SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function mannWhitneyUTest (alias func) (children 1)
     ExpressionList (children 2)
      Identifier salary
      Identifier salary
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 01802_empsalary
