SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier k
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Function uniqState (children 1)
       ExpressionList (children 1)
        Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Function intDiv (alias k) (children 1)
            ExpressionList (children 2)
             Identifier number
             Literal UInt64_3
           Function toNullable (alias x) (children 1)
            ExpressionList (children 1)
             Literal UInt64_1
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_100000
   ExpressionList (children 1)
    Identifier k
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier k
   Literal UInt64_5