BUG: Fetching from a Cursor with Existence Clause May Cause an Access Violation

MORE INFORMATION

   USE pubs
   GO

   PRINT 'The following processes will test WITHOUT an index on
   titleauthors'
   PRINT 'Dropping constrainst on titleauthor table'
   alter table titleauthor drop constraint UPKCL_taind
   alter table titleauthor drop constraint FK__titleauth__title__14070484
   PRINT 'Dropping index on titleauthor table'
   drop index titleauthor.auidind
   drop index titleauthor.titleidind
   go

   ------------------------------------------------------------------------
   -- Executing the query with a WHERE EXISTS on dynamic forward only
   -- cursor
   ------------------------------------------------------------------------
   PRINT 'Executing the base query a dynamic forward only cursor'
   DECLARE avtest CURSOR FOR
   SELECT   au_lname
           , au_fname
   FROM    authors a
          , titleauthor ta
   WHERE
           a.au_id = ta.au_id
           AND
         EXISTS -- OR use NOT EXISTS
         (
            SELECT   *
            FROM   publishers p
            WHERE    a.city = p.city
         )
   DECLARE @count int
   SELECT @count = 0

   OPEN avtest
   FETCH NEXT FROM avtest
   WHILE (@@FETCH_STATUS <> -1)
   BEGIN
      FETCH NEXT FROM avtest
      select @count = @count + 1
   END
   CLOSE avtest
   DEALLOCATE avtest
   select @count

   PRINT 'Please run the instpubs.sql script to reinstall the pubs
   database'