SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function arrayEnumerateUniqRanked (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 4)
        Literal \'x Array(Array(String))\'
        Function array (children 1)
         ExpressionList (children 1)
          Function array (children 1)
           ExpressionList
        Literal Array_[Array_[\'a\'], Array_[\'a\'], Array_[\'b\']]
        Literal Array_[Array_[\'a\'], Array_[\'a\'], Array_[\'b\']]