When converting DISTINCT to GROUP BY where the columns are from the covering
index and they are quoted twice in the SELECT list the optimizer is creating
improper processing sequence. This is because of the fact that the columns
of the covering index are not recognized as such and treated as non-index
columns.

Generally speaking duplicate columns can safely be removed from the GROUP
BY/DISTINCT list because this will not add or remove new rows in the
resulting set. Duplicates can be removed even if they are not consecutive
(as is the case for ORDER BY, where the duplicate columns can be removed
only if they are consecutive).

So we can safely transform "SELECT DISTINCT a,a FROM ... ORDER BY a" to
"SELECT a,a FROM ... GROUP BY a ORDER BY a" instead of 
"SELECT a,a FROM .. GROUP BY a,a ORDER BY a". We can even transform 
"SELECT DISTINCT a,b,a FROM ... ORDER BY a,b" to
"SELECT a,b,a FROM ... GROUP BY a,b ORDER BY a,b".

The fix to this bug consists of checking for duplicate columns in the SELECT
list when constructing the GROUP BY list in transforming DISTINCT to GROUP
BY and skipping the ones that are already in.

into mysql.com:/home/hf/work/mysql-5.0.clean

into  zippy.(none):/home/cmiller/work/mysql/mysql-5.0__bug17667

Bug#17667: An attacker has the opportunity to bypass query logging.

This adds a new, local-only printf format specifier to our *printf functions
that allows us to print known-size buffers that must not be interpreted as 
NUL-terminated "strings."

It uses this format-specifier to print to the log, thus fixing this 
problem.

into mysql.com:/Users/kent/mysql/bk/mysql-5.0-new

into  mysql.com:/home/jimw/my/mysql-5.0-clean

  Use "./libtool --mode=execute" to find real path to executables

into mysql.com:/home/hf/work/mysql-5.0.clean

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into  zippy.(none):/home/cmiller/work/mysql/merge/mysql-5.0

into mysql.com:/Users/kent/mysql/bk/mysql-4.1-new

  Fix strange "double" define for popen.
  Avoid warnings about sprintf() etc. being unsafe.
  Corrected typo "#endfif"

  Changed version to 4.1.20

  Backport of changes in 5.0 (bug#18294)

into mysql.com:/Users/kent/mysql/bk/mysql-4.1-new

Now test for NULLness the pointers returned from objects created from the
default value. Pushing patch on behalf of cmiller.

into  devsrv-b.mysql.com:/users/msvensson/mysql-5.0

into mysql.com:/Users/kent/mysql/bk/mysql-5.0-new

  Include and run mysql_upgrade if needed (bug#19353)

into mysql.com:/Users/kent/mysql/bk/mysql-4.1-new

into  devsrv-b.mysql.com:/users/msvensson/mysql-5.0

into  devsrv-b.mysql.com:/users/msvensson/mysql-4.1

 - Eval shrext_cmds variable before using it
 - Moved from acinclude.m4 to openssl.m4 and zlib.m4 when merging 4.1 -> 5.0

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into  devsrv-b.mysql.com:/users/msvensson/mysql-4.1

into  lsmy3.wdf.sap.corp:/data/users/gkodinov/mysql-5.0-B18492

In the code that converts IN predicates to EXISTS predicates it is changing
the select list elements to constant 1. Example :
SELECT ... FROM ...  WHERE a IN (SELECT c FROM ...)
is transformed to :
SELECT ... FROM ... WHERE EXISTS (SELECT 1 FROM ...  HAVING a = c)
However there can be no FROM clause in the IN subquery and it may not be
a simple select : SELECT ... FROM ... WHERE a IN (SELECT f(..) AS
c UNION SELECT ...) This query is transformed to : SELECT ... FROM ...
WHERE EXISTS (SELECT 1 FROM (SELECT f(..) AS c UNION SELECT ...)
x HAVING a = c) In the above query c in the HAVING clause is made to be
an Item_null_helper (a subclass of Item_ref) pointing to the real
Item_field (which is not referenced anywhere else in the query anymore).
This is done because Item_ref_null_helper collects information whether
there are NULL values in the result.  This is OK for directly executed
statements, because the Item_field pointed by the Item_null_helper is
already fixed when the transformation is done.  But when executed as
a prepared statement all the Item instances are "un-fixed" before the
recompilation of the prepared statement. So when the Item_null_helper
gets fixed it discovers that the Item_field it points to is not fixed
and issues an error.  The remedy is to keep the original select list
references when there are no tables in the FROM clause. So the above
becomes : SELECT ... FROM ...  WHERE EXISTS (SELECT c FROM (SELECT f(..)
AS c UNION SELECT ...) x HAVING a = c) In this way c is referenced
directly in the select list as well as by reference in the HAVING
clause. So it gets correctly fixed even with prepared statements.  And
since the Item_null_helper subclass of Item_ref_null_helper is not used
anywhere else it's taken out.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

into mysql.com:/home/hf/work/mysql-5.0.upgd

pushed in 5.0

into  mysql.com:/nfstmp1/jwinstead/mysql-5.0-clean

into  shellback.(none):/home/msvensson/mysql/mysql-5.0

Set LD_LIBRARY_PATH and UDF_EXAMPLE_LIB from $lib_udf_example