SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 6)
    Identifier id
    Identifier source_null
    Identifier except_null
    Function arrayExcept (alias result) (children 1)
     ExpressionList (children 2)
      Identifier source_null
      Identifier except_null
    Identifier expected_null
    Function if (alias status) (children 1)
     ExpressionList (children 3)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier result
        Identifier expected_null
      Literal \'OK\'
      Literal \'NOK\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 3538_array_except4
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier id
