mysql-test/suite/ndb/t/disabled.def:
  disabled failing test in 5.1-bzr
mysql-test/suite/rpl_ndb/t/disabled.def:
  disabled failing test in 5.1-bzr

     
Tables in the table definition cache are keeping a cache buffer for blob
fields which can consume a lot of memory.
    
This patch introduces a maximum size threshold for these buffers.


sql/sql_base.cc:
  Added function free_field_buffers_larger_than to reclaim memory from blob
  field buffers too large to be cached.
sql/table.cc:
  Added function free_field_buffers_larger_than

BUG#37884: rpl_row_basic_2myisam and rpl_row_basic_3innodb fail sporadically in pushbuild
These have been fixed in 5.1-rpl. Re-applying fix for BUG#37884
in 5.1-bugteam, and disabling rpl_flushlog_loop for BUG#37733 in
5.1-bugteam.


mysql-test/extra/rpl_tests/rpl_row_basic.test:
  Missing sync_slave_with_master added.
mysql-test/suite/rpl/t/disabled.def:
  Disabling rpl_flushlog_loop until the fixed version gets
  merged from 5.1-rpl

                  
Range scan in descending order for c <= <col> <= c type of
ranges was ignoring the DESC flag.
However some engines like InnoDB have the primary key parts 
as a suffix for every secondary key.
When such primary key suffix is used for ordering ignoring 
the DESC is not valid.
But we generally would like to do this because it's faster.
            
Fixed by performing only reverse scan if the primary key is used.
Removed some dead code in the process.

mysql-test/r/innodb_mysql.result:
  Bug#37830 : test case
mysql-test/t/innodb_mysql.test:
  Bug#37830 : test case
sql/opt_range.cc:
  Bug#37830 : 
  - preserve and use used_key_parts to
    distinguish when a primary key suffix is used
  - removed some dead code
sql/opt_range.h:
  Bug#37830 : 
  - preserve used_key_parts
  - dead code removed
sql/sql_select.cc:
  Bug#37830 : Do only reverse order traversal
  if the primary key suffix is used.

sql/field.cc:
  Function is only used if replication is compiled in.

Deleted the removed tests.

No commit message

hhunger.

sql/log.cc:
  Auto merge

This does not fix the bug. It only disables the failing test.


mysql-test/suite/rpl/t/disabled.def:
  disable rpl_temporary

If the server failed to expired log files during start up it could crash.

sql/log.cc:
  Added predicate to protect againt cases when current_thd might be NULL.

use thread-local data structures in ha_release_temporary_latches()