WL#3259 (RBR with more columns on slave than on master):

Extended replication to allow extra columns added last on slave
as compared with table on master.


mysql-test/extra/rpl_tests/rpl_row_tabledefs.test:
  Testing that replication can handle extra extra columns on slave.
mysql-test/r/rpl_row_tabledefs.result:
  Result file change
sql/Makefile.am:
  Adding new files.
sql/field.cc:
  Implementing missing Field_bit::set_default()
sql/field.h:
  Implementing missing Field_bit::set_default()
sql/log_event.cc:
  Extending unpack_row() and replace_record() to handle the case when there are more columns
  on the slave than on the master. Especially handle BIT columns correctly.
  Using newly introduced table_def class to perform comparison.
sql/log_event.h:
  Adding field to table_map_log_event. Changing prototype for do_prepare_row().
sql/mysql_priv.h:
  Adding include guards
mysql-test/t/rpl_row_tabledefs.test:
  New BitKeeper file ``mysql-test/t/rpl_row_tabledefs.test''
sql/rpl_utility.cc:
  New BitKeeper file ``sql/rpl_utility.cc''
sql/rpl_utility.h:
  New BitKeeper file ``sql/rpl_utility.h''

mysql-test/extra/rpl_tests/rpl_row_tabledefs.test

@@ -3,11 +3,16 @@
 
 # Consider making these part of the basic RBR tests.
 
--- source include/have_binlog_format_row.inc
--- source include/master-slave.inc
+connection slave;
+STOP SLAVE;
+SET GLOBAL SQL_MODE='STRICT_ALL_TABLES';
+START SLAVE;
 
 connection master;
-eval CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
+eval CREATE TABLE t1_int (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
+eval CREATE TABLE t1_bit (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
+eval CREATE TABLE t1_char (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
+eval CREATE TABLE t1_nodef (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
 eval CREATE TABLE t2 (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
 eval CREATE TABLE t3 (a INT PRIMARY KEY, b INT) ENGINE=$engine_type;
 eval CREATE TABLE t4 (a INT) ENGINE=$engine_type;
@@ -15,15 +20,21 @@ eval CREATE TABLE t5 (a INT, b INT, c INT) ENGINE=$engine_type;
 eval CREATE TABLE t6 (a INT, b INT, c INT) ENGINE=$engine_type;
 
 # Table used to detect that slave is running
-eval CREATE TABLE t9 (a INT PRIMARY KEY) ENGINE=$engine_type;
+eval CREATE TABLE t9 (a INT) ENGINE=$engine_type;
 
 sync_slave_with_master;
-# On the slave, we add one column last in table 't1',
-ALTER TABLE t1 ADD x INT DEFAULT 42;
-# ... add one column in the middle of table 't2', and
-ALTER TABLE t2 ADD x INT DEFAULT 42 AFTER a;
-# ... add one column first in table 't3'.
-ALTER TABLE t3 ADD x INT DEFAULT 42 FIRST;
+
+# On the slave, we add one INT column last in table 't1_int',
+ALTER TABLE t1_int ADD x INT DEFAULT 42;
+# ... and add one BIT column last in table 't1_bit',
+ALTER TABLE t1_bit ADD x BIT(3) DEFAULT b'011';
+# ... and add one CHAR column last in table 't1_char',
+ALTER TABLE t1_char ADD x CHAR(20) DEFAULT 'Just a test';
+# ... and add one non-nullable INT column last in table 't1_text'
+#     with no default,
+ALTER TABLE t1_nodef ADD x INT NOT NULL;
+# ... and remove the last column in t2
+ALTER TABLE t2 DROP b;
 # ... change the type of the single column in table 't4'
 ALTER TABLE t4 MODIFY a FLOAT;
 # ... change the type of the middle column of table 't5'
@@ -31,28 +42,37 @@ ALTER TABLE t5 MODIFY b FLOAT;
 # ... change the type of the last column of table 't6'
 ALTER TABLE t6 MODIFY c FLOAT;
 
