Due to merges.

dbug/dbug.c

@@ -2407,4 +2407,13 @@ int i_am_a_dummy_function() {
        return 0;
 }
 
+#ifdef __WIN__
+char _db_doprnt_;
+char _db_enter_;
+char _db_pargs_;
+char _db_process_;
+char _db_push_;
+char _db_return_;
+#endif /*__WIN__*/
+
 #endif

extra/yassl/src/cert_wrapper.cpp

@@ -265,7 +265,7 @@ int CertManager::Validate()
         TaoCrypt::CertDecoder cert(source, true, &signers_, verifyNone_);
 
         int err = cert.GetError().What();
-        if ( err && err != TaoCrypt::SIG_OTHER_E)
+        if ( err )
             return err;
 
         uint sz = cert.GetPublicKey().size();

include/my_dbug.h

@@ -108,6 +108,22 @@ extern FILE *_db_fp_(void);
 #define DBUG_EXPLAIN(buf,len)
 #define DBUG_EXPLAIN_INITIAL(buf,len)
 #define IF_DBUG(A)
+
+#ifdef __WIN__
+/*
+   On windows all the dll export has to be declared in the *.def file
+   so as we export these symbols in DEBUG mode we have to export
+   these in the RELEASE mode also. So below are the dummy symbols
+   for the RELEASE export
+*/
+extern  char _db_doprnt_;
+extern  char _db_enter_;
+extern  char _db_pargs_;
+extern  char _db_process_;
+extern  char _db_push_;
+extern  char _db_return_;
+#endif /*__WIN__*/
+
 #endif
 #ifdef	__cplusplus
 }

include/my_global.h

@@ -18,11 +18,6 @@
 #ifndef _global_h
 #define _global_h
 
-#ifndef EMBEDDED_LIBRARY
-#define HAVE_REPLICATION
-#define HAVE_EXTERNAL_CLIENT
-#endif
-
 /*
   InnoDB depends on some MySQL internals which other plugins should not
   need.  This is because of InnoDB's foreign key support, "safe" binlog
@@ -101,6 +96,11 @@
 #endif
 #endif /* !EMBEDDED_LIBRARY */
 
+#ifndef EMBEDDED_LIBRARY
+#define HAVE_REPLICATION
+#define HAVE_EXTERNAL_CLIENT
+#endif
+
 /* Some defines to avoid ifdefs in the code */
 #ifndef NETWARE_YIELD
 #define NETWARE_YIELD

libmysqld/examples/CMakeLists.txt

@@ -29,13 +29,13 @@ ADD_DEFINITIONS(-DEMBEDDED_LIBRARY)
 ADD_EXECUTABLE(mysql_embedded ../../client/completion_hash.cc
                ../../client/mysql.cc ../../client/readline.cc
                ../../client/sql_string.cc)
-TARGET_LINK_LIBRARIES(mysql_embedded mysys yassl taocrypt zlib debug dbug regex strings wsock32)
+TARGET_LINK_LIBRARIES(mysql_embedded wsock32)
 ADD_DEPENDENCIES(mysql_embedded libmysqld)
 
 ADD_EXECUTABLE(mysqltest_embedded ../../client/mysqltest.c)
-TARGET_LINK_LIBRARIES(mysqltest_embedded mysys yassl taocrypt zlib debug dbug regex strings wsock32)
+TARGET_LINK_LIBRARIES(mysqltest_embedded wsock32)
 ADD_DEPENDENCIES(mysqltest_embedded libmysqld)
 
 ADD_EXECUTABLE(mysql_client_test_embedded ../../tests/mysql_client_test.c)
-TARGET_LINK_LIBRARIES(mysql_client_test_embedded debug dbug mysys yassl taocrypt zlib strings wsock32)
+TARGET_LINK_LIBRARIES(mysql_client_test_embedded wsock32)
 ADD_DEPENDENCIES(mysql_client_test_embedded libmysqld)

libmysqld/libmysqld.def

@@ -2,6 +2,66 @@ LIBRARY		LIBMYSQLD
 DESCRIPTION	'MySQL 5.1 Embedded Server Library'
 VERSION		5.1
 EXPORTS
+	_db_process_
+	_db_enter_
+	_db_return_
+	_db_push_
+	_db_doprnt_
+	_db_pargs_
+	strnmov
+	get_charset
+	my_memmem
+	my_snprintf
+	pthread_exit
+	pthread_cond_signal
+	dynstr_append_mem
+	init_dynamic_string
+	dynstr_free
+	my_hash_free
+	my_vsnprintf
+	dynstr_append
+	my_close
+	my_open
+	dynstr_set
+	dynstr_append_os_quoted
+	my_delete
+	my_seek
+	my_write
+	create_temp_file
+	fn_format
+	dirname_part
+	my_hash_insert
+	my_hash_search
+	test_if_hard_path
+	my_copy
+	my_mkdir
+	my_sleep
+	my_strtod
+	pthread_cond_wait
+	my_strnncoll_simple
+	get_dynamic
+	my_regerror
+	init_dynamic_array2
+	pthread_create
+	pthread_cond_init
+	my_regcomp
+	my_regexec
+	my_regex_end
+	my_regfree
+	longlong2str
+	my_set_exception_pointers
+	my_print_stacktrace
+	my_thread_stack_size
+	my_safe_print_str
+	my_stat
+	_my_hash_init
+	pthread_attr_setstacksize
+	pthread_attr_init
+	my_dirend
+	wild_compare
+	my_dir
+	my_micro_time
+	find_type_or_exit
 	_dig_vec_upper
 	_dig_vec_lower
 	bmove_upp

mysql-test/r/ctype_utf8.result

@@ -1848,3 +1848,35 @@ select hex(_utf8 B'001111111111');
 ERROR HY000: Invalid utf8 character string: 'FF'
 select (_utf8 X'616263FF');
 ERROR HY000: Invalid utf8 character string: 'FF'
+CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL);
+INSERT INTO t1 VALUES (70000, 1092), (70001, 1085), (70002, 1065);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+CONVERT(a, CHAR)	CONVERT(b, CHAR)
+70002	1065
+70001	1085
+70000	1092
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1;
+CONVERT(a, CHAR)	CONVERT(b, CHAR)
+70000	1092
+70001	1085
+70002	1065
+ALTER TABLE t1 ADD UNIQUE (b);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+CONVERT(a, CHAR)	CONVERT(b, CHAR)
+70002	1065
+70001	1085
+70000	1092
+DROP INDEX b ON t1;
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+CONVERT(a, CHAR)	CONVERT(b, CHAR)
+70002	1065
+70001	1085
+70000	1092
+ALTER TABLE t1 ADD INDEX (b);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) from t1 GROUP BY b;
+CONVERT(a, CHAR)	CONVERT(b, CHAR)
+70002	1065
+70001	1085
+70000	1092
+DROP TABLE t1;
+End of 5.0 tests

