BUG#16217 forced to introduce a separate mysql client command to adopt its

internal charset to one associated with currently being handled query. 
To note such a query can come from interactive client either.

There was a discussion within replication team and Monty who's suggestion won.
It avoids straightforward parsing of all `set' queries that could affect client side 
character set. 
According to the idea, mysql client does not parse `set' queries but rather cares of
`charset new_cs_name' command.
This command is generated by mysqlbinlog in form of exclaiming comment (Lars' suggestion)
so that enlightened clients like `mysql' knows what to do with it.

Interactive human can switch between many multi-byte charsets during the session 
providing the command explicitly. 
To note that setting new internal mysql's charset does not
trigger sending any `SET' sql statement to the server. 


client/mysql.cc:
  BUG#16217 revealed the problem of switching between charsets in mysql client.
  Such switching is necessary in a case when being scanned query consists of 
  multi-byte chars and internal charset was initialized differently. mysql finds 
  `/' escape and misiterprete it 
  while in fact one could be a part of a multi-byte symbol like the bug page reported. 
  
  This patch extends mysql `charset' command, '\C' shortcut.
mysql-test/r/ctype_ucs_binlog.result:
  comment line generated by mysqlbinlog for processing of logs with multi-byte chars.
mysql-test/r/mysql.result:
  results are altered due to #16217
mysql-test/r/mysqlbinlog.result:
  Results are altered due to #16217
mysql-test/r/mysqlbinlog2.result:
  commeted command for mysql client due to multi-byte binlog
mysql-test/r/rpl_charset.result:
  commented command for mysql due to multi-byte binlogs
mysql-test/r/rpl_timezone.result:
  commented command for mysql client due to multi-byte binlogs
mysql-test/r/user_var-binlog.result:
  commented command for mysql client due to multi-byte binlogs
mysql-test/t/mysql.test:
  Main test for mysql client is extended to check `charset' command.
mysql-test/t/mysqlbinlog.test:
  Checking how /*! \C cs_name */ are added to the output of mysqlbinlog.
  The exclaiming comment is for further processing by mysql client.
  The added part mimics the failure to recover tables from binlog - see BUG#16217.
sql/log_event.cc:
  Sending into output instructions for mysql client to switch internally 
  to appropriate charset.
  mysql client is supposed to be invoked with --default-character-set=
  "to default character set of the server created the binlog".

1 files changed, 24 insertions, 1 deletions

diff --git a/mysql-test/r/mysqlbinlog.result b/mysql-test/r/mysqlbinlog.result
index fda69b15fd1..50e4cc28d93 100644
--- a/mysql-test/r/mysqlbinlog.result
+++ b/mysql-test/r/mysqlbinlog.result
@@ -20,6 +20,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 drop table if exists t1,t2;
 SET TIMESTAMP=1000000000;
@@ -50,6 +51,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 insert into t1 values ("Alas");
 # End of log file
@@ -72,6 +74,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 insert into t1 values ("Alas");
 # End of log file
@@ -86,6 +89,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 drop table if exists t1,t2;
 SET TIMESTAMP=1000000000;
@@ -116,6 +120,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 insert into t1 values ("Alas");
 # End of log file
@@ -138,6 +143,7 @@ use test;
 SET TIMESTAMP=1000000000;
 SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
 SET @@session.sql_mode=0;
+/*!\C latin1 */;
 SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
 insert into t1 values ("Alas");
 # End of log file
@@ -166,4 +172,21 @@ insert t1 values (1);
 # End of log file
 ROLLBACK /* added by mysqlbinlog */;
 /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
-drop table t1, t2;
+flush logs;
+create table t3 (f text character set utf8);
+create table t4 (f text character set cp932);
+flush logs;
+rename table t3 to t03, t4 to t04;
+select HEX(f) from t03;
+HEX(f)
+E382BD
+select HEX(f) from t3;
+HEX(f)
+E382BD
+select HEX(f) from t04;
+HEX(f)
+835C
+select HEX(f) from t4;
+HEX(f)
+835C
+drop table t1, t2, t03, t04, t3, t4;