-# Each of these should generate an error and stop the slave
+# Insert some values for tables on slave side. These should not be
+# modified when the row from the master is applied.
+INSERT INTO t1_int  VALUES (2,4,4711);
+INSERT INTO t1_char VALUES (2,4,'Foo is a bar');
+INSERT INTO t1_bit  VALUES (2,4,b'101');
+
+--echo **** On Master ****
 connection master;
-INSERT INTO t9 VALUES (1);
+INSERT INTO t1_int VALUES (1,2);
+INSERT INTO t1_int VALUES (2,5);
+INSERT INTO t1_bit VALUES (1,2);
+INSERT INTO t1_bit VALUES (2,5);
+INSERT INTO t1_char VALUES (1,2);
+INSERT INTO t1_char VALUES (2,5);
+SELECT * FROM t1_int;
+SELECT * FROM t1_bit;
+SELECT * FROM t1_char;
+--echo **** On Slave ****
 sync_slave_with_master;
-# Now slave is guaranteed to be running
-connection master;
-INSERT INTO t1 VALUES (1,2);
-connection slave;
-wait_for_slave_to_stop;
---replace_result $MASTER_MYPORT MASTER_PORT
---replace_column 1 # 8 # 9 # 23 # 33 #
---vertical_results
-SHOW SLAVE STATUS;
-SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
-START SLAVE;
+SELECT a,b,x FROM t1_int;
+SELECT a,b,HEX(x) FROM t1_bit;
+SELECT a,b,x FROM t1_char;
+
+# Each of these should generate an error and stop the slave
 
 connection master;
 INSERT INTO t9 VALUES (2);
 sync_slave_with_master;
 # Now slave is guaranteed to be running
 connection master;
-INSERT INTO t2 VALUES (2,4);
+INSERT INTO t1_nodef VALUES (1,2);
 connection slave;
 wait_for_slave_to_stop;
 --replace_result $MASTER_MYPORT MASTER_PORT
@@ -63,11 +83,11 @@ SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
 START SLAVE;
 
 connection master;
-INSERT INTO t9 VALUES (3);
+INSERT INTO t9 VALUES (2);
 sync_slave_with_master;
 # Now slave is guaranteed to be running
 connection master;
-INSERT INTO t3 VALUES (3,6);
+INSERT INTO t2 VALUES (2,4);
 connection slave;
 wait_for_slave_to_stop;
 --replace_result $MASTER_MYPORT MASTER_PORT
@@ -124,6 +144,7 @@ START SLAVE;
 
 connection master;
 --disable_warnings
-DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t9;
+DROP TABLE IF EXISTS t1_int,t1_bit,t1_char,t1_nodef;
+DROP TABLE IF EXISTS t2,t3,t4,t5,t6,t9;
 --enable_warnings
 sync_slave_with_master;

