When a view statement is compiled on CREATE VIEW time, most of the 
optimizations should not be done. Finding the right optimization 
for a subquery is one of them.
Unfortunately the optimizer is resolving the column references of 
the left expression of IN subqueries in the process of deciding 
witch optimization to use (if needed). So there should be a 
special case in Item_in_subselect::fix_fields() : check the 
validity of the left expression of IN subqueries in CREATE VIEW 
mode and then proceed as normal. 


mysql-test/r/subselect.result:
  test case
mysql-test/r/view.result:
  chnaged explain due to column being resolved
mysql-test/t/subselect.test:
  test case
sql/item_subselect.cc:
  overloaded fix_fields to fix the left_expr in prepare_view_mode
sql/item_subselect.h:
  fix_fields overloaded so it can prepare left_expr

into  mysql.com:/home/kgeorge/mysql/5.0/B18068


sql/sql_select.cc:
  Auto merged

into  mysql.com:/home/psergey/mysql-5.0-best_access_path_j-push

into  mysql.com:/home/psergey/mysql-5.0-best_access_path_j-push


sql/sql_select.cc:
  Auto merged

into  xiphis.org:/home/antony/work2/mysql-5.0-engines-merge

into  xiphis.org:/home/antony/work2/p1-bug10952.1


sql/handler.h:
  Auto merged
sql/sql_table.cc:
  Auto merged

  "alter table from MyISAM to MERGE lost data without errors and warnings"
  Add new handlerton flag which prevent user from altering table storage
  engine to storage engines which would lose data. Both 'blackhole' and 
  'merge' are marked with the new flag.
  Tests included.


mysql-test/r/blackhole.result:
  test for bug#10952
mysql-test/r/merge.result:
  test for bug#10952
mysql-test/t/blackhole.test:
  test for bug#10952
mysql-test/t/merge.test:
  test for bug#10952
sql/ha_blackhole.cc:
  Bug#10952
    shouldn't be able to alter a table into a blackhole
sql/ha_myisammrg.cc:
  Bug#10952
    shouldn't be able to alter a table into a merge
sql/handler.h:
  Bug#10952
    new handlerton flag
sql/sql_table.cc:
  Bug#10952
    If alter is changing engine, check if new engine allows creating table
    via ALTER statement.

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.


mysql-test/r/distinct.result:
  test case for the bug without loose index scan
mysql-test/r/group_min_max.result:
  test case for the bug
mysql-test/t/distinct.test:
  test case for the bug without loose index scan
mysql-test/t/group_min_max.test:
  test case for the bug
sql/sql_select.cc:
  duplicates check and removal

into  mysql.com:/home/marty/MySQL/mysql-5.0

into  mysql.com:/home/marty/MySQL/mysql-5.0


ndb/src/kernel/blocks/dbtc/DbtcInit.cpp:
  Auto merged

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


sql/item_func.cc:
  Auto merged
sql/sql_acl.cc:
  Auto merged

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


client/mysqltest.c:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
sql/mysql_priv.h:
  Auto merged

No commit message

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


configure.in:
  Auto merged

Add function 'vio_end' that will cleanup resources allocated by vio and the components it uses.


include/violite.h:
  Import patch warnings.patch
libmysql/libmysql.c:
  Import patch warnings.patch
sql/mysqld.cc:
  Import patch warnings.patch
vio/test-ssl.c:
  Import patch warnings.patch
vio/test-sslclient.c:
  Import patch warnings.patch
vio/test-sslserver.c:
  Import patch warnings.patch
vio/vio.c:
  Import patch warnings.patch
vio/viosslfactories.c:
  Import patch warnings.patch

