BUG#31581: 5.1-telco-6.1 -> 5.1.22. Slave crashes during starting

This patch has two purposes:
(1) To refactor the code so that
   {Write|Update|Delete}_rows_log_event_old does not use code from
   {Write|Update|Delete}_rows_log_event. Before refactoring there
   was the following problem: whenever we modifed the code for new
   events, it affected the old events. This is bad, as it makes
   maintainance difficult. After refactoring, we can safely edit the
   new code without affecting old events. So, if we for instance
   modify the binary format of new events, we no longer need to worry
   about how the new code reads old events.
(2) To fix BUG#31581.

These two objectives are reached by the following changes:
 - Merged Rows_log_event into Old_rows_log_event and
   {Write|Update|Delete}_rows_log_event into
   {Write|Update|Delete}_rows_log_event_old.
 - Fixed the bug by replacing {WRITE|UPDATE|DELETE}_ROWS_EVENT by
   PRE_GA_{WRITE|UPDATE|DELETE}_ROWS_EVENT.
 - Added comments to log_event_old.h

(This patch is identical to the previously committed patch which was
a collapse of three changesets, except that it adds assert(0) to
constructors for old types of row log events that should never be
called.)


sql/log_event_old.cc:
  Merged Rows_log_event into Old_rows_log_event and
  {Write|Update|Delete}_rows_log_event into
  {Write|Update|Delete}_rows_log_event_old. Also fixed the bug by
  replacing {WRITE|UPDATE|DELETE}_ROWS_EVENT by
  PRE_GA_{WRITE|UPDATE|DELETE}_ROWS_EVENT.
sql/log_event_old.h:
  Merged Rows_log_event into Old_rows_log_event and
  {Write|Update|Delete}_rows_log_event into
  {Write|Update|Delete}_rows_log_event_old. Also added comment
  explaining what the file contains and what the classes do.

4 files changed, 2249 insertions, 72 deletions

diff --git a/mysql-test/r/bdb_notembedded.result b/mysql-test/r/bdb_notembedded.result
new file mode 100644
index 00000000000..14cb5fad915
--- /dev/null
+++ b/mysql-test/r/bdb_notembedded.result
@@ -0,0 +1,35 @@
+set autocommit=1;
+reset master;
+create table bug16206 (a int);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+show binlog events;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+f	n	Format_desc	1	n	Server ver: VERSION, Binlog ver: 4
+f	n	Query	1	n	use `test`; create table bug16206 (a int)
+f	n	Query	1	n	use `test`; insert into bug16206 values(1)
+f	n	Query	1	n	use `test`; insert into bug16206 values(2)
+drop table bug16206;
+reset master;
+create table bug16206 (a int) engine=         bdb;
+insert into bug16206 values(0);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+insert into bug16206 values(3);
+show binlog events;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+f	n	Format_desc	1	n	Server ver: VERSION, Binlog ver: 4
+f	n	Query	1	n	use `test`; create table bug16206 (a int) engine=         bdb
+f	n	Query	1	n	use `test`; insert into bug16206 values(0)
+f	n	Query	1	n	use `test`; insert into bug16206 values(1)
+f	n	Query	1	n	use `test`; BEGIN
+f	n	Query	1	n	use `test`; insert into bug16206 values(2)
+f	n	Query	1	n	use `test`; COMMIT
+f	n	Query	1	n	use `test`; insert into bug16206 values(3)
+drop table bug16206;
+set autocommit=0;
+End of 5.0 tests
diff --git a/mysql-test/t/bdb_notembedded.test b/mysql-test/t/bdb_notembedded.test
new file mode 100644
index 00000000000..24e64ebbfb2
--- /dev/null
+++ b/mysql-test/t/bdb_notembedded.test
@@ -0,0 +1,38 @@
+-- source include/not_embedded.inc
+-- source include/have_bdb.inc
+
+#
+# Bug #16206: Superfluous COMMIT event in binlog when updating BDB in autocommit mode
+#
+set autocommit=1;
+
+let $VERSION=`select version()`;
+
+reset master;
+create table bug16206 (a int);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+--replace_result $VERSION VERSION
+--replace_column 1 f 2 n 5 n
+show binlog events;
+drop table bug16206;
+
+reset master;
+create table bug16206 (a int) engine=         bdb;
+insert into bug16206 values(0);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+insert into bug16206 values(3);
+--replace_result $VERSION VERSION
+--replace_column 1 f 2 n 5 n
+show binlog events;
+drop table bug16206;
+
+set autocommit=0;
+
+
+--echo End of 5.0 tests
diff --git a/sql/log_event_old.cc b/sql/log_event_old.cc
index 949179386ea..e9b7f50ee3b 100644
--- a/sql/log_event_old.cc
+++ b/sql/log_event_old.cc
@@ -11,9 +11,9 @@
 