mysql-test/r/rpl_row_tabledefs.result

@@ -4,21 +4,64 @@ reset master;
 reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
-CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=myisam;
-CREATE TABLE t2 (a INT PRIMARY KEY, b INT) ENGINE=myisam;
-CREATE TABLE t3 (a INT PRIMARY KEY, b INT) ENGINE=myisam;
-CREATE TABLE t4 (a INT) ENGINE=myisam;
-CREATE TABLE t5 (a INT, b INT, c INT) ENGINE=myisam;
-CREATE TABLE t6 (a INT, b INT, c INT) ENGINE=myisam;
-CREATE TABLE t9 (a INT PRIMARY KEY) ENGINE=myisam;
-ALTER TABLE t1 ADD x INT DEFAULT 42;
-ALTER TABLE t2 ADD x INT DEFAULT 42 AFTER a;
-ALTER TABLE t3 ADD x INT DEFAULT 42 FIRST;
+STOP SLAVE;
+SET GLOBAL SQL_MODE='STRICT_ALL_TABLES';
+START SLAVE;
+CREATE TABLE t1_int (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t1_bit (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t1_char (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t1_nodef (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t2 (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t3 (a INT PRIMARY KEY, b INT) ENGINE='MyISAM';
+CREATE TABLE t4 (a INT) ENGINE='MyISAM';
+CREATE TABLE t5 (a INT, b INT, c INT) ENGINE='MyISAM';
+CREATE TABLE t6 (a INT, b INT, c INT) ENGINE='MyISAM';
+CREATE TABLE t9 (a INT) ENGINE='MyISAM';
+ALTER TABLE t1_int ADD x INT DEFAULT 42;
+ALTER TABLE t1_bit ADD x BIT(3) DEFAULT b'011';
+ALTER TABLE t1_char ADD x CHAR(20) DEFAULT 'Just a test';
+ALTER TABLE t1_nodef ADD x INT NOT NULL;
+ALTER TABLE t2 DROP b;
 ALTER TABLE t4 MODIFY a FLOAT;
 ALTER TABLE t5 MODIFY b FLOAT;
 ALTER TABLE t6 MODIFY c FLOAT;
-INSERT INTO t9 VALUES (1);
-INSERT INTO t1 VALUES (1,2);
+INSERT INTO t1_int  VALUES (2,4,4711);
+INSERT INTO t1_char VALUES (2,4,'Foo is a bar');
+INSERT INTO t1_bit  VALUES (2,4,b'101');
+**** On Master ****
+INSERT INTO t1_int VALUES (1,2);
+INSERT INTO t1_int VALUES (2,5);
+INSERT INTO t1_bit VALUES (1,2);
+INSERT INTO t1_bit VALUES (2,5);
+INSERT INTO t1_char VALUES (1,2);
+INSERT INTO t1_char VALUES (2,5);
+SELECT * FROM t1_int;
+a	b
+1	2
+2	5
+SELECT * FROM t1_bit;
+a	b
+1	2
+2	5
+SELECT * FROM t1_char;
+a	b
+1	2
+2	5
+**** On Slave ****
+SELECT a,b,x FROM t1_int;
+a	b	x
+2	5	4711
+1	2	42
+SELECT a,b,HEX(x) FROM t1_bit;
+a	b	HEX(x)
+2	5	5
+1	2	3
+SELECT a,b,x FROM t1_char;
+a	b	x
+2	5	Foo is a bar
+1	2	Just a test
+INSERT INTO t9 VALUES (2);
+INSERT INTO t1_nodef VALUES (1,2);
 SHOW SLAVE STATUS;
 Slave_IO_State	#
 Master_Host	127.0.0.1
@@ -26,7 +69,7 @@ Master_User	root
 Master_Port	MASTER_PORT
 Connect_Retry	1
 Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1042
+Read_Master_Log_Pos	1934
 Relay_Log_File	#
 Relay_Log_Pos	#
 Relay_Master_Log_File	master-bin.000001
@@ -38,10 +81,10 @@ Replicate_Do_Table
 Replicate_Ignore_Table	
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
-Last_Errno	1454
-Last_Error	Table width mismatch - received 2 columns, test.t1 has 3 columns
+Last_Errno	1364
+Last_Error	Error in Write_rows event: error during transaction execution on table test.t1_nodef
 Skip_Counter	0
-Exec_Master_Log_Pos	968
+Exec_Master_Log_Pos	1850
 Relay_Log_Space	#
 Until_Condition	None
 Until_Log_File	
@@ -64,45 +107,7 @@ Master_User	root
 Master_Port	MASTER_PORT
 Connect_Retry	1
 Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1185
-Relay_Log_File	#
-Relay_Log_Pos	#
-Relay_Master_Log_File	master-bin.000001
-Slave_IO_Running	Yes
-Slave_SQL_Running	No
-Replicate_Do_DB	
