The convert_constant_item function converts a constant to integer using
field for condition like 'field = a_constant'. In some cases the
convert_constant_item is called for a subquery when outer select is already
being executed, so convert_constant_item saves field's value to prevent its
corruption. For EXPLAIN and at the prepare phase field's value isn't
initialized yet, thus when convert_constant_item tries to restore saved
value it fails assertion.

Now the convert_constant_item doesn't save/restore field's value if it's
haven't been read yet. Outer constant values are always saved.

mysql-test/r/explain.result:
  Added a test case for the bug#37870.
mysql-test/t/explain.test:
  Added a test case for the bug#37870.
sql/item_cmpfunc.cc:
  Bug#37870: Usage of uninitialized value caused failed assertion.
  Now the convert_constant_item doesn't save/restore field's value if it's
  haven't been read yet. Outer constant values are always saved.

  Bug#39848 events_bugs fails sporadically on pushbuild
            (missing rows in table event_log)
     Details: Reimplement the subtest for BUG 28924
              - check if the number of rows within the table
                event_log changes but don't print rows
                because the number varies depending on
                load on testing box
              - shift DROP USER befor DROP EVENT
                = Subtest fits again to old bug
              - remove no more needed comments + variables
  Bug#39863 events_bugs fails sporadically on pushbuild 
            (extra processes in I_S.PROCESSLIST)
     Details: Abort with appropriate message to the protocol if
              release_lock() does not has the intended effect.
              This cannot prevent problems caused by the probably
              buggy release_lock() but it reveals if we had a
              problem in this area.
  Bug#39978 main.events_bugs does not clean up
     Detail: Restore global.event_scheduler = ON at end of test
  Bug#39569 events_bugs fails sporadically on pushbuild
            (should have failed with errno 1539)
     Detail: Set $wait_timeout to 4 instead of 2
- Fix two instabilities (result sets pulled from processlist in
  subtest for bug 16407) which were found during tests with high
  parallel I/O load
- Minor improvements of formatting
  Details:
  - Add comments
  - Remove tabs and trailing blanks
  - Add line breaks for better readability

updating two test results.

mysql-test/suite/rpl/r/rpl_row_basic_2myisam.result:
  results changed.
mysql-test/suite/rpl_ndb/r/rpl_row_basic_7ndb.result:
  results changed.

correct text describing the --plugin-load option to mysqld

sql/mysqld.cc:
  correct text describing the --plugin-load option to mysqld

The partitioning clause is only a very long single line, which is very
hard to interpret for a human. This patch breaks the partitioning
syntax into one line for the partitioning type, and one line per
partition/subpartition.

mysql-test/r/information_schema_part.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_archive.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_datatype.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_mgm.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_mgm_err.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_not_windows.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_range.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/r/partition_symlink.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/ndb/r/ndb_partition_key.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/ndb/r/ndb_partition_range.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/ndb_team/r/ndb_dd_backuprestore.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/inc/partition_directory.inc:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Changed partitioning clause format for verifying the new output format.
mysql-test/suite/parts/r/ndb_dd_backuprestore.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/part_supported_sql_func_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/part_supported_sql_func_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/part_supported_sql_func_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_1_2_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_1_2_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_1_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_1_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_2_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter1_2_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter2_1_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter2_1_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter2_2_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter2_2_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter3_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter3_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter4_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_alter4_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_archive.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_blackhole.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_memory.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_auto_increment_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_basic_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_basic_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_basic_symlink_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_basic_symlink_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_bit_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_bit_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_bit_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_char_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_char_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_datetime_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_datetime_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_decimal_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_decimal_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_engine_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_engine_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_engine_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_float_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_float_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_int_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_int_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_int_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc0_archive.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc0_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc0_memory.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc0_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc0_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc1_archive.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc1_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc1_memory.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc1_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc1_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc2_archive.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc2_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc2_memory.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc2_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_mgm_lc2_ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_special_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_special_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_syntax_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/partition_syntax_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/parts/r/rpl_partition.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl/r/rpl_extraCol_innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl/r/rpl_extraCol_myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl/r/rpl_innodb_bug28430.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl/r/rpl_row_basic_8partition.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_2innodb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_2myisam.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_dd_partitions.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_extraCol.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_innodb2ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/suite/rpl_ndb/r/rpl_ndb_myisam2ndb.result:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Updated test result due to the new partitioning clause output format.
mysql-test/t/partition.test:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Added small tests for for the new partitioning clause output format.
mysql-test/t/partition_mgm.test:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Added small tests for for the new partitioning clause output format.
sql/sql_partition.cc:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Changed formatting of the partitioning clause from single line into
  multiple indented lines
sql/sql_show.cc:
  Bug#14326: No formatting of partitioning clause in SHOW CREATE TABLE output
  
  Changed formatting of the partitioning clause from single line into
  multiple indented lines

TRUNCATE TABLE for InnoDB tables returned a count showing an approximation
of the number of rows affected to gain efficiency.
Now the statement always returns 0 rows affected for clarity.

sql/sql_delete.cc:
  * Set row count to 0 if auto increment was reset which can happen
  if TRUNCATE TABLE was issued.

a test on the bug page does not reveal the problem with the latest trees.