mysql-test/r/func_compress.result

@@ -68,7 +68,7 @@ Warnings:
 Error	1259	ZLIB: Input data corrupted
 Error	1256	Uncompressed data size too large; the maximum size is 1048576 (probably, length of uncompressed data was corrupted)
 drop table t1;
-set @@max_allowed_packet=1048576*100;
+set @@global.max_allowed_packet=1048576*100;
 select compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null;
 compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null
 0

mysql-test/r/max_allowed_packet_basic.result

@@ -2,10 +2,7 @@ SET @start_global_value = @@global.max_allowed_packet;
 SELECT @start_global_value;
 @start_global_value
 1048576
-SET @start_session_value = @@session.max_allowed_packet;
-SELECT @start_session_value;
-@start_session_value
-1048576
+SET @@global.max_allowed_packet = DEFAULT;
 '#--------------------FN_DYNVARS_070_01-------------------------#'
 SET @@global.max_allowed_packet = 1000;
 Warnings:
@@ -15,7 +12,9 @@ SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1048576
 SET @@session.max_allowed_packet = 20000;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SET @@session.max_allowed_packet = DEFAULT;
+ERROR 42000: Variable 'max_allowed_packet' doesn't have a default value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
 1048576
@@ -24,10 +23,6 @@ SET @@global.max_allowed_packet = DEFAULT;
 SELECT @@global.max_allowed_packet = 1048576;
 @@global.max_allowed_packet = 1048576
 1
-SET @@session.max_allowed_packet = DEFAULT;
-SELECT @@session.max_allowed_packet = 1048576;
-@@session.max_allowed_packet = 1048576
-1
 '#--------------------FN_DYNVARS_070_03-------------------------#'
 SET @@global.max_allowed_packet = 1024;
 SELECT @@global.max_allowed_packet;
@@ -48,25 +43,30 @@ SELECT @@global.max_allowed_packet;
 1073740800
 '#--------------------FN_DYNVARS_070_04-------------------------#'
 SET @@session.max_allowed_packet = 1024;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
 SET @@session.max_allowed_packet = 1025;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
 SET @@session.max_allowed_packet = 65535;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-64512
+1048576
 SET @@session.max_allowed_packet = 1073741824;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1073741824
+1048576
 SET @@session.max_allowed_packet = 1073741823;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1073740800
+1048576
 '#------------------FN_DYNVARS_070_05-----------------------#'
 SET @@global.max_allowed_packet = 0;
 Warnings:
@@ -103,37 +103,33 @@ SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1073741824
 SET @@session.max_allowed_packet = 0;
-Warnings:
-Warning	1292	Truncated incorrect max_allowed_packet value: '0'
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
 SET @@session.max_allowed_packet = 1023;
-Warnings:
-Warning	1292	Truncated incorrect max_allowed_packet value: '1023'
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
 SET @@session.max_allowed_packet = -2;
-Warnings:
-Warning	1292	Truncated incorrect max_allowed_packet value: '0'
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
 SET @@session.max_allowed_packet = 65530.34.;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.' at line 1
 SET @@session.max_allowed_packet = 10737418241;
-Warnings:
-Warning	1292	Truncated incorrect max_allowed_packet value: '10737418241'
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1073741824
+1048576
 'Bug # 34837: Errors are not coming on assigning invalid values to variable';
 SET @@session.max_allowed_packet = test;
 ERROR 42000: Incorrect argument type to variable 'max_allowed_packet'
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1073741824
+1048576
 '#------------------FN_DYNVARS_070_06-----------------------#'
 SELECT @@global.max_allowed_packet = VARIABLE_VALUE 
 FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
@@ -166,6 +162,7 @@ SELECT @@max_allowed_packet = @@global.max_allowed_packet;
 0
 '#---------------------FN_DYNVARS_070_10----------------------#'
 SET @@max_allowed_packet = 100000;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@max_allowed_packet = @@local.max_allowed_packet;
 @@max_allowed_packet = @@local.max_allowed_packet
 1
@@ -174,9 +171,10 @@ SELECT @@local.max_allowed_packet = @@session.max_allowed_packet;
 1
 '#---------------------FN_DYNVARS_070_11----------------------#'
 SET max_allowed_packet = 1024;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@max_allowed_packet;
 @@max_allowed_packet
-1024
+1048576
 SELECT local.max_allowed_packet;
 ERROR 42S02: Unknown table 'local' in field list
 SELECT session.max_allowed_packet;
@@ -187,7 +185,6 @@ SET @@global.max_allowed_packet = @start_global_value;
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1048576
-SET @@session.max_allowed_packet = @start_session_value;
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
 1048576

mysql-test/r/max_allowed_packet_func.result

@@ -10,24 +10,15 @@ name BLOB
 '#--------------------FN_DYNVARS_070_01-------------------------#'
 ## Setting value of max_allowed packet and net_buffer_length to 1024 ## 
 SET @@session.max_allowed_packet = 1024;
-SET @@session.net_buffer_length = 1024;
+ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.max_allowed_packet;
 @@session.max_allowed_packet
-1024
+1048576
+SET @@session.net_buffer_length = 1024;
+ERROR HY000: SESSION variable 'net_buffer_length' is read-only. Use SET GLOBAL to assign the value
 SELECT @@session.net_buffer_length;
 @@session.net_buffer_length
-1024
-## Inserting and fetching data of length greater than 1024 ##
-INSERT into t1(name) values("aaassssssssddddddddffffffgggggggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
-SELECT length("aaaaaasssssssssssdddddddfffffgggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk") as len;
-len
-1470
-## Verifying record in table t1 ##
-SELECT * from t1;
-id	name
-1	aaassssssssddddddddffffffgggggggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
-'Bug#35381: Error is not coming on inserting and fetching data of length'
-'greater than max_allowed_packet size at session level';
+16384
 '#--------------------FN_DYNVARS_070_02-------------------------#'
 ## Setting value of max_allowed packet and net_buffer_length to 1024 ## 
 SET @@global.max_allowed_packet = 1024;