 // Old implementation of do_apply_event()
 int 
-Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli)
+Old_rows_log_event::do_apply_event(Old_rows_log_event *ev, const Relay_log_info *rli)
 {
-  DBUG_ENTER("Rows_log_event::do_apply_event(st_relay_log_info*)");
+  DBUG_ENTER("Old_rows_log_event::do_apply_event(st_relay_log_info*)");
   int error= 0;
   THD *thd= ev->thd;
   uchar const *row_start= ev->m_rows_buf;
@@ -30,7 +30,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
        This one is supposed to be set: just an extra check so that
        nothing strange has happened.
      */
-    DBUG_ASSERT(ev->get_flags(Rows_log_event::STMT_END_F));
+    DBUG_ASSERT(ev->get_flags(Old_rows_log_event::STMT_END_F));
 
     const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
     close_thread_tables(thd);
@@ -148,7 +148,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
           thd->lock= 0;
           thd->query_error= 1;
           const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
-          DBUG_RETURN(Rows_log_event::ERR_BAD_TABLE_DEF);
+          DBUG_RETURN(Old_rows_log_event::ERR_BAD_TABLE_DEF);
         }
       }
     }
@@ -163,8 +163,8 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
       TODO [/Matz]: Maybe the query cache should not be invalidated
       here? It might be that a table is not changed, even though it
       was locked for the statement.  We do know that each
-      Rows_log_event contain at least one row, so after processing one
-      Rows_log_event, we can invalidate the query cache for the
+      Old_rows_log_event contain at least one row, so after processing one
+      Old_rows_log_event, we can invalidate the query cache for the
       associated table.
      */
     for (TABLE_LIST *ptr= rli->tables_to_lock ; ptr ; ptr= ptr->next_global)
@@ -200,12 +200,12 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
       Make sure to set/clear them before executing the main body of
       the event.
     */
-    if (ev->get_flags(Rows_log_event::NO_FOREIGN_KEY_CHECKS_F))
+    if (ev->get_flags(Old_rows_log_event::NO_FOREIGN_KEY_CHECKS_F))
         thd->options|= OPTION_NO_FOREIGN_KEY_CHECKS;
     else
         thd->options&= ~OPTION_NO_FOREIGN_KEY_CHECKS;
 
-    if (ev->get_flags(Rows_log_event::RELAXED_UNIQUE_CHECKS_F))
+    if (ev->get_flags(Old_rows_log_event::RELAXED_UNIQUE_CHECKS_F))
         thd->options|= OPTION_RELAXED_UNIQUE_CHECKS;
     else
         thd->options&= ~OPTION_RELAXED_UNIQUE_CHECKS;
@@ -275,7 +275,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
     We need to delay this clear until the table def is no longer needed.
     The table def is needed in unpack_row().
   */
-  if (rli->tables_to_lock && ev->get_flags(Rows_log_event::STMT_END_F))
+  if (rli->tables_to_lock && ev->get_flags(Old_rows_log_event::STMT_END_F))
     const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
 
   if (error)
@@ -311,7 +311,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
   */
   if (table && (table->s->primary_key == MAX_KEY) &&
       !ev->cache_stmt && 
-      ev->get_flags(Rows_log_event::STMT_END_F) == Rows_log_event::RLE_NO_FLAGS)
+      ev->get_flags(Old_rows_log_event::STMT_END_F) == Old_rows_log_event::RLE_NO_FLAGS)
   {
     /*
       ------------ Temporary fix until WL#2975 is implemented ---------
@@ -323,7 +323,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
       present, and idempotency is not guaranteed (no PK) so we risk
       that repeating leads to double insert. So we desperately try to
       continue, hope we'll eventually leave this buggy situation (by
-      executing the final Rows_log_event). If we are in a hopeless
+      executing the final Old_rows_log_event). If we are in a hopeless
       wait (reached end of last relay log and nothing gets appended
       there), we timeout after one minute, and notify DBA about the
       problem.  When WL#2975 is implemented, just remove the member
@@ -336,6 +336,7 @@ Old_rows_log_event::do_apply_event(Rows_log_event *ev, const Relay_log_info *rli
 }
 #endif
 
