Internal CDT generator giving different results of compilation on successive attempts of compilation

Similar Questions

• CONNECT BY giving different results / duplicate records

  I have a hierarchy like this:

  UserTable-> username, treename_code

  username treename_code

  Scott TREE

  Henry TREE

  TREENAMES-> treename_code

  treename_code

  TREE

  subtree-> id, parent_id, treename_code

  ID parent_id treename_code

  1 null TREE

  2 1 TREE

  select case when connect_by_isleaf = 1 then 0
              when level = 1             then 1
              else                           -1
         end as status, 
         level, 
         subtree.id as value, 
         SYS_CONNECT_BY_PATH(subtree.id, '/') Path
    from usertable,
         treenames,
         subtree
    where upper(usertable.username)=upper(:username)
      and treenames.treename_code=usertable.treename_code
      and subtree.treename_code=treenames.treename_code
    start with subtree.parent_id is null
    connect by subtree.parent_id=prior subtree.id;
  
  

  Database version: 11.2.0.1.0

  According to the user, the order of results is different: we give values:

  1-2-2 (double on '2')

  gives another

  2 1-2 (always double on '2')

  BUT on another database, same version, it gives:

  1-2 (which is expected)

  Any idea?

  This is essentially because of the what the predicate to filter for the USER name is applied. If you are using an Inline view, you will get the desired result.

  Check this. I just simplified your query by removing just the other columns in the select list. But the CONNECT BY and are of the join of the table intact.

  SQL > select subtree.id
  2 usertable,
  3 treenames,
  subtree 4
  5 where upper (usertable.username) = upper ('scott')
  6 and treenames.treename_code = usertable.treename_code
  7 and subtree.treename_code = treenames.treename_code
  8 start
  9 with subtree.parent_id is null
  10 connect
  11 by prior subtree.id = subtree.parent_id;

  ID
  ----------
  2
  1
  2

  SQL > select * from table (dbms_xplan.display_cursor);

  PLAN_TABLE_OUTPUT
  -------------------------------------------------------------------------------------------------
  ----------------------------------------------------------------------------------------
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
  ----------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT |           |       |       |     7 (100) |          |
  |*  1 |  FILTER |           |       |       |            |          |
  |*  2 |   CONNECT BY WITH FILTERING |           |       |       |            |          |
  |*  3 |    HASH JOIN |           |     2.   102.     7 (15) | 00:00:01 |
  |   4.     THE CARTESIAN MERGE JOIN.           |     2.    90.     4 (0) | 00:00:01 |
  |*  5 |      TABLE ACCESS FULL | SUBTREE.     1.    32.     2 (0) | 00:00:01 |
  |   8 2 SORT OF BUFFER.           |     2.    26.     2 (0) | 00:00:01 |
  |   7.       TABLE ACCESS FULL | USERTABLE |     2.    26.     2 (0) | 00:00:01 |
  |   3 ×     TABLE ACCESS FULL | TREENAMES |     1.     8-2-2 (0) | 00:00:01 |
  |*  9 |    HASH JOIN |           |     1.    51.     7 (15) | 00:00:01 |
  |  10.     THE CARTESIAN MERGE JOIN.           |     1.    45.     4 (0) | 00:00:01 |
  | * 11 |      HASH JOIN |           |       |       |            |          |
  |  12.       CONNECT PUMP |           |       |       |            |          |
  |  13.       TABLE ACCESS FULL | SUBTREE.     1.    32.     2 (0) | 00:00:01 |
  |  14.      KIND OF BUFFER.           |     2.    26.     2 (0) | 00:00:01 |
  |  15.       TABLE ACCESS FULL | USERTABLE |     2.    26.     2 (0) | 00:00:01 |
  |  16.     TABLE ACCESS FULL | TREENAMES |     1.     6.     2 (0) | 00:00:01 |
  ----------------------------------------------------------------------------------------

  Information of predicates (identified by the operation identity card):
  ---------------------------------------------------

