SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function toUInt64OrZero (children 1)
     ExpressionList (children 1)
      Identifier s
    Function toUInt64OrNull (children 1)
     ExpressionList (children 1)
      Identifier s
   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 multiIf (alias s) (children 1)
            ExpressionList (children 3)
             Function equals (children 1)
              ExpressionList (children 2)
               Function modulo (children 1)
                ExpressionList (children 2)
                 Identifier number
                 Literal UInt64_2
               Literal UInt64_1
             Function toString (children 1)
              ExpressionList (children 1)
               Identifier number
             Literal \'hello\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
   Literal UInt64_10