mysql-test/r/net_buffer_length_basic.result

 SET @start_global_value = @@global.net_buffer_length;
-SET @start_session_value = @@session.net_buffer_length;
+SET @@global.net_buffer_length = DEFAULT;
 '#--------------------FN_DYNVARS_109_01-------------------------#'
 SET @@global.net_buffer_length = 10000;
 SET @@global.net_buffer_length = DEFAULT;
@@ -7,7 +7,9 @@ SELECT @@global.net_buffer_length;
 @@global.net_buffer_length
 16384
 SET @@session.net_buffer_length = 20000;
+ERROR HY000: SESSION variable 'net_buffer_length' is read-only. Use SET GLOBAL to assign the value
 SET @@session.net_buffer_length = DEFAULT;
+ERROR 42000: Variable 'net_buffer_length' doesn't have a default value
 SELECT @@session.net_buffer_length;
 @@session.net_buffer_length
 16384
@@ -16,10 +18,6 @@ SET @@global.net_buffer_length = DEFAULT;
 SELECT @@global.net_buffer_length = 16384;
 @@global.net_buffer_length = 16384
 1
-SET @@session.net_buffer_length = DEFAULT;
-SELECT @@session.net_buffer_length = 16384;
-@@session.net_buffer_length = 16384
-1
 '#--------------------FN_DYNVARS_109_03-------------------------#'
 SET @@global.net_buffer_length = 1024;
 SELECT @@global.net_buffer_length;
@@ -43,27 +41,6 @@ SELECT @@global.net_buffer_length;
 64512
 'Bug# 34877: Invalid Values are coming in variable on assigning valid values';
 '#--------------------FN_DYNVARS_109_04-------------------------#'
-SET @@session.net_buffer_length = 1024;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1024
-SET @@session.net_buffer_length = 1025;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1024
-SET @@session.net_buffer_length = 1048576;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1048576
-SET @@session.net_buffer_length = 1048575;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1047552
-SET @@session.net_buffer_length = 65535;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-64512
-'Bug# 34877: Invalid Values are coming in variable on assigning valid values';
 '#------------------FN_DYNVARS_109_05-----------------------#'
 SET @@global.net_buffer_length = 0;
 Warnings:
@@ -105,42 +82,12 @@ ERROR 42000: Incorrect argument type to variable 'net_buffer_length'
 SELECT @@global.net_buffer_length;
 @@global.net_buffer_length
 1048576
-SET @@session.net_buffer_length = 0;
-Warnings:
-Warning	1292	Truncated incorrect net_buffer_length value: '0'
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1024
-SET @@session.net_buffer_length = -2;
-Warnings:
-Warning	1292	Truncated incorrect net_buffer_length value: '0'
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1024
-SET @@session.net_buffer_length = 1048577;
-Warnings:
-Warning	1292	Truncated incorrect net_buffer_length value: '1048577'
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1048576
-SET @@session.net_buffer_length = 1048576002;
-Warnings:
-Warning	1292	Truncated incorrect net_buffer_length value: '1048576002'
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-1048576
-SET @@session.net_buffer_length = 65530.34.;
-ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.' at line 1
-SET @@session.net_buffer_length = 65550;
-SELECT @@session.net_buffer_length;
-@@session.net_buffer_length
-65536
 'Bug # 34837: Errors are not coming on assigning invalid values to variable';
 SET @@session.net_buffer_length = test;
 ERROR 42000: Incorrect argument type to variable 'net_buffer_length'
 SELECT @@session.net_buffer_length;
 @@session.net_buffer_length
-65536
+16384
 '#------------------FN_DYNVARS_109_06-----------------------#'
 SELECT @@global.net_buffer_length = VARIABLE_VALUE 
 FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
@@ -172,18 +119,10 @@ SELECT @@net_buffer_length = @@global.net_buffer_length;
 @@net_buffer_length = @@global.net_buffer_length
 0
 '#---------------------FN_DYNVARS_109_10----------------------#'
-SET @@net_buffer_length = 100000;
-SELECT @@net_buffer_length = @@local.net_buffer_length;
-@@net_buffer_length = @@local.net_buffer_length
-1
-SELECT @@local.net_buffer_length = @@session.net_buffer_length;
-@@local.net_buffer_length = @@session.net_buffer_length
-1
 '#---------------------FN_DYNVARS_109_11----------------------#'
-SET net_buffer_length = 1024;
 SELECT @@net_buffer_length;
 @@net_buffer_length
-1024
+16384
 SELECT local.net_buffer_length;
 ERROR 42S02: Unknown table 'local' in field list
 SELECT session.net_buffer_length;
@@ -191,4 +130,3 @@ ERROR 42S02: Unknown table 'session' in field list
 SELECT net_buffer_length = @@session.net_buffer_length;
 ERROR 42S22: Unknown column 'net_buffer_length' in 'field list'
 SET @@global.net_buffer_length = @start_global_value;
-SET @@session.net_buffer_length = @start_session_value;

mysql-test/r/packet.result

 set global max_allowed_packet=100;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '100'
-set max_allowed_packet=100;
-Warnings:
-Warning	1292	Truncated incorrect max_allowed_packet value: '100'
 set global net_buffer_length=100;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '100'
-set net_buffer_length=100;
-Warnings:
-Warning	1292	Truncated incorrect net_buffer_length value: '100'
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
 len
 1024
 select repeat('a',2000);
 repeat('a',2000)
-NULL
-Warnings:
-Warning	1301	Result of repeat() was larger than max_allowed_packet (1024) - truncated
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 select @@net_buffer_length, @@max_allowed_packet;
 @@net_buffer_length	@@max_allowed_packet
 1024	1024
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
 ERROR 08S01: Got a packet bigger than 'max_allowed_packet' bytes
 set global max_allowed_packet=default;
-set max_allowed_packet=default;
 set global net_buffer_length=default;
-set net_buffer_length=default;
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
 len
 100

mysql-test/r/union.result

@@ -1343,10 +1343,10 @@ t3	CREATE TABLE `t3` (
   `left(a,100000000)` longtext
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop tables t1,t2,t3;
-SELECT @tmp_max:= @@max_allowed_packet;
-@tmp_max:= @@max_allowed_packet
+SELECT @tmp_max:= @@global.max_allowed_packet;
+@tmp_max:= @@global.max_allowed_packet
 1048576
-SET max_allowed_packet=25000000;
+SET @@global.max_allowed_packet=25000000;
 CREATE TABLE t1 (a mediumtext);
 CREATE TABLE t2 (b varchar(20));
 INSERT INTO t1 VALUES ('a');
@@ -1384,7 +1384,7 @@ t3	CREATE TABLE `t3` (
   `a` varbinary(510) DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 DROP TABLES t1,t2,t3;
-SET max_allowed_packet:= @tmp_max;
+SET @@global.max_allowed_packet:= @tmp_max;
 create table t1 ( id int not null auto_increment, primary key (id), col1 int);
 insert into t1 (col1) values (2),(3),(4),(5),(6);
 select 99 union all select id from t1 order by 1;