-Replicate_Ignore_DB	
-Replicate_Do_Table	
-Replicate_Ignore_Table	
-Replicate_Wild_Do_Table	
-Replicate_Wild_Ignore_Table	
-Last_Errno	1454
-Last_Error	Table width mismatch - received 2 columns, test.t2 has 3 columns
-Skip_Counter	0
-Exec_Master_Log_Pos	1111
-Relay_Log_Space	#
-Until_Condition	None
-Until_Log_File	
-Until_Log_Pos	0
-Master_SSL_Allowed	No
-Master_SSL_CA_File	
-Master_SSL_CA_Path	
-Master_SSL_Cert	
-Master_SSL_Cipher	
-Master_SSL_Key	
-Seconds_Behind_Master	#
-SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
-START SLAVE;
-INSERT INTO t9 VALUES (3);
-INSERT INTO t3 VALUES (3,6);
-SHOW SLAVE STATUS;
-Slave_IO_State	#
-Master_Host	127.0.0.1
-Master_User	root
-Master_Port	MASTER_PORT
-Connect_Retry	1
-Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1328
+Read_Master_Log_Pos	2085
 Relay_Log_File	#
 Relay_Log_Pos	#
 Relay_Master_Log_File	master-bin.000001
@@ -114,10 +119,10 @@ Replicate_Do_Table
 Replicate_Ignore_Table	
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
-Last_Errno	1454
-Last_Error	Table width mismatch - received 2 columns, test.t3 has 3 columns
+Last_Errno	1514
+Last_Error	Table width mismatch - received 2 columns, test.t2 has 1 columns
 Skip_Counter	0
-Exec_Master_Log_Pos	1254
+Exec_Master_Log_Pos	2007
 Relay_Log_Space	#
 Until_Condition	None
 Until_Log_File	
@@ -140,7 +145,7 @@ Master_User	root
 Master_Port	MASTER_PORT
 Connect_Retry	1
 Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1466
+Read_Master_Log_Pos	2231
 Relay_Log_File	#
 Relay_Log_Pos	#
 Relay_Master_Log_File	master-bin.000001
@@ -152,10 +157,10 @@ Replicate_Do_Table
 Replicate_Ignore_Table	
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
-Last_Errno	1454
+Last_Errno	1514
 Last_Error	Column 0 type mismatch - received type 3, test.t4 has type 4
 Skip_Counter	0
-Exec_Master_Log_Pos	1397
+Exec_Master_Log_Pos	2158
 Relay_Log_Space	#
 Until_Condition	None
 Until_Log_File	
@@ -178,7 +183,7 @@ Master_User	root
 Master_Port	MASTER_PORT
 Connect_Retry	1
 Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1614
+Read_Master_Log_Pos	2387
 Relay_Log_File	#
 Relay_Log_Pos	#
 Relay_Master_Log_File	master-bin.000001
@@ -190,10 +195,10 @@ Replicate_Do_Table
 Replicate_Ignore_Table	
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
-Last_Errno	1454
+Last_Errno	1514
 Last_Error	Column 1 type mismatch - received type 3, test.t5 has type 4
 Skip_Counter	0
-Exec_Master_Log_Pos	1535
+Exec_Master_Log_Pos	2304
 Relay_Log_Space	#
 Until_Condition	None
 Until_Log_File	
@@ -216,7 +221,7 @@ Master_User	root
 Master_Port	MASTER_PORT
 Connect_Retry	1
 Master_Log_File	master-bin.000001
-Read_Master_Log_Pos	1762
+Read_Master_Log_Pos	2543
 Relay_Log_File	#
 Relay_Log_Pos	#
 Relay_Master_Log_File	master-bin.000001
@@ -228,10 +233,10 @@ Replicate_Do_Table
 Replicate_Ignore_Table	
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
-Last_Errno	1454
+Last_Errno	1514
 Last_Error	Column 2 type mismatch - received type 3, test.t6 has type 4
 Skip_Counter	0
-Exec_Master_Log_Pos	1683
+Exec_Master_Log_Pos	2460
 Relay_Log_Space	#
 Until_Condition	None
 Until_Log_File	
@@ -245,4 +250,5 @@ Master_SSL_Key
 Seconds_Behind_Master	#
 SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
 START SLAVE;
-DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t9;
+DROP TABLE IF EXISTS t1_int,t1_bit,t1_char,t1_nodef;
+DROP TABLE IF EXISTS t2,t3,t4,t5,t6,t9;

