['**', '¬=', '¬>', '¬<', '!>', '!<', '||'],

test/db2.test.ts

@@ -89,6 +89,15 @@ describe('Db2Formatter', () => {
     `);
   });
 
+  it('supports @, #, $ characters at the start of identifiers', () => {
+    expect(format(`SELECT @foo, #bar, $zap`)).toBe(dedent`
+      SELECT
+        @foo,
+        #bar,
+        $zap
+    `);
+  });
+
   it('supports @, #, $ characters in named parameters', () => {
     expect(format(`SELECT :foo@bar, :foo#bar, :foo$bar, :@zip, :#zap, :$zop`)).toBe(dedent`
       SELECT