mysql-test/r/variables.result

@@ -228,7 +228,6 @@ VARIABLE_NAME	VARIABLE_VALUE
 MYISAM_MAX_SORT_FILE_SIZE	FILE_SIZE
 set global net_retry_count=10, session net_retry_count=10;
 set global net_buffer_length=1024, net_write_timeout=200, net_read_timeout=300;
-set session net_buffer_length=2048, net_write_timeout=500, net_read_timeout=600;
 show global variables like 'net_%';
 Variable_name	Value
 net_buffer_length	1024
@@ -243,57 +242,45 @@ NET_RETRY_COUNT	10
 NET_WRITE_TIMEOUT	200
 show session variables like 'net_%';
 Variable_name	Value
-net_buffer_length	2048
-net_read_timeout	600
+net_buffer_length	16384
+net_read_timeout	30
 net_retry_count	10
-net_write_timeout	500
+net_write_timeout	60
 select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
 VARIABLE_NAME	VARIABLE_VALUE
-NET_BUFFER_LENGTH	2048
-NET_READ_TIMEOUT	600
+NET_BUFFER_LENGTH	16384
+NET_READ_TIMEOUT	30
 NET_RETRY_COUNT	10
-NET_WRITE_TIMEOUT	500
-set session net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
+NET_WRITE_TIMEOUT	60
+set global net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
 show global variables like 'net_%';
 Variable_name	Value
-net_buffer_length	1024
+net_buffer_length	7168
 net_read_timeout	900
 net_retry_count	10
 net_write_timeout	1000
 select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
 VARIABLE_NAME	VARIABLE_VALUE
-NET_BUFFER_LENGTH	1024
+NET_BUFFER_LENGTH	7168
 NET_READ_TIMEOUT	900
 NET_RETRY_COUNT	10
 NET_WRITE_TIMEOUT	1000
-show session variables like 'net_%';
-Variable_name	Value
-net_buffer_length	7168
-net_read_timeout	600
-net_retry_count	10
-net_write_timeout	500
-select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
-VARIABLE_NAME	VARIABLE_VALUE
-NET_BUFFER_LENGTH	7168
-NET_READ_TIMEOUT	600
-NET_RETRY_COUNT	10
-NET_WRITE_TIMEOUT	500
-set net_buffer_length=1;
+set global net_buffer_length=1;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '1'
-show variables like 'net_buffer_length';
+show global variables like 'net_buffer_length';
 Variable_name	Value
 net_buffer_length	1024
-select * from information_schema.session_variables where variable_name like 'net_buffer_length';
+select * from information_schema.global_variables where variable_name like 'net_buffer_length';
 VARIABLE_NAME	VARIABLE_VALUE
 NET_BUFFER_LENGTH	1024
-set net_buffer_length=2000000000;
+set global net_buffer_length=2000000000;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '2000000000'
-show variables like 'net_buffer_length';
+show global variables like 'net_buffer_length';
 Variable_name	Value
 net_buffer_length	1048576
-select * from information_schema.session_variables where variable_name like 'net_buffer_length';
+select * from information_schema.global_variables where variable_name like 'net_buffer_length';
 VARIABLE_NAME	VARIABLE_VALUE
 NET_BUFFER_LENGTH	1048576
 set character set cp1251_koi8;
@@ -461,7 +448,7 @@ select @@long_query_time;
 @@long_query_time
 100.000001
 set low_priority_updates=1;
-set max_allowed_packet=100;
+set global max_allowed_packet=100;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '100'
 set global max_binlog_cache_size=100;
@@ -485,7 +472,7 @@ select @@max_user_connections;
 100
 set global max_write_lock_count=100;
 set myisam_sort_buffer_size=100;
-set net_buffer_length=100;
+set global net_buffer_length=100;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '100'
 set net_read_timeout=100;

mysql-test/t/ctype_utf8.test

@@ -1439,3 +1439,20 @@ select hex(_utf8 X'616263FF');
 select hex(_utf8 B'001111111111');
 --error ER_INVALID_CHARACTER_STRING
 select (_utf8 X'616263FF');
+
+#
+# Bug #36772: When using UTF8, CONVERT with GROUP BY returns truncated results
+#
+CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL);
+INSERT INTO t1 VALUES (70000, 1092), (70001, 1085), (70002, 1065);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1;
+ALTER TABLE t1 ADD UNIQUE (b);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+DROP INDEX b ON t1;
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) FROM t1 GROUP BY b;
+ALTER TABLE t1 ADD INDEX (b);
+SELECT CONVERT(a, CHAR), CONVERT(b, CHAR) from t1 GROUP BY b;
+DROP TABLE t1;
+
+--echo End of 5.0 tests

mysql-test/t/func_compress.test

@@ -43,8 +43,11 @@ drop table t1;
 # note that when LOW_MEMORY is set the "test" below is meaningless
 #
 
-set @@max_allowed_packet=1048576*100;
+set @@global.max_allowed_packet=1048576*100;
 --replace_result "''" XXX "'1'" XXX
+
+# reconnect to make the new max packet size take effect
+--connect (newconn, localhost, root,,)
 eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
 
 #

mysql-test/t/innodb_bug34300.test

@@ -8,7 +8,9 @@
 -- disable_query_log
 -- disable_result_log
 
-SET @@max_allowed_packet=16777216;
+# set packet size and reconnect 
+SET @@global.max_allowed_packet=16777216;
+--connect (newconn, localhost, root,,)
 
 DROP TABLE IF EXISTS bug34300;
 CREATE TABLE bug34300 (

mysql-test/t/max_allowed_packet_basic.test

@@ -36,8 +36,13 @@
 
 SET @start_global_value = @@global.max_allowed_packet;
 SELECT @start_global_value;
-SET @start_session_value = @@session.max_allowed_packet;
-SELECT @start_session_value;
+
+# give a known value to @@session.max_allowed_packet by assigning to
+# @@global and setting up a new connection (for deterministic result
+# file diffing)
+SET @@global.max_allowed_packet = DEFAULT;
+connect (conn1, localhost, root,,);
+
 
 
 --echo '#--------------------FN_DYNVARS_070_01-------------------------#'
@@ -49,7 +54,9 @@ SET @@global.max_allowed_packet = 1000;
 SET @@global.max_allowed_packet = DEFAULT;
 SELECT @@global.max_allowed_packet;
 
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 20000;
+--Error ER_NO_DEFAULT
 SET @@session.max_allowed_packet = DEFAULT;
 SELECT @@session.max_allowed_packet;
 
@@ -62,9 +69,6 @@ SELECT @@session.max_allowed_packet;
 SET @@global.max_allowed_packet = DEFAULT;
 SELECT @@global.max_allowed_packet = 1048576;
 
-SET @@session.max_allowed_packet = DEFAULT;
-SELECT @@session.max_allowed_packet = 1048576;
-
 
 --echo '#--------------------FN_DYNVARS_070_03-------------------------#'
 ############################################################################
@@ -86,14 +90,19 @@ SELECT @@global.max_allowed_packet;
 # Change the value of max_allowed_packet to a valid value for SESSION Scope #
 #############################################################################
  
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1024;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1025;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 65535;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1073741824;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1073741823;
 SELECT @@session.max_allowed_packet;
 
@@ -118,14 +127,18 @@ SELECT @@global.max_allowed_packet;
 SET @@global.max_allowed_packet = test;
 SELECT @@global.max_allowed_packet;
 
