@Parameterized.Parameters public static Collection<Object[]> configs(){
  return Arrays.asList(new Object[][]{{"inner","on","v2",true},{"left","on","v1",true},{"left","on","v2",true}});
}

@ Parameterized . Parameters public static Collection < Object [ ] > configs ( ) { return Arrays . asList ( new Object [ ] [ ] { { "inner" , "on" , "v2" , true } , { "left" , "on" , "v1" , true } , { "left" , "on" , "v2" , true } } ) ; }
return all config combinations , where first setting specifies join type ( inner or left ) , and the second setting specifies whether to force using coprocessors ( on , off or unset ) .
