message: Allow VALUES list without brackets with non-optional alias
diff: @@ -835,6 +835,15 @@ table_ref: relation_expr opt_alias_clause opt_tablesample_clause
  n->sample = $3;
  $$ = (PGNode *) n;
  }
  + | values_clause_opt_comma alias_clause opt_tablesample_clause
  + {
  + PGRangeSubselect *n = makeNode(PGRangeSubselect);
  + n->lateral = false;
  + n->subquery = $1;
  + n->alias = $2;
  + n->sample = $3;
  + $$ = (PGNode *) n;
  + }
  | LATERAL_P func_table func_alias_clause
  {
  PGRangeFunction *n = (PGRangeFunction *) $2;
  