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 0;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1023;
 SELECT @@session.max_allowed_packet;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = -2;
 SELECT @@session.max_allowed_packet;
 --Error ER_PARSE_ERROR
 SET @@session.max_allowed_packet = 65530.34.;
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 10737418241;
 SELECT @@session.max_allowed_packet;
 --echo 'Bug # 34837: Errors are not coming on assigning invalid values to variable';
@@ -180,6 +193,7 @@ SELECT @@max_allowed_packet = @@global.max_allowed_packet;
 #    Check if accessing variable with SESSION,LOCAL and without SCOPE points to same session variable  #
 ########################################################################################################
 
+--Error ER_VARIABLE_IS_READONLY
 SET @@max_allowed_packet = 100000;
 SELECT @@max_allowed_packet = @@local.max_allowed_packet;
 SELECT @@local.max_allowed_packet = @@session.max_allowed_packet;
@@ -190,6 +204,7 @@ SELECT @@local.max_allowed_packet = @@session.max_allowed_packet;
 #   Check if max_allowed_packet can be accessed with and without @@ sign    #
 #############################################################################
 
+--Error ER_VARIABLE_IS_READONLY
 SET max_allowed_packet = 1024;
 SELECT @@max_allowed_packet;
 --Error ER_UNKNOWN_TABLE
@@ -204,9 +219,9 @@ SELECT max_allowed_packet = @@session.max_allowed_packet;
 #     Restore initial value        #
 ####################################
 
+connection default;
 SET @@global.max_allowed_packet = @start_global_value;
 SELECT @@global.max_allowed_packet;
-SET @@session.max_allowed_packet = @start_session_value;
 SELECT @@session.max_allowed_packet;
 
 

mysql-test/t/max_allowed_packet_func.test

@@ -43,26 +43,19 @@ name BLOB
 
 --echo '#--------------------FN_DYNVARS_070_01-------------------------#'
 ###############################################################################
-#    Setting initial value of max_allowed_packet to 1024 at session level and
-#    verifying its behavior after inserting data greater than 1024 bytes     
+#    Setting initial value of max_allowed_packet to 1024 at session level 
+#    should result in an error (session variable is readonly)
 ###############################################################################
 
 --echo ## Setting value of max_allowed packet and net_buffer_length to 1024 ## 
+--error ER_VARIABLE_IS_READONLY
 SET @@session.max_allowed_packet = 1024;
-SET @@session.net_buffer_length = 1024;
 SELECT @@session.max_allowed_packet;
-SELECT @@session.net_buffer_length;
-
---echo ## Inserting and fetching data of length greater than 1024 ##
-INSERT into t1(name) values("aaassssssssddddddddffffffgggggggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
-
-SELECT length("aaaaaasssssssssssdddddddfffffgggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk") as len;
 
---echo ## Verifying record in table t1 ##
-SELECT * from t1;
+--error ER_VARIABLE_IS_READONLY
+SET @@session.net_buffer_length = 1024;
+SELECT @@session.net_buffer_length;
 
---echo 'Bug#35381: Error is not coming on inserting and fetching data of length'
---echo 'greater than max_allowed_packet size at session level';
 
 --echo '#--------------------FN_DYNVARS_070_02-------------------------#'
 ###############################################################################

mysql-test/t/net_buffer_length_basic.test

@@ -38,9 +38,13 @@
 SET @start_global_value = @@global.net_buffer_length;
 # Due to differences in results of linux and windows
 #SELECT @start_global_value;
-SET @start_session_value = @@session.net_buffer_length;
-#SELECT @start_session_value;
 
+# give a known value to @@session.net_buffer_length by assigning to
+# @@global and setting up a new connection (for deterministic result
+# file diffing)
+SET @@global.net_buffer_length = DEFAULT;
+connect(con1,localhost,root,,);
+connection con1;
 
 --echo '#--------------------FN_DYNVARS_109_01-------------------------#'
 #################################################################
@@ -51,7 +55,9 @@ SET @@global.net_buffer_length = 10000;
 SET @@global.net_buffer_length = DEFAULT;
 SELECT @@global.net_buffer_length;
 
+--Error ER_VARIABLE_IS_READONLY
 SET @@session.net_buffer_length = 20000;
+--Error ER_NO_DEFAULT
 SET @@session.net_buffer_length = DEFAULT;
 SELECT @@session.net_buffer_length;
 
@@ -64,9 +70,6 @@ SELECT @@session.net_buffer_length;
 SET @@global.net_buffer_length = DEFAULT;
 SELECT @@global.net_buffer_length = 16384;
 
-SET @@session.net_buffer_length = DEFAULT;
-SELECT @@session.net_buffer_length = 16384;
-
 
 --echo '#--------------------FN_DYNVARS_109_03-------------------------#'
 ###########################################################################
@@ -91,17 +94,7 @@ SELECT @@global.net_buffer_length;
 # Change the value of net_buffer_length to a valid value for SESSION Scope #
 ############################################################################
  
-SET @@session.net_buffer_length = 1024;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 1025;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 1048576;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 1048575;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 65535;
-SELECT @@session.net_buffer_length;
---echo 'Bug# 34877: Invalid Values are coming in variable on assigning valid values';
+# Bug#22891: SESSION net_buffer_length is now read-only; assignments skipped
 
 
 --echo '#------------------FN_DYNVARS_109_05-----------------------#'
@@ -126,18 +119,8 @@ SELECT @@global.net_buffer_length;
 SET @@global.net_buffer_length = test;
 SELECT @@global.net_buffer_length;
 
-SET @@session.net_buffer_length = 0;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = -2;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 1048577;
-SELECT @@session.net_buffer_length;
-SET @@session.net_buffer_length = 1048576002;
-SELECT @@session.net_buffer_length;
---Error ER_PARSE_ERROR
-SET @@session.net_buffer_length = 65530.34.;
-SET @@session.net_buffer_length = 65550;
-SELECT @@session.net_buffer_length;
+# Bug#22891: SESSION net_buffer_length is now read-only; assignments skipped
+
 --echo 'Bug # 34837: Errors are not coming on assigning invalid values to variable';
 
 --Error ER_WRONG_TYPE_FOR_VAR
@@ -190,9 +173,7 @@ SELECT @@net_buffer_length = @@global.net_buffer_length;
 #    Check if accessing variable with SESSION,LOCAL and without SCOPE points to same session variable  #
 ########################################################################################################
 
-SET @@net_buffer_length = 100000;
-SELECT @@net_buffer_length = @@local.net_buffer_length;
-SELECT @@local.net_buffer_length = @@session.net_buffer_length;
+# Bug#22891: SESSION net_buffer_length is now read-only; assignments skipped
 
 
 --echo '#---------------------FN_DYNVARS_109_11----------------------#'
@@ -200,7 +181,7 @@ SELECT @@local.net_buffer_length = @@session.net_buffer_length;
 #   Check if net_buffer_length can be accessed with and without @@ sign    #
 ############################################################################
 