Adding the test to the rpl suite in order to monitor regression.


mysql-test/extra/rpl_tests/rpl_row_basic.test:
  a regression test for the bug#38230.
mysql-test/suite/rpl/r/rpl_row_basic_3innodb.result:
  results changed.

implicit command which isn't completed immediately.


mysql-test/r/status2.result:
  * Moved disconnect command to avoid race.
mysql-test/t/status2.test:
  * Moved disconnect command to avoid race.

    #ifdef HAVE_purify removed

per-file comments:
  mysql-test/t/partition_not_windows.test
Bug#39102 valgrind build does not compile in realpath, which make DATA/INDEX DIR fail 
    test reenabled

  mysys/my_symlink.c
Bug#39102 valgrind build does not compile in realpath, which make DATA/INDEX DIR fail 
  superfluous ifdef removed, comments fixed

A string buffers which were included in the 'view' data structure
were allocated on the stack, causing an invalid pointer when used
after the function returned.
The fix: use copy of values for view->md5 & view->queries


mysql-test/r/view.result:
  test result
mysql-test/t/view.test:
  test case
sql/sql_view.cc:
  A string buffers which were included in the 'view' data structure
  were allocated on the stack, causing an invalid pointer when used
  after the function returned.
  The fix: use copy of values for view->md5 & view->queries

      
The convert_constant_item function converts a constant to integer using
field for condition like 'field = a_constant'. When the convert_constant_item
is called for a subquery the outer select is already being executed, so
convert_constant_item saves field's value to prevent its corruption.
For EXPLAIN field's value isn't initialized thus when convert_constant_item
tries to restore saved value it fails assertion.
      
Now the convert_constant_item doesn't save/restore field's value
for EXPLAIN.


mysql-test/r/explain.result:
  Added a test case for the bug#37870.
mysql-test/t/explain.test:
  Added a test case for the bug#37870.
sql/item_cmpfunc.cc:
  Bug#37870: Usage of uninitialized value caused failed assertion.
  Now the convert_constant_item doesn't save/restore field's value
  for EXPLAIN.

The abi_check target instroduced as part of WL#4380 verifies
changes to mysql.h. mysql.h in turn includes mysql_version.h.
mysql_version.h is a file that is generated during the configure
phase. We must ensure that mysql_version.h is cleaned only during
distclean and not during clean.

include/Makefile.am:
  This file contains the following changes
  
  1) Moves the cleaning of mysql_version.h from the clean
     phase to the distclean phase.
  
  2) Removes mysql_version.h.in from noinst_HEADERS, this
     entry was reduntant since by virtue of inclusion of
     mysql_version.h mysql_version.h.in is already included.

1. Replace --sleep by wait_* primitive
2. Vertical output for SHOW SLAVE STATUS
3. Updated result file

mysql-test/r/partition_windows.result:
  Update warning number due to new errors appearing earlier
  in the list.
mysql-test/r/windows.result:
  Update warning number due to new errors appearing earlier
  in the list.

mysql-test/r/partition_not_windows.result:
  Update warning number due to new errors appearing earlier
  in the list.
mysql-test/r/partition_symlink.result:
  Update warning number due to new errors appearing earlier
  in the list.
mysql-test/r/symlink.result:
  Update warning number due to new errors appearing earlier
  in the list.

Problem: mysqld doesn't detect that enum data must be reinserted performing
'ALTER TABLE' in some cases.

Fix: reinsert data altering an enum field if enum values are changed.


mysql-test/r/alter_table.result:
  Fix for bug#23113: Different behavior on altering ENUM fields between 5.0 and 5.1
    - test result.
mysql-test/t/alter_table.test:
  Fix for bug#23113: Different behavior on altering ENUM fields between 5.0 and 5.1
    - test case.
sql/field.cc:
  Fix for bug#23113: Different behavior on altering ENUM fields between 5.0 and 5.1
    - Field_enum::is_equal() introduced, which is called to detect that a field
  is changing by 'ALTER TABLE'.
sql/field.h:
  Fix for bug#23113: Different behavior on altering ENUM fields between 5.0 and 5.1
    - Field_enum::is_equal() introduced, which is called to detect that a field
  is changing by 'ALTER TABLE'.