Allow for list of values in ALTER ROLE .. SET

Fixes #106

Author: nene

src/parser.pegjs

@@ -4566,7 +4566,7 @@ alter_action_with_role_options
   }
 
 alter_action_set_postgresql_option
-  = kw:(SET __) name:(ident __) operator:("=" / TO) value:(__ (expr / keyword)) {
+  = kw:(SET __) name:(ident __) operator:("=" / TO) value:(__ (list$expr / keyword)) {
     return loc({
       type: "alter_action_set_postgresql_option",
       setKw: read(kw),

test/ddl/role.test.ts

@@ -96,6 +96,11 @@ describe("role", () => {
         testWc(`ALTER ROLE ALL IN DATABASE foo SET something TO 128`);
       });
 
+      it(`supports SET parameter TO list,of,values`, () => {
+        testWc(`ALTER ROLE my_role SET something TO 1, 2, 3`);
+        testWc(`ALTER ROLE my_role SET foo = 'a', 'b'`);
+      });
+
       it(`supports SET parameter FROM CURRENT`, () => {
         testWc(`ALTER ROLE my_role SET something FROM CURRENT`);
         testWc(`ALTER ROLE my_role IN DATABASE foo SET something FROM CURRENT`);