mysql-test/t/rpl_row_tabledefs.test

+
+-- source include/have_binlog_format_row.inc
+-- source include/master-slave.inc
+
+let $engine_type = 'MyISAM';
+-- source extra/rpl_tests/rpl_row_tabledefs.test
+
+

sql/Makefile.am

@@ -53,7 +53,7 @@ noinst_HEADERS =	item.h item_func.h item_sum.h item_cmpfunc.h \
 			sql_manager.h sql_map.h sql_string.h unireg.h \
 			sql_error.h field.h handler.h mysqld_suffix.h \
 			ha_heap.h ha_myisam.h ha_myisammrg.h ha_partition.h \
-			opt_range.h protocol.h rpl_tblmap.h \
+			opt_range.h protocol.h rpl_tblmap.h rpl_utility.h \
 			log.h sql_show.h rpl_rli.h \
 			sql_select.h structs.h table.h sql_udf.h hash_filo.h\
 			lex.h lex_symbol.h sql_acl.h sql_crypt.h  \
@@ -91,7 +91,7 @@ mysqld_SOURCES =	sql_lex.cc sql_handler.cc sql_partition.cc \
 			sql_load.cc mf_iocache.cc field_conv.cc sql_show.cc \
 			sql_udf.cc sql_analyse.cc sql_analyse.h sql_cache.cc \
 			slave.cc sql_repl.cc rpl_filter.cc rpl_tblmap.cc \
-			rpl_injector.cc \
+			rpl_utility.cc rpl_injector.cc \
                         sql_union.cc sql_derived.cc \
 			client.c sql_client.cc mini_client_errors.c pack.c\
 			stacktrace.c repl_failsafe.h repl_failsafe.cc \

sql/field.cc

@@ -8259,6 +8259,14 @@ const char *Field_bit::unpack(char *to, const char *from)
 }
 
 
+void Field_bit::set_default()
+{
+  my_ptrdiff_t const offset= table->s->default_values - table->record[0];
+  uchar bits= get_rec_bits(bit_ptr + offset, bit_ofs, bit_len);
+  set_rec_bits(bits, bit_ptr, bit_ofs, bit_len);
+  Field::set_default();
+}
+
 /*
   Bit field support for non-MyISAM tables.
 */

sql/field.h

@@ -1384,6 +1384,8 @@ public:
   void sql_type(String &str) const;
   char *pack(char *to, const char *from, uint max_length=~(uint) 0);
   const char *unpack(char* to, const char *from);
+  virtual void set_default();
+
   Field *new_key_field(MEM_ROOT *root, struct st_table *new_table,
                        char *new_ptr, uchar *new_null_ptr,
                        uint new_null_bit);

sql/log_event.h

@@ -1854,6 +1854,7 @@ protected:
   ulong       m_table_id;	/* Table ID */
   MY_BITMAP   m_cols;		/* Bitmap denoting columns available */
   ulong       m_width;          /* The width of the columns bitmap */
+  ulong       m_master_reclength; /* Length of record on master side */
 
   /* Bit buffer in the same memory as the class */
   uint32    m_bitbuf[128/(sizeof(uint32)*8)];
@@ -1907,12 +1908,15 @@ private:
       since SQL thread specific data is not available: that data is made
       available for the do_exec function.
 
-    RETURN VALUE
       A pointer to the start of the next row, or NULL if the preparation
       failed. Currently, preparation cannot fail, but don't rely on this
       behavior. 
+
+    RETURN VALUE
+      Error code, if something went wrong, 0 otherwise.
    */
-  virtual char const *do_prepare_row(THD*, TABLE*, char const *row_start) = 0;
+  virtual int do_prepare_row(THD*, RELAY_LOG_INFO*, TABLE*,
+                             char const *row_start, char const **row_end) = 0;
 
   /*
     Primitive to do the actual execution necessary for a row.
@@ -1980,10 +1984,11 @@ private:
   gptr  m_memory;
   byte *m_after_image;
 