  1 Filter (SUPERIOR ("USERTABLE".) "USER NAME") = "SCOTT") "
  2 - access("SUBTREE".") PARENT_ID "= NULL PREREQUISITE)
  3 - access("TREENAMES".") TREENAME_CODE '=' USERTABLE '. "" TREENAME_CODE "AND
  "SUBTREE". "" TREENAME_CODE "=" TREENAMES. " ("' TREENAME_CODE")
  5 - filter("SUBTREE".") (PARENT_ID' IS NULL)
  9 - access("TREENAMES".") TREENAME_CODE '=' USERTABLE '. "" TREENAME_CODE "AND
  "SUBTREE". "" TREENAME_CODE "=" TREENAMES. " ("' TREENAME_CODE")
  11 - access("SUBTREE".") PARENT_ID "= NULL PREREQUISITE)

  If you see that the filter for the USER name is applied after that CONNECT BY runs. But if I use a view online. then check it

  SQL > select id
  2 starting at)
  3. Select subtree.id
  4, subtree.parent_id
  5 usertable,
  6 treenames,
  subtree 7
  8 where upper (usertable.username) = upper ('scott')
  9 and treenames.treename_code = usertable.treename_code
  10 and subtree.treename_code = treenames.treename_code
  11          )
  Starter 12
  13 with parent_id is null
  14 connect
  15 by parent_id = prior id;

  ID
  ----------
  1
  2

  SQL > select * from table (dbms_xplan.display_cursor);

  PLAN_TABLE_OUTPUT
  -------------------------------------------------------------------------------------------------
  ---------------------------------------------------------------------------------------
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
  ---------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT |           |       |       |     7 (100) |          |
  |*  1 |  CONNECT BY WITH FILTERING |           |       |       |            |          |
  |*  2 |   HASH JOIN |           |     1.    51.     7 (15) | 00:00:01 |
  |   3.    THE CARTESIAN MERGE JOIN.           |     1.    45.     4 (0) | 00:00:01 |
  |*  4 |     TABLE ACCESS FULL | USERTABLE |     1.    13.     2 (0) | 00:00:01 |
  |   5.     KIND OF BUFFER.           |     1.    32.     2 (0) | 00:00:01 |
  |*  6 |      TABLE ACCESS FULL | SUBTREE.     1.    32.     2 (0) | 00:00:01 |
  |   7.    TABLE ACCESS FULL | TREENAMES |     1.     6.     2 (0) | 00:00:01 |
  |*  8 |   HASH JOIN |           |     1.    51.     7 (15) | 00:00:01 |
  |   9.    THE CARTESIAN MERGE JOIN.           |     1.    45.     4 (0) | 00:00:01 |
  | * 10 |     HASH JOIN |           |       |       |            |          |
  |  11.      CONNECT PUMP |           |       |       |            |          |
  |  12.      TABLE ACCESS FULL | SUBTREE.     1.    32.     2 (0) | 00:00:01 |
  |  13.     KIND OF BUFFER.           |     1.    13.     2 (0) | 00:00:01 |
  | * 14 |      TABLE ACCESS FULL | USERTABLE |     1.    13.     2 (0) | 00:00:01 |
  |  15.    TABLE ACCESS FULL | TREENAMES |     1.     6.     2 (0) | 00:00:01 |
  ---------------------------------------------------------------------------------------

  Information of predicates (identified by the operation identity card):
  ---------------------------------------------------

  1 - access("SUBTREE".") PARENT_ID "= NULL PREREQUISITE)
  2 - access("TREENAMES".") TREENAME_CODE '=' USERTABLE '. "" TREENAME_CODE "AND
  "SUBTREE". "" TREENAME_CODE "=" TREENAMES. " ("' TREENAME_CODE")
  4 filter (SUPERIOR ("USERTABLE".) "USER NAME") = "SCOTT") "
  6 - filter("SUBTREE".") (PARENT_ID' IS NULL)
  8 - access("TREENAMES".") TREENAME_CODE '=' USERTABLE '. "" TREENAME_CODE "AND
  "SUBTREE". "" TREENAME_CODE "=" TREENAMES. " ("' TREENAME_CODE")
  10 - access("SUBTREE".") PARENT_ID "= NULL PREREQUISITE)
  14 filter (SUPERIOR ("USERTABLE".) "USER NAME") = "SCOTT") "

  Here, the filter is applied before CONNECT you IS executed. This is the reason why you get the unexpected result in your query. Use the online mode.

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