WL#5142 FLUSH LOGS should take optional arguments for which log(s) to flush

Support for flushing individual logs, so that the user can
selectively flush a subset of the server logs.

Flush of individual logs is done according to the 
following syntax:

  FLUSH <log_category> LOGS;

The syntax is extended so that the user is able to flush a
subset of logs:

  FLUSH [log_category LOGS,];

where log_category is one of:
  SLOW
  ERROR
  BINARY
  ENGINE
  GENERAL
  RELAY.


mysql-test/suite/rpl/r/rpl_flush_logs.result:
  Test result for WL#5142.
mysql-test/suite/rpl/t/rpl_flush_logs.test:
  Added the test file to verify if the 'flush individual log' 
  statement works fine.
sql/log.cc:
  Added the two functions to flush slow and general log.
sql/sql_parse.cc:
  Added code to flush specified logs against the option.
sql/sql_yacc.yy:
  Added code to parse the 'flush * log' statement syntax and 
  set its option to Lex->type.

mysql-test/suite/rpl/r/rpl_flush_logs.result

@@ -0,0 +1,67 @@
+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+# Make sure the 'master_log.err-old' file does not
+# exist before execute 'flush error logs' statement.
+# Test if support 'flush error logs' statement.
+flush error logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush error logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush error logs' statement.
+# Make sure relay logs was not be flushed 
+# after execute 'flush error logs' statement.
+# Make sure the 'slave-relay-bin.000004' file does not
+# exist before execute 'flush relay logs' statement.
+# Test if support 'flush relay logs' statement.
+flush relay logs;
+# Check the 'slave-relay-bin.000004' file is created
+# after executed 'flush relay logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush relay logs' statement.
+# Test if support 'flush slow logs' statement.
+flush slow logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush slow logs' statement.
+# Test if support 'flush general logs' statement.
+flush general logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush general logs' statement.
+# Test if support 'flush engine logs' statement.
+flush engine logs;
+# Make sure binary logs was not be flushed
+# after execute 'flush engine logs' statement.
+# Make sure the 'master-bin.000002' file does not
+# exist before execute 'flush binary logs' statement.
+# Test if support 'flush binary logs' statement.
+flush binary logs;
+# Check the 'master-bin.000002' file is created
+# after executed 'flush binary logs' statement.
+# Make sure the 'slave-relay-bin.000007' file does not exist
+# exist before execute 'flush error logs, relay logs' statement.
+# Make sure the 'master_log.err-old' file does not exist
+# before execute 'flush error logs, relay logs' statement.
+# Test if support to combine all kinds of logs into one statement.
+flush error logs, relay logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush error logs, relay logs' statement.
+# Make sure binary logs was not be flushed
+# after execute 'flush error logs, relay logs' statement.
+# Check the 'slave-relay-bin.000007' file is created after
+# execute 'flush error logs, relay logs' statement.
+# Make sure the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+# files do not exist before execute 'flush error logs, relay logs' 
+# statement.
+# Make sure the 'master_log.err-old' file does not exist
+# before execute 'flush logs' statement.
+# Test if 'flush logs' statement works fine and flush all the logs.
+flush logs;
+# Check the 'master_log.err-old' file is created
+# after executed 'flush logs' statement.
+# Check 'master-bin.000003' is created
+# after execute 'flush logs' statement.
+# Check the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+# files are created after execute 'flush logs' statement.

mysql-test/suite/rpl/t/rpl_flush_logs-master.opt

@@ -0,0 +1 @@
+--log-error=$MYSQLTEST_VARDIR/tmp/master_log.err

mysql-test/suite/rpl/t/rpl_flush_logs.test

@@ -0,0 +1,172 @@
+#
+# WL#5124
+# This test verifies if the 'flush individual logs' statement 
+# works fine.  
+#
+
+--source include/master-slave.inc
+--source include/have_binlog_format_statement.inc
+connection master;
+
+# Test 'flush error logs' statement.
+--echo # Make sure the 'master_log.err-old' file does not
+--echo # exist before execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if support 'flush error logs' statement.
+flush error logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush error logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+sync_slave_with_master;
+--echo # Make sure relay logs was not be flushed 
+--echo # after execute 'flush error logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+
+# Test 'flush relay logs' statement.
+--echo # Make sure the 'slave-relay-bin.000004' file does not
+--echo # exist before execute 'flush relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+connection master;
+--echo # Test if support 'flush relay logs' statement.
+flush relay logs;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000004' file is created
+--echo # after executed 'flush relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000004;
+
+connection master;
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush slow logs' statement.
+--echo # Test if support 'flush slow logs' statement.
+flush slow logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush slow logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush general logs' statement.
+--echo # Test if support 'flush general logs' statement.
+flush general logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush general logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush engine logs' statement.
+--echo # Test if support 'flush engine logs' statement.
+flush engine logs;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush engine logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+
+# Test 'flush binary logs' statement.
+--echo # Make sure the 'master-bin.000002' file does not
+--echo # exist before execute 'flush binary logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+
+--echo # Test if support 'flush binary logs' statement.
+flush binary logs;
+
+--echo # Check the 'master-bin.000002' file is created
+--echo # after executed 'flush binary logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000002;
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000001;
+
+
+# Test 'flush error logs, relay logs' statement
+sync_slave_with_master;
+--echo # Make sure the 'slave-relay-bin.000007' file does not exist
+--echo # exist before execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000007;
+
+connection master;
+remove_file $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Make sure the 'master_log.err-old' file does not exist
+--echo # before execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if support to combine all kinds of logs into one statement.
+flush error logs, relay logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush error logs, relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Make sure binary logs was not be flushed
+--echo # after execute 'flush error logs, relay logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000003;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000007' file is created after
+--echo # execute 'flush error logs, relay logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000007;
+
+
+# Test 'flush logs' statement
+--echo # Make sure the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+--echo # files do not exist before execute 'flush error logs, relay logs' 
+--echo # statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000008;
+--error 1
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000009;
+
+connection master;
+remove_file $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Make sure the 'master_log.err-old' file does not exist
+--echo # before execute 'flush logs' statement.
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+
+--echo # Test if 'flush logs' statement works fine and flush all the logs.
+flush logs;
+
+--echo # Check the 'master_log.err-old' file is created
+--echo # after executed 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err-old;
+file_exists $MYSQLTEST_VARDIR/tmp/master_log.err;
+
+--echo # Check 'master-bin.000003' is created
+--echo # after execute 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.1/data/master-bin.000003;
+
+sync_slave_with_master;
+--echo # Check the 'slave-relay-bin.000008' and 'slave-relay-bin.000009' 
+--echo # files are created after execute 'flush logs' statement.
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000008;
+file_exists $MYSQLTEST_VARDIR/mysqld.2/data/slave-relay-bin.000009;
+