-  virtual int         do_before_row_operations(TABLE *table);
-  virtual int         do_after_row_operations(TABLE *table, int error);
-  virtual char const *do_prepare_row(THD*, TABLE*, char const *row_start);
-  virtual int         do_exec_row(TABLE *table);
+  virtual int do_before_row_operations(TABLE *table);
+  virtual int do_after_row_operations(TABLE *table, int error);
+  virtual int do_prepare_row(THD*, RELAY_LOG_INFO*, TABLE*,
+                             char const *row_start, char const **row_end);
+  virtual int do_exec_row(TABLE *table);
 #endif
 };
 
@@ -2044,10 +2049,11 @@ private:
   byte *m_key;
   byte *m_after_image;
 
-  virtual int         do_before_row_operations(TABLE *table);
-  virtual int         do_after_row_operations(TABLE *table, int error);
-  virtual char const *do_prepare_row(THD*, TABLE*, char const *row_start);
-  virtual int         do_exec_row(TABLE *table);
+  virtual int do_before_row_operations(TABLE *table);
+  virtual int do_after_row_operations(TABLE *table, int error);
+  virtual int do_prepare_row(THD*, RELAY_LOG_INFO*, TABLE*,
+                             char const *row_start, char const **row_end);
+  virtual int do_exec_row(TABLE *table);
 #endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
 };
 
@@ -2114,10 +2120,11 @@ private:
   byte *m_key;
   byte *m_after_image;
 
-  virtual int         do_before_row_operations(TABLE *table);
-  virtual int         do_after_row_operations(TABLE *table, int error);
-  virtual char const *do_prepare_row(THD*, TABLE*, char const *row_start);
-  virtual int         do_exec_row(TABLE *table);
+  virtual int do_before_row_operations(TABLE *table);
+  virtual int do_after_row_operations(TABLE *table, int error);
+  virtual int do_prepare_row(THD*, RELAY_LOG_INFO*, TABLE*,
+                             char const *row_start, char const **row_end);
+  virtual int do_exec_row(TABLE *table);
 #endif
 };
 

sql/mysql_priv.h

@@ -21,6 +21,9 @@
   except the part which must be in the server and in the client.
 */
 
+#ifndef MYSQL_PRIV_H
+#define MYSQL_PRIV_H
+
 #ifndef MYSQL_CLIENT
 
 #include <my_global.h>
@@ -1773,3 +1776,5 @@ bool schema_table_store_record(THD *thd, TABLE *table);
 
 #endif /* MYSQL_SERVER */
 #endif /* MYSQL_CLIENT */
+
+#endif /* MYSQL_PRIV_H */

