BUG 53893: automerged bug branch into mysql-5.1-bugteam latest.

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

@@ -24,3 +24,15 @@ INSERT INTO t VALUES (1,2,4);
 INSERT INTO t VALUES (4,3,4);
 DELETE FROM t;
 DROP TABLE t;
+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+CREATE TABLE t1 (c1 INT NOT NULL, c2 INT NOT NULL, c3 INT, UNIQUE KEY(c1,c3), KEY(c2));
+INSERT INTO t1(c1,c2) VALUES(1,1);
+INSERT INTO t1(c1,c2) VALUES(1,2);
+UPDATE t1 SET c1=1000 WHERE c2=2;
+Comparing tables master:test.t1 and slave:test.t1
+DROP TABLE t1;

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

@@ -71,3 +71,34 @@ DELETE FROM t;
 DROP TABLE t;
 
 -- sync_slave_with_master
+
+#
+# BUG#53893: RBR: nullable unique key can lead to out-of-sync slave
+#
+
+#
+# We insert two rows. Both with part of UNIQUE KEY set to null.
+# Then we update the last row inserted. On master the correct
+# row is updated. On the slave the wrong row would be updated
+# because the engine would look it up by the NULL Unique KEY.
+# As a consquence, the wrong row would be updated.
+#
+
+-- connection master
+-- source include/master-slave-reset.inc
+-- connection master
+
+CREATE TABLE t1 (c1 INT NOT NULL, c2 INT NOT NULL, c3 INT, UNIQUE KEY(c1,c3), KEY(c2));
+INSERT INTO t1(c1,c2) VALUES(1,1);
+INSERT INTO t1(c1,c2) VALUES(1,2);
+UPDATE t1 SET c1=1000 WHERE c2=2;
+-- sync_slave_with_master
+
+-- let $diff_table_1=master:test.t1
+-- let $diff_table_2=slave:test.t1
+-- source include/diff_tables.inc
+
+-- connection master
+DROP TABLE t1;
+-- sync_slave_with_master
+

sql/log_event.cc

@@ -9015,8 +9015,38 @@ int Rows_log_event::find_row(const Relay_log_info *rli)
     */
     if (table->key_info->flags & HA_NOSAME)
     {
-      table->file->ha_index_end();
+      /* Unique does not have non nullable part */
-      goto ok;
+      if (!(table->key_info->flags & (HA_NULL_PART_KEY)))
+      {
+        table->file->ha_index_end();
+        goto ok;
+      }
+      else
+      {
+        KEY *keyinfo= table->key_info;
+        /*
+          Unique has nullable part. We need to check if there is any field in the
+          BI image that is null and part of UNNI.
+        */
+        bool null_found= FALSE;
+
+        for (uint i=0, fieldnr= keyinfo->key_part[i].fieldnr - 1 ;
+             (i < keyinfo->key_parts) && !null_found ;
+             i++, fieldnr= keyinfo->key_part[i].fieldnr - 1)
+        {
+          Field **f= table->field+fieldnr;
+          if ((*f)->is_null())
+            null_found= TRUE;
+        }
+
+        if (!null_found)
+        {
+          table->file->ha_index_end();
+          goto ok;
+        }
+
+        /* else fall through to index scan */
+      }
     }
 
     /*

sql/log_event_old.cc

@@ -2428,8 +2428,38 @@ int Old_rows_log_event::find_row(const Relay_log_info *rli)
     */
     if (table->key_info->flags & HA_NOSAME)
     {
-      table->file->ha_index_end();
+      /* Unique does not have non nullable part */
-      DBUG_RETURN(0);
+      if (!(table->key_info->flags & (HA_NULL_PART_KEY)))
+      {
+        table->file->ha_index_end();
+        DBUG_RETURN(0);
+      }
+      else
+      {
+        KEY *keyinfo= table->key_info;
+        /*
+          Unique has nullable part. We need to check if there is any field in the
+          BI image that is null and part of UNNI.
+        */
+        bool null_found= FALSE;
+
+        for (uint i=0, fieldnr= keyinfo->key_part[i].fieldnr - 1 ;
+             (i < keyinfo->key_parts) && !null_found ;
+             i++, fieldnr= keyinfo->key_part[i].fieldnr - 1)
+        {
+          Field **f= table->field+fieldnr;
+          if ((*f)->is_null())
+            null_found= TRUE;
+        }
+
+        if (!null_found)
+        {
+          table->file->ha_index_end();
+          DBUG_RETURN(0);
+        }
+
+        /* else fall through to index scan */
+      }
     }
 
     /*