SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function toLowCardinality (alias val) (children 1)
     ExpressionList (children 1)
      Identifier z
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (alias z) (children 1)
            ExpressionList (children 1)
             Literal Array_[\'c\', \'d\']
   ExpressionList (children 1)
    Identifier val
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier val