Is this a bug or a new behaviour?

Question

SQL> SELECT * FROM V$VERSION;
BANNER
Oracle8i Enterprise Edition Release 8.1.7.4.0 - 64bit Production
PL/SQL Release 8.1.7.4.0 - Production
CORE 8.1.7.0.0 Production
TNS for Solaris: Version 8.1.7.4.0 - Production
NLSRTL Version 3.4.1.0.0 - Production
Elapsed: 00:00:00.00
SQL> SELECT 'X' COL FROM DUAL WHERE 'X' = 'X '
2 /
C
X
Elapsed: 00:00:00.00
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL = Y.COL
4 /
C COL
X X
Elapsed: 00:00:00.00
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL = Y.COL(+)
4 /
C COL
X X
Elapsed: 00:00:00.00
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL(+) = Y.COL
4 /
C COL
X X
Elapsed: 00:00:00.00
SQL> SELECT * FROM V$VERSION;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Solaris: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
Elapsed: 00:00:00.25
SQL> SELECT 'X' COL FROM DUAL WHERE 'X' = 'X '
2 /
C
X
Elapsed: 00:00:00.01
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL = Y.COL
4 /
C COL
X X
Elapsed: 00:00:00.03
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL = Y.COL(+)
4 /
C COL
X
Elapsed: 00:00:00.03
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
3 WHERE X.COL(+) = Y.COL
4 /
C COL
X
Elapsed: 00:00:00.03
SQL> SELECT X.COL, Y.COL FROM
2 (SELECT 'X' COL FROM DUAL) X LEFT OUTER JOIN (SELECT 'X ' COL FROM DUAL) Y
3 ON(X.COL = Y.COL)
4 /
C COL
X
Elapsed: 00:00:00.03
SQL>
Thanks a lot!
Alex

Answer 1

It also appears that 9.2 produces the same results as 10g
Per dbms_utility.db_version the Version = 9.2.0.6.0 Compatibility = 9.2.0
UT1 > @t4
UT1 >
UT1 > SELECT 'X' COL FROM DUAL WHERE 'X' = 'X '
  2  /
C
X
1 row selected.
UT1 >
UT1 > SELECT X.COL, Y.COL FROM
  2   (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
  3   WHERE X.COL = Y.COL
  4  /
C CO
X X
1 row selected.
UT1 >
UT1 > Elapsed: 00:00:00.00
SP2-0734: unknown command beginning "Elapsed: 0..." - rest of line ignored.
UT1 > SELECT X.COL, Y.COL FROM
  2   (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
  3   WHERE X.COL = Y.COL(+)
  4  /
C CO
X
1 row selected.
UT1 >
UT1 > SELECT X.COL, Y.COL FROM
  2  (SELECT 'X' COL FROM DUAL) X, (SELECT 'X ' COL FROM DUAL) Y
  3   WHERE X.COL(+) = Y.COL
  4  /
C CO
  X
1 row selected.HTH -- Mark D Powell --
PS - Also check the settings for nls_comp and nls_sort between the two databases.
Edited by: MarkDPowell on Nov 6, 2008 9:56 PM Add PS