SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function dumpColumnStructure (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 1)
        Identifier a
    Function arrayReduce (children 1)
     ExpressionList (children 3)
      Literal \'sumMap\'
      Function array (children 1)
       ExpressionList (children 1)
        Identifier a
      Function array (children 1)
       ExpressionList (children 1)
        Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Literal Array_[UInt64_1, UInt64_2] (alias a)
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_2