SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier dummy
    Identifier SumDum
    Identifier ProblemField
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 4)
          ExpressionList (children 3)
           Identifier dummy
           Function sum (alias SumDum) (children 1)
            ExpressionList (children 1)
             Identifier dummy
           Function divide (alias ProblemField) (children 1)
            ExpressionList (children 2)
             Literal UInt64_1
             Identifier SumDum
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.one
          ExpressionList (children 1)
           Identifier dummy
          ExpressionList (children 3)
           OrderByElement (children 1)
            Identifier dummy
           OrderByElement (children 1)
            Identifier SumDum
           OrderByElement (children 1)
            Function CAST (children 1)
             ExpressionList (children 2)
              Function ifNull (children 1)
               ExpressionList (children 2)
                Identifier ProblemField
                Literal Float64_-inf
              Literal \'Float64\'
