SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Subquery (alias s) (children 1)
     SelectWithUnionQuery (children 1)
      ExpressionList (children 1)
       SelectQuery (children 2)
        ExpressionList (children 1)
         Function quantileState (children 2)
          ExpressionList (children 1)
           Identifier number
          ExpressionList (children 1)
           Literal Float64_0.5
        TablesInSelectQuery (children 1)
         TablesInSelectQueryElement (children 1)
          TableExpression (children 1)
           Subquery (children 1)
            SelectWithUnionQuery (children 1)
             ExpressionList (children 1)
              SelectQuery (children 3)
               ExpressionList (children 1)
                Asterisk
               TablesInSelectQuery (children 1)
                TablesInSelectQueryElement (children 1)
                 TableExpression (children 1)
                  TableIdentifier system.numbers
               Literal UInt64_10
   ExpressionList (children 1)
    Function quantileMerge (children 1)
     ExpressionList (children 1)
      Identifier s
