Order by rowid clause added without my knowledge in Reports gen package

Question

I have a devlp system and a production system.(3.0.9.8.0)
I built a report with lots of decode, sum, roll up, group by
clauses to create a cross table summing matrix report. It ran
correctly in the Devlp Portal system.
I exported it and imported this into the Production system.
Few weeks later I realized that the same report was not working
on the Production system. After some debugging, I noticed in
the generated PLSQL package body there is a if-else block that
basically adds "order by rowid" when the orderby clause is null.
However, the package body on the devlp system does not do
that. The only IF block it has is to determine if it needs to
apply the order by clause or not, no "else"
This additional generated "order by rowid" is breaking the
report because it will not work with my group by query.
My question is - How did that get added into the plsql
package, when I did not check anything to make that happen ??
-Ananth

Answer 1

I am getting similar execution plan on huge data. I cannot post the query here but here is the execution plan:
Execution Plan [with order by clause]
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=22644 Card=4303 Byte
s=3795246)
1 0 COUNT (STOPKEY)
2 1 NESTED LOOPS (OUTER) (Cost=22644 Card=4303 Bytes=3795246 )
3 2 VIEW (Cost=9735 Card=4303 Bytes=2263378)
4 3 SORT (ORDER BY) (Cost=9735 Card=4303 Bytes=529269)
5 4 FILTER
6 5 TABLE ACCESS (FULL) OF 'A' (Cost=9542 Car
d=4303 Bytes=529269)
7 5 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost
=3 Card=1 Bytes=11)
8 7 INDEX (UNIQUE SCAN) OF 'B_PK' (UNIQUE) (
Cost=2 Card=1)
9 5 TABLE ACCESS (BY INDEX ROWID) OF 'A' (Cos
t=5 Card=1 Bytes=14)
10 9 INDEX (RANGE SCAN) OF 'A_X_KEY' (
UNIQUE) (Cost=3 Card=1)
11 5 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost
=3 Card=1 Bytes=11)
12 11 INDEX (UNIQUE SCAN) OF 'B_PK' (UNIQUE) (
Cost=2 Card=1)
13 2 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost=3 Car
d=899140 Bytes=320093840)
14 13 INDEX (RANGE SCAN) OF 'B_XXX_X' (NON-UNIQUE) (
Cost=2 Card=899140)
query 2[ without sort]
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=23349 Card=4303 Byte
s=26592540)
1 0 COUNT (STOPKEY)
2 1 VIEW (Cost=23349 Card=4303 Bytes=26592540)
3 2 SORT (ORDER BY STOPKEY) (Cost=23349 Card=4303 Bytes=20
61137)
4 3 FILTER
5 4 NESTED LOOPS (OUTER) (Cost=22451 Card=4303 Bytes=2 061137)
6 5 TABLE ACCESS (FULL) OF 'A' (Cost=9542 Car
d=4303 Bytes=529269)
7 5 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost
=3 Card=899140 Bytes=320093840)
8 7 INDEX (RANGE SCAN) OF 'B_XXX_X' (NON-UNI
QUE) (Cost=2 Card=899140)
9 4 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost=3
Card=1 Bytes=11)
10 9 INDEX (UNIQUE SCAN) OF 'B_PK' (UNIQUE) (Co
st=2 Card=1)
11 4 TABLE ACCESS (BY INDEX ROWID) OF 'A' (Cost=
5 Card=1 Bytes=14)
12 11 INDEX (RANGE SCAN) OF 'A_X_KEY' (UN
IQUE) (Cost=3 Card=1)
13 4 TABLE ACCESS (BY INDEX ROWID) OF 'B' (Cost=3
Card=1 Bytes=11)
14 13 INDEX (UNIQUE SCAN) OF 'B_PK' (UNIQUE) (Co
st=2 Card=1)