WL#3228 (NDB) : RBR using different table defs on slave/master

This patch adds the ability to store extra field metadata in the table
map event. This data can include pack_length() or field_lenght() for
fields such as CHAR or VARCHAR enabling developers to add code that
can check for compatibilty between master and slave columns. More 
importantly, the extra field metadata can be used to store data from the
master correctly should a VARCHAR field on the master be <= 255 bytes 
while the same field on the slave is > 255 bytes. 

The patch also includes the needed changes to unpack to ensure that data
which is smaller on the master can be unpacked correctly on the slave.

WL#3915 : (NDB) master's cols > slave

Slave starts accepting and handling rows of master's tables which have more columns.
The most important part of implementation is how to caclulate the amount of bytes to
skip for unknown by slave column.

1 files changed, 10 insertions, 0 deletions

diff --git a/sql/rpl_rli.h b/sql/rpl_rli.h
index c458318594a..7ae21897e3f 100644
--- a/sql/rpl_rli.h
+++ b/sql/rpl_rli.h
@@ -18,6 +18,7 @@
 
 #include "rpl_tblmap.h"
 #include "rpl_reporting.h"
+#include "rpl_utility.h"
 
 struct RPL_TABLE_LIST;
 
@@ -301,6 +302,15 @@ typedef struct st_relay_log_info : public Slave_reporting_capability
   uint tables_to_lock_count;        /* RBR: Count of tables to lock */
   table_mapping m_table_map;      /* RBR: Mapping table-id to table */
 
+  inline table_def *get_tabledef(TABLE *tbl)
+  {
+    table_def *td= 0;
+    for (TABLE_LIST *ptr= tables_to_lock; ptr && !td; ptr= ptr->next_global)
+      if (ptr->table == tbl)
+        td= &((RPL_TABLE_LIST *)ptr)->m_tabledef;
+    return (td);
+  }
+
   /*
     Last charset (6 bytes) seen by slave SQL thread is cached here; it helps
     the thread save 3 get_charset() per Query_log_event if the charset is not