-SET net_buffer_length = 1024;
+# Bug#22891: SESSION net_buffer_length is now read-only; assignments skipped
 SELECT @@net_buffer_length;
 --Error ER_UNKNOWN_TABLE
 SELECT local.net_buffer_length;
@@ -214,11 +195,11 @@ SELECT net_buffer_length = @@session.net_buffer_length;
 #     Restore initial value        #
 ####################################
 
+connection default;
+
 SET @@global.net_buffer_length = @start_global_value;
 # Due to differences in results of linux and windows
 #SELECT @@global.net_buffer_length;
-SET @@session.net_buffer_length = @start_session_value;
-#SELECT @@session.net_buffer_length;
 
 
 ######################################################

mysql-test/t/packet.test

@@ -8,30 +8,30 @@
 # Check protocol handling
 #
 
-connect (con1,localhost,root,,);
-
-connection con1;
+# setting values below minimum threshold of 1024 will cause truncating
 set global max_allowed_packet=100;
-set max_allowed_packet=100;
 set global net_buffer_length=100;
-set net_buffer_length=100;
-# Have to be > 1024 as min value of net_buffer_length is 1024
+
+# is not yet in effect
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
-# Should return NULL as 2000 is bigger than max_allowed_packet
 select repeat('a',2000);
 
 #
-# Connection 2 should get error for too big packets
+# Connection 1 should get error for too big packets
 #
-connect (con2,localhost,root,,);
-connection con2;
+connect (con1,localhost,root,,);
+connection con1;
 select @@net_buffer_length, @@max_allowed_packet;
 --error 1153
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
+
+#
+# Reset to default values and reconnect
+#
 set global max_allowed_packet=default;
-set max_allowed_packet=default;
 set global net_buffer_length=default;
-set net_buffer_length=default;
+connect (con2,localhost,root,,);
+connection con2;
 SELECT length("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") as len;
 select length(repeat('a',2000));
 

mysql-test/t/union.test

@@ -861,8 +861,10 @@ drop tables t1,t2,t3;
 # exceeds mediumtext maximum length
 #
 
-SELECT @tmp_max:= @@max_allowed_packet;
-SET max_allowed_packet=25000000;
+SELECT @tmp_max:= @@global.max_allowed_packet;
+SET @@global.max_allowed_packet=25000000;
+# switching connection to allow the new max_allowed_packet take effect
+--connect (newconn, localhost, root,,)
 CREATE TABLE t1 (a mediumtext);
 CREATE TABLE t2 (b varchar(20));
 INSERT INTO t1 VALUES ('a');
@@ -884,7 +886,9 @@ INSERT INTO t1 VALUES ('a');
 CREATE TABLE t3 SELECT REPEAT(a,2) AS a FROM t1 UNION SELECT b FROM t2;
 SHOW CREATE TABLE t3;
 DROP TABLES t1,t2,t3;
-SET max_allowed_packet:= @tmp_max;
+--connection default
+SET @@global.max_allowed_packet:= @tmp_max;
+--disconnect newconn
 
 #
 # Bug #10032 Bug in parsing UNION with ORDER BY when one node does not use FROM

mysql-test/t/variables.test

@@ -146,25 +146,23 @@ show global variables like 'myisam_max_sort_file_size';
 --replace_result 9223372036853727232 FILE_SIZE 2146435072 FILE_SIZE
 select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
 
+# bug#22891: modified to take read-only SESSION net_buffer_length into account
 set global net_retry_count=10, session net_retry_count=10;
 set global net_buffer_length=1024, net_write_timeout=200, net_read_timeout=300;
-set session net_buffer_length=2048, net_write_timeout=500, net_read_timeout=600;
 show global variables like 'net_%';
 select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
 show session variables like 'net_%';
 select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
-set session net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
+set global net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
 show global variables like 'net_%';
 select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
-show session variables like 'net_%';
-select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
-set net_buffer_length=1;
-show variables like 'net_buffer_length';
-select * from information_schema.session_variables where variable_name like 'net_buffer_length';
+set global net_buffer_length=1;
+show global variables like 'net_buffer_length';
+select * from information_schema.global_variables where variable_name like 'net_buffer_length';
 #warning 1292
-set net_buffer_length=2000000000;
-show variables like 'net_buffer_length';
-select * from information_schema.session_variables where variable_name like 'net_buffer_length';
+set global net_buffer_length=2000000000;
+show global variables like 'net_buffer_length';
+select * from information_schema.global_variables where variable_name like 'net_buffer_length';
 
 set character set cp1251_koi8;
 show variables like "character_set_client";
@@ -274,7 +272,7 @@ select @@long_query_time;
 set long_query_time=100.000001;
 select @@long_query_time;
 set low_priority_updates=1;
-set max_allowed_packet=100;
+set global max_allowed_packet=100;
 set global max_binlog_cache_size=100;
 set global max_binlog_size=100;
 set global max_connect_errors=100;
@@ -288,7 +286,7 @@ set global max_user_connections=100;
 select @@max_user_connections;
 set global max_write_lock_count=100;
 set myisam_sort_buffer_size=100;
-set net_buffer_length=100;
+set global net_buffer_length=100;
 set net_read_timeout=100;
 set net_write_timeout=100;
 set global query_cache_limit=100;

mysys/mf_tempdir.c

@@ -85,6 +85,8 @@ char *my_tmpdir(MY_TMPDIR *tmpdir)
 void free_tmpdir(MY_TMPDIR *tmpdir)
 {
   uint i;
+  if (!tmpdir->full_list.elements)
+    return;
   for (i=0; i<=tmpdir->max; i++)
     my_free(tmpdir->list[i], MYF(0));
   delete_dynamic(&tmpdir->full_list);

mysys/my_getopt.c

@@ -397,9 +397,10 @@ invalid value '%s'",
 				       my_progname, optp->name, optend);
 	      continue;
 	    }
-	    get_one_option(optp->id, optp,
-			   *((my_bool*) value) ?
-			   (char*) "1" : disabled_my_option);
+	    if (get_one_option(optp->id, optp,
+                               *((my_bool*) value) ?
+                               (char*) "1" : disabled_my_option))
+              return EXIT_ARGUMENT_INVALID;
 	    continue;
 	  }
 	  argument= optend;
@@ -457,7 +458,8 @@ invalid value '%s'",
 		  optp->arg_type == NO_ARG)
 	      {
 		*((my_bool*) optp->value)= (my_bool) 1;
-		get_one_option(optp->id, optp, argument);
+		if (get_one_option(optp->id, optp, argument))
+                  return EXIT_UNSPECIFIED_ERROR;
 		continue;
 	      }
 	      else if (optp->arg_type == REQUIRED_ARG ||
@@ -476,7 +478,8 @@ invalid value '%s'",
                   {
                     if (optp->var_type == GET_BOOL)
                       *((my_bool*) optp->value)= (my_bool) 1;
-                    get_one_option(optp->id, optp, argument);
+                    if (get_one_option(optp->id, optp, argument))
+                      return EXIT_UNSPECIFIED_ERROR;
                     continue;
                   }
 		  /* Check if there are more arguments after this one */
@@ -501,7 +504,8 @@ invalid value '%s'",
                                          my_progname, argument, optp->name);
 		return error;
 	      }
-	      get_one_option(optp->id, optp, argument);
+	      if (get_one_option(optp->id, optp, argument))
+                return EXIT_UNSPECIFIED_ERROR;
 	      break;
 	    }
 	  }
@@ -524,7 +528,8 @@ invalid value '%s'",
                                  my_progname, argument, optp->name);
 	return error;
       }
-      get_one_option(optp->id, optp, argument);
+      if (get_one_option(optp->id, optp, argument))
+        return EXIT_UNSPECIFIED_ERROR;
 
