Test case for issue reported on user group (doesn't fail)

jOOQ/src/test/java/org/jooq/test/BasicTest.java

@@ -925,6 +925,21 @@ public class BasicTest extends AbstractTest {
         assertEquals("`A`.`b` in ('1', '2')", r_refI().render(c2));
     }
 
+    @Test
+    public void testPlainSQLInPredicate() throws Exception {
+        List<String> v1 = Arrays.asList("1", "2");
+        Condition c1 = field("f").in(v1);
+
+        assertEquals("f in (?, ?)", r_ref().render(c1));
+        assertEquals("f in ('1', '2')", r_refI().render(c1));
+
+        Set<String> v2 = new TreeSet<String>(Arrays.asList("1", "2"));
+        Condition c2 = field("f").in(v2);
+
+        assertEquals("f in (?, ?)", r_ref().render(c2));
+        assertEquals("f in ('1', '2')", r_refI().render(c2));
+    }
+
     @Test
     public void testPlainSQLCondition() throws Exception {
         Condition c1 = condition("TABLE1.ID = 10");