SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function array (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'abc\'
        Literal \'LowCardinality(String)\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'def\'
        Literal \'LowCardinality(FixedString(3))\'