       (*argc)--; /* option handled (short or long), decrease argument count */
     }

sql/handler.cc

@@ -3627,7 +3627,7 @@ int ha_init_key_cache(const char *name, KEY_CACHE *key_cache)
   if (!key_cache->key_cache_inited)
   {
     pthread_mutex_lock(&LOCK_global_system_variables);
-    ulong tmp_buff_size= (ulong) key_cache->param_buff_size;
+    size_t tmp_buff_size= (size_t) key_cache->param_buff_size;
     uint tmp_block_size= (uint) key_cache->param_block_size;
     uint division_limit= key_cache->param_division_limit;
     uint age_threshold=  key_cache->param_age_threshold;
@@ -3651,7 +3651,7 @@ int ha_resize_key_cache(KEY_CACHE *key_cache)
   if (key_cache->key_cache_inited)
   {
     pthread_mutex_lock(&LOCK_global_system_variables);
-    long tmp_buff_size= (long) key_cache->param_buff_size;
+    size_t tmp_buff_size= (size_t) key_cache->param_buff_size;
     long tmp_block_size= (long) key_cache->param_block_size;
     uint division_limit= key_cache->param_division_limit;
     uint age_threshold=  key_cache->param_age_threshold;

sql/item_func.cc

@@ -3810,11 +3810,14 @@ static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
 
 bool Item_func_set_user_var::set_entry(THD *thd, bool create_if_not_exists)
 {
-  if (thd == entry_thd && entry)
+  if (entry && thd->thread_id == entry_thread_id)
     goto end; // update entry->update_query_id for PS
-  entry_thd= thd;
   if (!(entry= get_variable(&thd->user_vars, name, create_if_not_exists)))
+  {
+    entry_thread_id= 0;
     return TRUE;
+  }
+  entry_thread_id= thd->thread_id;
   /* 
      Remember the last query which updated it, this way a query can later know
      if this variable is a constant item in the query (it is if update_query_id

sql/item_func.h

@@ -1295,16 +1295,16 @@ class Item_func_set_user_var :public Item_func
   enum Item_result cached_result_type;
   user_var_entry *entry;
   /*
-    The entry_thd variable is used:
+    The entry_thread_id variable is used:
     1) to skip unnecessary updates of the entry field (see above);
     2) to reset the entry field that was initialized in the other thread
        (for example, an item tree of a trigger that updates user variables
-       may be shared between several connections, and the entry_thd field
+       may be shared between several connections, and the entry_thread_id field
        prevents updates of one connection user variables from a concurrent
        connection calling the same trigger that initially updated some
        user variable it the first connection context).
   */
-  THD *entry_thd;
+  my_thread_id entry_thread_id;
   char buffer[MAX_FIELD_WIDTH];
   String value;
   my_decimal decimal_buff;
@@ -1321,7 +1321,7 @@ class Item_func_set_user_var :public Item_func
   LEX_STRING name; // keep it public
   Item_func_set_user_var(LEX_STRING a,Item *b)
     :Item_func(b), cached_result_type(INT_RESULT),
-     entry(NULL), entry_thd(NULL), name(a)
+     entry(NULL), entry_thread_id(0), name(a)
   {}
   enum Functype functype() const { return SUSERVAR_FUNC; }
   double val_real();

sql/item_timefunc.cc

@@ -2504,6 +2504,8 @@ void Item_char_typecast::fix_length_and_dec()
        and thus avoid unnecessary character set conversion.
      - If the argument is not a number, then from_cs is set to
        the argument's charset.
+
+       Note (TODO): we could use repertoire technique here.
   */
   from_cs= (args[0]->result_type() == INT_RESULT || 
             args[0]->result_type() == DECIMAL_RESULT ||
@@ -2511,12 +2513,13 @@ void Item_char_typecast::fix_length_and_dec()
            (cast_cs->mbminlen == 1 ? cast_cs : &my_charset_latin1) :
            args[0]->collation.collation;
   charset_conversion= (cast_cs->mbmaxlen > 1) ||
-                      !my_charset_same(from_cs, cast_cs) &&
-                      from_cs != &my_charset_bin &&
-                      cast_cs != &my_charset_bin;
+                      (!my_charset_same(from_cs, cast_cs) &&
+                       from_cs != &my_charset_bin &&
+                       cast_cs != &my_charset_bin);
   collation.set(cast_cs, DERIVATION_IMPLICIT);
-  char_length= (cast_length >= 0) ? cast_length : 
-	       args[0]->max_length/from_cs->mbmaxlen;
+  char_length= (cast_length >= 0) ?
+                 cast_length :
+                 args[0]->max_length / args[0]->collation.collation->mbmaxlen;
   max_length= char_length * cast_cs->mbmaxlen;
 }
 

sql/mysqld.cc

@@ -733,7 +733,7 @@ uint connection_count= 0;
 /* Function declarations */
 
 pthread_handler_t signal_hand(void *arg);
-static void mysql_init_variables(void);
+static int mysql_init_variables(void);
 static void get_options(int *argc,char **argv);
 extern "C" my_bool mysqld_get_one_option(int, const struct my_option *, char *);
 static void set_server_version(void);
@@ -3141,12 +3141,12 @@ static int init_common_variables(const char *conf_file_name, int argc,
   if (!rpl_filter || !binlog_filter)
   {
     sql_perror("Could not allocate replication and binlog filters");
-    exit(1);
+    return 1;
   }
 
-  if (init_thread_environment())
+  if (init_thread_environment() ||
+      mysql_init_variables())
     return 1;
-  mysql_init_variables();
 
 #ifdef HAVE_TZNAME
   {
@@ -3745,7 +3745,10 @@ version 5.0 and above. It is replaced by the binary log.");
       {
         /* as opt_bin_log==0, no need to free opt_bin_logname */
         if (!(opt_bin_logname= my_strdup(opt_update_logname, MYF(MY_WME))))
-          exit(EXIT_OUT_OF_MEMORY);
+        {
+          sql_print_error("Out of memory");
+          return EXIT_OUT_OF_MEMORY;
+        }
         sql_print_error("The update log is no longer supported by MySQL in \
 version 5.0 and above. It is replaced by the binary log. Now starting MySQL \
 with --log-bin='%s' instead.",opt_bin_logname);
@@ -7348,6 +7351,7 @@ SHOW_VAR status_vars[]= {
   {NullS, NullS, SHOW_LONG}
 };
 
