add vacuum keyword

codegen/lex/spec.yaml

@@ -201,6 +201,8 @@ Keywords:
     - "USER"
   "USING":
     - "USING"
+  "VACUUM":
+    - "VACUUM"
   "VARIADIC":
     - "VARIADIC"
   "VERBOSE":

lib_test.go

@@ -117,6 +117,8 @@ const TestQuery7 = `
  */
 select concat('one');`
 
+const TestQuery8 = `truncate table pgbench_accounts, pgbench_branches, pgbench_history, pgbench_tellers`
+
 func TestParser_Lex(t *testing.T) {
 	parser := NewParser()
 	lexed := parser.Lex(TestQuery1)
@@ -161,6 +163,12 @@ func TestParser_Lex7(t *testing.T) {
 	t.Errorf("%#v", lexed)
 }
 
+func TestParser_Lex8(t *testing.T) {
+	parser := NewParser()
+	lexed := parser.Lex(TestQuery8)
+	t.Errorf("%+v", lexed)
+}
+
 func BenchmarkParser_Lex(b *testing.B) {
 	b.ReportAllocs()
 	parser := NewParser()