Updated documentation files to reflect MariaDB and not the Maria storage engine or MySQL

Added (rewritten) patch from Percona to get extended statistics in slow.log:
- Added handling of 'set' variables to set_var.cc. Changed sql_mode to use this
- Added extra logging to slow log of 'Thread_id, Schema, Query Cache hit, Rows sent and Rows examined'
- Added optional logging to slow log, through log_slow_verbosity, of query plan statistics
- Added new user variables log_slow_rate_limit, log_slow_verbosity, log_slow_filter
- Added log-slow-file as synonym for 'slow-log-file', as most slow-log variables starts with 'log-slow'
- Added log-slow-time as synonym for long-query-time
Some trivial MyISAM optimizations:
- In prepare for drop, flush key blocks
- Don't call mi_lock_database if my_disable_locking is used

KNOWN_BUGS.txt:
  Updated file to reflect MariaDB and not the Maria storage engine
README:
  Updated file to reflect MariaDB
mysql-test/r/log_slow.result:
  Test new options for slow query log
mysql-test/r/variables.result:
  Updated result (old version cut of things at 79 characters)
mysql-test/t/log_slow.test:
  Test new options for slow query log
sql/Makefile.am:
  Added log_slow.h
sql/event_data_objects.cc:
  Removed not needed test for enable_slow_log (is done when the flag is tested elsewhere)
sql/events.cc:
  Use the general make_set() function instead of 'symbolic_mode_representation'
sql/filesort.cc:
  Added status for used query plans
sql/log.cc:
  Reset counters if no query_length (from Percona's patch; Not sure if needed, but can do no harm)
  Added extra logging to slow log of 'Thread_id, Schema, Query Cache hit, Rows sent and Rows examined'
  Added optional logging to slow log, through log_slow_verbosity, of query plan statistics
  Fixed wrong test of error condition
sql/log_slow.h:
  Defines and variables for log_slow_verbosity and log_slow_filter
sql/mysql_priv.h:
  Include log_slow.h
sql/mysqld.cc:
  Added new user variables log_slow_rate_limit, log_slow_verbosity, log_slow_filter
  Added log-slow-file as synonym for 'slow-log-file', as most slow-log variables starts with 'log-slow'
  Added log-slow-time as synonym for long-query-time
  Added note that one should use log-slow-filter instead of log-slow-admin-statements
  Updated comment from 'slow_query_log_file'
sql/set_var.cc:
  Added long_slow_time as synonym for long_query_time
  Added new user variables log_slow_rate_limit, log_slow_verbosity, log_slow_filter
  dded handling of 'set' variables to set_var.cc. Changed sql_mode to use this
sql/set_var.h:
  - Added handling of 'set' variables. Changed sql_mode to use this
sql/slave.cc:
  Use global filter also for slaves
sql/sp_head.cc:
  Simplify saving of general_slow_log state
  Use the general make_set() function instead of 'symbolic_mode_representation'
sql/sql_cache.cc:
  Added status for used query plans
sql/sql_class.cc:
  Remember/restore query_plan_flags over complex statements
sql/sql_class.h:
  Added variables to handle extended slow log statistics
sql/sql_parse.cc:
  Added status for used query plans
  Added test for filtering slow_query_log
sql/sql_select.cc:
  Added status for used query plans
sql/sql_show.cc:
  Use the general make_set() function instead of 'symbolic_mode_representation'
sql/strfunc.cc:
  Report first error (not last) if something is wrong in a set
  Removed compiler warning
storage/myisam/mi_extra.c:
  In prepare for drop, flush key blocks (speed optimization)
storage/myisam/mi_locking.c:
  Don't call mi_lock_database if my_disable_locking is used (speed optimization)

1 files changed, 60 insertions, 0 deletions

diff --git a/mysql-test/r/log_slow.result b/mysql-test/r/log_slow.result
new file mode 100644
index 00000000000..57d12a64f5a
--- /dev/null
+++ b/mysql-test/r/log_slow.result
@@ -0,0 +1,60 @@
+select @@log_slow_filter;
+@@log_slow_filter
+
+select @@log_slow_rate_limit;
+@@log_slow_rate_limit
+1
+select @@log_slow_verbosity;
+@@log_slow_verbosity
+
+show variables like "log_slow%";
+Variable_name	Value
+log_slow_filter	
+log_slow_queries	ON
+log_slow_rate_limit	1
+log_slow_time	10.000000
+log_slow_verbosity	
+set @@log_slow_filter= "filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk,admin";
+select @@log_slow_filter;
+@@log_slow_filter
+admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk
+set @@log_slow_filter="admin,admin";
+select @@log_slow_filter;
+@@log_slow_filter
+admin
+set @@log_slow_filter=7;
+select @@log_slow_filter;
+@@log_slow_filter
+admin,filesort,filesort_on_disk
+set @@log_slow_filter= "filesort,impossible,impossible2,admin";
+ERROR 42000: Variable 'log_slow_filter' can't be set to the value of 'impossible'
+set @@log_slow_filter= "filesort, admin";
+ERROR 42000: Variable 'log_slow_filter' can't be set to the value of ' admin'
+set @@log_slow_filter= 1<<31;
+ERROR 42000: Variable 'log_slow_filter' can't be set to the value of '2147483648'
+select @@log_slow_filter;
+@@log_slow_filter
+admin,filesort,filesort_on_disk
+set @@log_slow_verbosity= "query_plan,innodb";
+select @@log_slow_verbosity;
+@@log_slow_verbosity
+innodb,query_plan
+set @@log_slow_verbosity=1;
+select @@log_slow_verbosity;
+@@log_slow_verbosity
+innodb
+show fields from mysql.slow_log;
+Field	Type	Null	Key	Default	Extra
+start_time	timestamp	NO		CURRENT_TIMESTAMP	on update CURRENT_TIMESTAMP
+user_host	mediumtext	NO		NULL	
+query_time	time	NO		NULL	
+lock_time	time	NO		NULL	
+rows_sent	int(11)	NO		NULL	
+rows_examined	int(11)	NO		NULL	
+db	varchar(512)	NO		NULL	
+last_insert_id	int(11)	NO		NULL	
+insert_id	int(11)	NO		NULL	
+server_id	int(10) unsigned	NO		NULL	
+sql_text	mediumtext	NO		NULL	
+set @@log_slow_filter=default;
+set @@log_slow_verbosity=default;