workaround for odciaggregate bug?

From: Stauffer, Robert G <rstauffer_at_decommunications.com>
Date: Fri, 23 Jan 2009 16:57:58 -0500
Message-ID: <DBD57944BD147146A3FA5E66983322E4088C3A6C_at_CL-EXCHANGE1.dande.com>

All,

9.2.0.7 and 10.1.0.4 on AIX 5.2

I'm trying to use ODCIAggregate and Tom Kyte's stringAgg function to concatenate a number in multiple rows into a string. Below is the output of the select statements I ran. Create scripts for the table, type, and function are below the output. I'm expecting the returned string to be '010203' but it returns '010032'. Unfortunately, it looks like there's a bug (7194959 to be fixed in 11.2) in ODCIAggregate that "unsorts" the sorted data when it creates the concatenated string. I've looked around (asktom, metalink, etc.) and can't seem to find a work-around for this method. Has anyone come up with one?

SQL> select acctnbr, snapshotdate, prodcount from testtable;

ACCTNBR SNAPSHOTDATE PRODCOUNT

---------- ------------------- ----------
0123456789 01/22/2009 15:15:29          3
0123456789 01/21/2009 15:15:40          0
0123456789 01/20/2009 15:15:45          2
0123456789 01/19/2009 15:15:48          0
0123456789 01/18/2009 15:16:06          1
0123456789 01/17/2009 15:16:11          0

6 rows selected.

SQL> select acctnbr, snapshotdate, prodcount from testtable order by acctnbr, snapshotdate;

ACCTNBR SNAPSHOTDATE PRODCOUNT

---------- ------------------- ----------
0123456789 01/17/2009 15:16:11          0
0123456789 01/18/2009 15:16:06          1
0123456789 01/19/2009 15:15:48          0
0123456789 01/20/2009 15:15:45          2
0123456789 01/21/2009 15:15:40          0
0123456789 01/22/2009 15:15:29          3

6 rows selected.

SQL> col countstring form a30
SQL> select acctnbr, stringAgg(prodcount) countstring   2 from (select acctnbr, snapshotdate, prodcount from testtable order by acctnbr, snapshotdate)
  3 group by acctnbr;

ACCTNBR COUNTSTRING

---------- ------------------------------

0123456789 010032

SQL>

---

CREATE TABLE TESTTABLE (

  SNAPSHOTDATE  DATE          NOT NULL,
  ACCTNBR       VARCHAR2(10)  NOT NULL,
  PRODCOUNT     INTEGER       NOT NULL

)
/
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/22/2009 15:15:29','MM/DD/YYYY HH24:MI:SS'),'0123456789',3);
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/21/2009 15:15:40','MM/DD/YYYY HH24:MI:SS'),'0123456789',0);
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/20/2009 15:15:45','MM/DD/YYYY HH24:MI:SS'),'0123456789',2);
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/19/2009 15:15:48','MM/DD/YYYY HH24:MI:SS'),'0123456789',0);
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/18/2009 15:16:06','MM/DD/YYYY HH24:MI:SS'),'0123456789',1);
Insert into TESTTABLE (SNAPSHOTDATE, ACCTNBR, PRODCOUNT) Values
(TO_DATE('01/17/2009 15:16:11','MM/DD/YYYY HH24:MI:SS'),'0123456789',0);
create or replace type StringAggType as object (theString varchar2(4000),
  static function ODCIAggregateInitialize (sctx IN OUT StringAggType ) return number,
  member function ODCIAggregateIterate (self IN OUT StringAggType,

value IN varchar2                        ) return number,

  member function ODCIAggregateTerminate (self IN StringAggType, returnValue OUT varchar2, flags IN number) return number,

  member function ODCIAggregateMerge      (self IN OUT StringAggType,
ctx2 IN StringAggType                    ) return number

);
/
create or replace type body StringAggType is   static function ODCIAggregateInitialize(sctx IN OUT StringAggType) return number is
  begin

      dbms_output.put_line('initializing ...');
      sctx := StringAggType( null );
      return ODCIConst.Success;

  end;
  member function ODCIAggregateIterate(self IN OUT StringAggType, value IN varchar2) return number is
  begin

      self.theString := theString || value;
      dbms_output.put_line('iteration result '||self.theString||' ...');
      return ODCIConst.Success;

  end;
  member function ODCIAggregateTerminate(self IN StringAggType, returnValue OUT varchar2, flags IN number) return number is   begin

      returnValue := self.theString;
      dbms_output.put_line('terminating '||returnValue||' ...');
      return ODCIConst.Success;

  end;
  member function ODCIAggregateMerge(self IN OUT StringAggType, ctx2 IN StringAggType) return number is
  begin

      dbms_output.put_line('merging ...');
      self.theString := self.theString || ctx2.theString;
      return ODCIConst.Success;

  end;
end;
/
CREATE or replace FUNCTION stringAgg(input varchar2 ) RETURN varchar2
PARALLEL_ENABLE AGGREGATE USING StringAggType; /
select acctnbr, snapshotdate, prodcount from testtable; select acctnbr, snapshotdate, prodcount from testtable order by acctnbr, snapshotdate;
col countstring form a30
select acctnbr, stringAgg(prodcount) countstring from (select acctnbr, snapshotdate, prodcount from testtable order by acctnbr, snapshotdate)
group by acctnbr;

Bob Stauffer
DBA
D&E Communications
Ephrata, PA
rstauffer_at_decommunications.com
717-738-8737

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Received on Fri Jan 23 2009 - 15:57:58 CST