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

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


extra/yassl/src/ssl.cpp:
  Auto merged
extra/yassl/taocrypt/src/make.bat:
  Auto merged
extra/yassl/testsuite/test.hpp:
  Auto merged

into  rurik.mysql.com:/home/igor/mysql-5.0


mysql-test/r/rpl_user_variables.result:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/t/rpl_user_variables.test:
  Manual merge

into  rurik.mysql.com:/home/igor/dev/mysql-5.0-0


mysql-test/r/having.result:
  Auto merged
mysql-test/t/having.test:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged
mysql-test/r/rpl_user_variables.result:
  Manual merge
mysql-test/t/rpl_user_variables.test:
  Manual merge
sql/sql_lex.cc:
  Manual merge
sql/sql_prepare.cc:
  Manual merge
sql/sql_select.cc:
  Manual merge

into  rurik.mysql.com:/home/igor/mysql-4.1

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/Merge/5.0-bug19136


sql/sql_select.cc:
  Auto merged

recalculating results


mysql-test/r/rpl_user_variables.result:
  fixing results

find_best() call best_access_path().

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/Merge/5.0-bug19136


sql/item_func.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/r/rpl_user_variables.result:
  manual merge use local
mysql-test/t/rpl_user_variables.test:
  manual merge use version 5.0's "show binlog events from 98"

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/FIXES/4.1-bug19136_unass_user_var


sql/item_func.cc:
  Auto merged

A query with a group by and having clauses could return a wrong
result set if the having condition contained a constant conjunct 
evaluated to FALSE.
It happened because the pushdown condition for table with
grouping columns lost its constant conjuncts.
Pushdown conditions are always built by the function make_cond_for_table
that ignores constant conjuncts. This is apparently not correct when
constant false conjuncts are present.



mysql-test/r/having.result:
  Added a test case for bug #14927.
mysql-test/t/having.test:
  Added a test case for bug #14927.
sql/sql_lex.cc:
  Fixed bug #14927.
  Initialized fields for having conditions in  st_select_lex::init_query().
sql/sql_lex.h:
  Fixed bug #14927.
  Added a field to restore having condititions for execution in SP and PS.
sql/sql_prepare.cc:
  Fixed bug #14927.
  Added code to restore havinf conditions for execution in SP and PS.
sql/sql_select.cc:
  Fixed bug #14927.
  Performed evaluation of constant expressions in having clauses.
  If the having condition contains a constant conjunct that is always false
  an empty result set is returned after the optimization phase.
  In this case the corresponding EXPLAIN command now returns 
  "Impossible HAVING" in the last column.

into mysql.com:/home/psergey/mysql-5.0-bug16798-merge

into mysql.com:/home/psergey/mysql-4.1-bug16798

into  mysql.com:/home/tomash/src/mysql_ab/mysql-5.0-merge


mysql-test/r/func_misc.result:
  Auto merged
mysql-test/t/func_misc.test:
  Auto merged

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

mysql-test/r/func_misc.result:
  Update the result.

into  mysql.com:/home/mydev/mysql-4.1-bug10405

into  mysql.com:/home/mydev/mysql-5.0-bug10405

into mysql.com:/home/psergey/mysql-4.1-bug16798

into mysql.com:/home/psergey/mysql-5.0-bug16798-merge


sql/sql_select.cc:
  Auto merged

The bug was as follows: When merge_key_fields() encounters "t.key=X OR t.key=Y" it will 
try to join them into ref_or_null access via "t.key=X OR NULL". In order to make this 
inference it checks if Y<=>NULL, ignoring the fact that value of Y may be not yet known.

The fix is that the check if Y<=>NULL is made only if value of Y is known (i.e. it is a
constant).
TODO: When merging to 5.0, replace used_tables() with const_item() everywhere in merge_key_fields().


mysql-test/r/innodb_mysql.result:
  Testcase for BUG16798
mysql-test/t/innodb_mysql.test:
  Testcase for BUG16798
sql/sql_select.cc:
  BUG#16798: Inapplicable ref_or_null query plan and bad query result on random occasions 
  In merge_key_fields() don't call val->is_null() if the value of val is not known.