sql/rpl_utility.cc

+/* Copyright 2006 MySQL AB. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "rpl_utility.h"
+
+uint32
+field_length_from_packed(enum_field_types const field_type, 
+                         byte const *const data)
+{
+  uint32 length;
+
+  switch (field_type) {
+  case MYSQL_TYPE_DECIMAL:
+  case MYSQL_TYPE_NEWDECIMAL:
+    length= ~0UL;
+    break;
+  case MYSQL_TYPE_YEAR:
+  case MYSQL_TYPE_TINY:
+    length= 1;
+    break;
+  case MYSQL_TYPE_SHORT:
+    length= 2;
+    break;
+  case MYSQL_TYPE_INT24:
+    length= 3;
+    break;
+  case MYSQL_TYPE_LONG:
+    length= 4;
+    break;
+#ifdef HAVE_LONG_LONG
+  case MYSQL_TYPE_LONGLONG:
+    length= 8;
+    break;
+#endif
+  case MYSQL_TYPE_FLOAT:
+    length= sizeof(float);
+    break;
+  case MYSQL_TYPE_DOUBLE:
+    length= sizeof(double);
+    break;
+  case MYSQL_TYPE_NULL:
+    length= 0;
+    break;
+  case MYSQL_TYPE_NEWDATE:
+    length= 3;
+    break;
+  case MYSQL_TYPE_DATE:
+    length= 4;
+    break;
+  case MYSQL_TYPE_TIME:
+    length= 3;
+    break;
+  case MYSQL_TYPE_TIMESTAMP:
+    length= 4;
+    break;
+  case MYSQL_TYPE_DATETIME:
+    length= 8;
+    break;
+    break;
+  case MYSQL_TYPE_BIT:
+    length= ~0UL;
+    break;
+  default:
+    /* This case should never be chosen */
+    DBUG_ASSERT(0);
+    /* If something goes awfully wrong, it's better to get a string than die */
+  case MYSQL_TYPE_STRING:
+    length= uint2korr(data);
+    break;
+
+  case MYSQL_TYPE_ENUM:
+  case MYSQL_TYPE_SET:
+  case MYSQL_TYPE_VAR_STRING:
+  case MYSQL_TYPE_VARCHAR:
+    length= ~0UL;                               // NYI
+    break;
+
+  case MYSQL_TYPE_TINY_BLOB:
+  case MYSQL_TYPE_MEDIUM_BLOB:
+  case MYSQL_TYPE_LONG_BLOB:
+  case MYSQL_TYPE_BLOB:
+  case MYSQL_TYPE_GEOMETRY:
+    length= ~0UL;                               // NYI
+    break;
+  }
+}
+
+/*********************************************************************
+ *                   table_def member definitions                    *
+ *********************************************************************/
+
+/*
+  Is the definition compatible with a table?
+
+  Compare the definition with a table to see if it is compatible with
+  it.  A table definition is compatible with a table if
+  - the columns types of the table definition is a (not necessarily
+    proper) prefix of the column type of the table, or
+  - the other way around
+*/
+int
+table_def::compatible_with(RELAY_LOG_INFO *rli, TABLE *table)
+  const
+{
+  /*
+    We only check the initial columns for the tables.
+  */
+  uint const cols_to_check= min(table->s->fields, size());
+  int error= 0;
+
+  TABLE_SHARE const *const tsh= table->s;
+
+  /*
+    To get proper error reporting for all columns of the table, we
+    both check the width and iterate over all columns.
+  */
+  if (tsh->fields < size())
+  {
+    DBUG_ASSERT(tsh->db.str && tsh->table_name.str);
+    error= 1;
+    slave_print_msg(ERROR_LEVEL, rli, ER_BINLOG_ROW_WRONG_TABLE_DEF,
+                    "Table width mismatch - "
+                    "received %u columns, %s.%s has %u columns",
+                    size(), tsh->db.str, tsh->table_name.str, tsh->fields);
+  }
+
+  for (uint col= 0 ; col < cols_to_check ; ++col)
+  {
+    if (table->field[col]->type() != type(col))
+    {
+      DBUG_ASSERT(col < size() && col < tsh->fields);
+      DBUG_ASSERT(tsh->db.str && tsh->table_name.str);
+      error= 1;
+      slave_print_msg(ERROR_LEVEL, rli, ER_BINLOG_ROW_WRONG_TABLE_DEF,
+                      "Column %d type mismatch - "
+                      "received type %d, %s.%s has type %d",
+                      col, type(col), tsh->db.str, tsh->table_name.str,
+                      table->field[col]->type());
+    }
+  }
+
+  return error;
+}

sql/rpl_utility.h

+/* Copyright 2006 MySQL AB. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef RPL_UTILITY_H
+#define RPL_UTILITY_H
+
+#ifndef __cplusplus
+#error "Don't include this C++ header file from a non-C++ file!"
+#endif
+
+#include "mysql_priv.h"
+
+uint32
+field_length_from_packed(enum_field_types const field_type, 
+                         byte const *const data);
+
+/*
+  A table definition from the master.
+
+  RESPONSIBILITIES
+
+  - Extract table definition data from the table map event
+  - Check if table definition in table map is compatible with table
+    definition on slave
+ */
+
+class table_def
+{
+public:
+  typedef unsigned char field_type;
+
+  table_def(field_type *t, my_size_t s)
+    : m_type(t), m_size(s)
+  {
+  }
+
+  my_size_t size() const { return m_size; }
+  field_type type(my_ptrdiff_t i) const { return m_type[i]; }
+
+  int compatible_with(RELAY_LOG_INFO *rli, TABLE *table) const;
+
+private:
+  my_size_t m_size;
+  field_type *m_type;
+};
+
+#endif /* RPL_UTILITY_H */