SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function untuple (alias top) (children 1)
            ExpressionList (children 1)
             Function arrayJoin (children 1)
              ExpressionList (children 1)
               Function topKWeightedMerge (children 2)
                ExpressionList (children 1)
                 Identifier top_items
                ExpressionList (children 3)
                 Literal UInt64_100
                 Literal UInt64_3
                 Literal \'counts\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier topk_test
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier top.count
    OrderByElement (children 1)
     Identifier top.item