+#ifndef EMBEDDED_LIBRARY
 static void print_version(void)
 {
   set_server_version();
@@ -7359,7 +7363,6 @@ static void print_version(void)
 	 server_version,SYSTEM_TYPE,MACHINE_TYPE, MYSQL_COMPILATION_COMMENT);
 }
 
-#ifndef EMBEDDED_LIBRARY
 static void usage(void)
 {
   if (!(default_charset_info= get_charset_by_csname(default_character_set_name,
@@ -7424,7 +7427,7 @@ To see what values a running MySQL server is using, type\n\
     as these are initialized by my_getopt.
 */
 
-static void mysql_init_variables(void)
+static int mysql_init_variables(void)
 {
   /* Things reset to zero */
   opt_skip_slave_start= opt_reckless_slave = 0;
@@ -7505,7 +7508,10 @@ static void mysql_init_variables(void)
   key_caches.empty();
   if (!(dflt_key_cache= get_or_create_key_cache(default_key_cache_base.str,
                                                 default_key_cache_base.length)))
-    exit(1);
+  {
+    sql_print_error("Cannot allocate the keycache");
+    return 1;
+  }
   /* set key_cache_hash.default_value = dflt_key_cache */
   multi_keycache_init();
 
@@ -7648,6 +7654,7 @@ static void mysql_init_variables(void)
     tmpenv = DEFAULT_MYSQL_HOME;
   (void) strmake(mysql_home, tmpenv, sizeof(mysql_home)-1);
 #endif
+  return 0;
 }
 
 
@@ -7708,9 +7715,11 @@ mysqld_get_one_option(int optid,
 #endif
     break;
 #include <sslopt-case.h>
+#ifndef EMBEDDED_LIBRARY
   case 'V':
     print_version();
     exit(0);
+#endif /*EMBEDDED_LIBRARY*/
   case 'W':
     if (!argument)
       global_system_variables.log_warnings++;
@@ -7939,14 +7948,14 @@ mysqld_get_one_option(int optid,
 	if (gethostname(myhostname,sizeof(myhostname)) < 0)
 	{
 	  sql_perror("Can't start server: cannot get my own hostname!");
-	  exit(1);
+          return 1;
 	}
 	ent=gethostbyname(myhostname);
       }
       if (!ent)
       {
 	sql_perror("Can't start server: cannot resolve hostname!");
-	exit(1);
+        return 1;
       }
       my_bind_addr = (ulong) ((in_addr*)ent->h_addr_list[0])->s_addr;
     }
@@ -8143,8 +8152,8 @@ mysqld_get_one_option(int optid,
   case OPT_FT_BOOLEAN_SYNTAX:
     if (ft_boolean_check_syntax_string((uchar*) argument))
     {
-      fprintf(stderr, "Invalid ft-boolean-syntax string: %s\n", argument);
-      exit(1);
+      sql_print_error("Invalid ft-boolean-syntax string: %s\n", argument);
+      return 1;
     }
     strmake(ft_boolean_syntax, argument, sizeof(ft_boolean_syntax)-1);
     break;

sql/set_var.cc

@@ -296,7 +296,7 @@ static sys_var_thd_bool	sys_sql_low_priority_updates(&vars, "sql_low_priority_up
 						     &SV::low_priority_updates,
 						     fix_low_priority_updates);
 #endif
-static sys_var_thd_ulong	sys_max_allowed_packet(&vars, "max_allowed_packet",
+static sys_var_thd_ulong_session_readonly sys_max_allowed_packet(&vars, "max_allowed_packet",
 					       &SV::max_allowed_packet);
 static sys_var_long_ptr	sys_max_binlog_cache_size(&vars, "max_binlog_cache_size",
 						  &max_binlog_cache_size);
@@ -369,7 +369,7 @@ static sys_var_thd_enum         sys_myisam_stats_method(&vars, "myisam_stats_met
                                                 &myisam_stats_method_typelib,
                                                 NULL);
 
-static sys_var_thd_ulong	sys_net_buffer_length(&vars, "net_buffer_length",
+static sys_var_thd_ulong_session_readonly sys_net_buffer_length(&vars, "net_buffer_length",
 					      &SV::net_buffer_length);
 static sys_var_thd_ulong	sys_net_read_timeout(&vars, "net_read_timeout",
 					     &SV::net_read_timeout,
@@ -2734,6 +2734,18 @@ uchar *sys_var_max_user_conn::value_ptr(THD *thd, enum_var_type type,
 }
 
 
+bool sys_var_thd_ulong_session_readonly::check(THD *thd, set_var *var)
+{
+  if (var->type != OPT_GLOBAL)
+  {
+    my_error(ER_VARIABLE_IS_READONLY, MYF(0), "SESSION", name, "GLOBAL");
+    return TRUE;
+  }
+
+  return sys_var_thd_ulong::check(thd, var);
+}
+
+
 bool sys_var_thd_lc_time_names::check(THD *thd, set_var *var)
 {
   MY_LOCALE *locale_match;

sql/set_var.h

@@ -1024,6 +1024,29 @@ class sys_var_max_user_conn : public sys_var_thd
 };
 
 
+/**
+ * @brief This is a specialization of sys_var_thd_ulong that implements a 
+   read-only session variable. The class overrides check() and check_default() 
+   to achieve the read-only property for the session part of the variable.
+ */
+class sys_var_thd_ulong_session_readonly : public sys_var_thd_ulong
+{
+public:
+  sys_var_thd_ulong_session_readonly(sys_var_chain *chain_arg, 
+                                     const char *name_arg, ulong SV::*offset_arg, 
+				     sys_check_func c_func= NULL,
+                                     sys_after_update_func au_func= NULL, 
+                                     Binlog_status_enum bl_status_arg= NOT_IN_BINLOG):
+    sys_var_thd_ulong(chain_arg, name_arg, offset_arg, c_func, au_func, bl_status_arg)
+  { }
+  bool check(THD *thd, set_var *var);
+  bool check_default(enum_var_type type)
+  {
+    return type != OPT_GLOBAL || !option_limits;
+  }
+};
+
+
 class sys_var_microseconds :public sys_var_thd
 {
   ulonglong SV::*offset;

sql/share/errmsg.txt

@@ -6151,3 +6151,6 @@ WARN_PLUGIN_DELETE_BUILTIN
 
 WARN_PLUGIN_BUSY
   eng "Plugin is busy and will be uninstalled on shutdown"
+
+ER_VARIABLE_IS_READONLY
+  eng "%s variable '%s' is read-only. Use SET %s to assign the value"