SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function like (children 1)
     ExpressionList (children 2)
      Literal \'aXb\'
      Literal \'a_b\'
    Function like (children 1)
     ExpressionList (children 2)
      Literal \'aXb\'
      Literal \'a\\\\_b\'
    Function like (children 1)
     ExpressionList (children 2)
      Literal \'a_b\'
      Literal \'a\\\\_b\'
    Function like (children 1)
     ExpressionList (children 2)
      Literal \'a_b\'
      Literal \'a\\\\_b\'