+
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
 
 /*
@@ -350,6 +351,7 @@ last_uniq_key(TABLE *table, uint keyno)
   return 1;
 }
 
+
 /*
   Compares table->record[0] and table->record[1]
 
@@ -428,6 +430,7 @@ record_compare_exit:
   return result;
 }
 
+
 /*
   Copy "extra" columns from record[1] to record[0].
 
@@ -516,6 +519,7 @@ copy_extra_record_fields(TABLE *table,
   DBUG_RETURN(0);                                     // All OK
 }
 
+
 /*
   Replace the provided record in the database.
 
@@ -668,6 +672,7 @@ replace_record(THD *thd, TABLE *table,
   DBUG_RETURN(error);
 }
 
+
 /**
   Find the row given by 'key', if the table has keys, or else use a table scan
   to find (and fetch) the row.
@@ -879,6 +884,7 @@ static int find_and_fetch_row(TABLE *table, uchar *key)
   DBUG_RETURN(0);
 }
 
+
 /**********************************************************
   Row handling primitives for Write_rows_log_event_old
  **********************************************************/
@@ -944,6 +950,7 @@ int Write_rows_log_event_old::do_before_row_operations(TABLE *table)
   return error;
 }
 
+
 int Write_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
 {
   int local_error= 0;
@@ -962,6 +969,7 @@ int Write_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
   return error? error : local_error;
 }
 
+
 int
 Write_rows_log_event_old::do_prepare_row(THD *thd_arg,
                                          Relay_log_info const *rli,
@@ -981,6 +989,7 @@ Write_rows_log_event_old::do_prepare_row(THD *thd_arg,
   return error;
 }
 
+
 int Write_rows_log_event_old::do_exec_row(TABLE *table)
 {
   DBUG_ASSERT(table != NULL);
@@ -988,6 +997,7 @@ int Write_rows_log_event_old::do_exec_row(TABLE *table)
   return error;
 }
 
+
 /**********************************************************
   Row handling primitives for Delete_rows_log_event_old
  **********************************************************/
@@ -1029,6 +1039,7 @@ int Delete_rows_log_event_old::do_before_row_operations(TABLE *table)
   return error;
 }
 
+
 int Delete_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
 {
   /*error= ToDo:find out what this should really be, this triggers close_scan in nbd, returning error?*/
@@ -1041,6 +1052,7 @@ int Delete_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
   return error;
 }
 
+
 int
 Delete_rows_log_event_old::do_prepare_row(THD *thd_arg,
                                           Relay_log_info const *rli,
@@ -1074,6 +1086,7 @@ Delete_rows_log_event_old::do_prepare_row(THD *thd_arg,
   return error;
 }
 
+
 int Delete_rows_log_event_old::do_exec_row(TABLE *table)
 {
   int error;
@@ -1091,6 +1104,7 @@ int Delete_rows_log_event_old::do_exec_row(TABLE *table)
   return error;
 }
 
+
 /**********************************************************
   Row handling primitives for Update_rows_log_event_old
  **********************************************************/
@@ -1124,6 +1138,7 @@ int Update_rows_log_event_old::do_before_row_operations(TABLE *table)
   return error;
 }
 
+
 int Update_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
 {
   /*error= ToDo:find out what this should really be, this triggers close_scan in nbd, returning error?*/
@@ -1136,6 +1151,7 @@ int Update_rows_log_event_old::do_after_row_operations(TABLE *table, int error)
   return error;
 }
 
+
 int Update_rows_log_event_old::do_prepare_row(THD *thd_arg,
                                               Relay_log_info const *rli,
                                               TABLE *table,
@@ -1179,6 +1195,7 @@ int Update_rows_log_event_old::do_prepare_row(THD *thd_arg,
   return error;
 }
 
+
 int Update_rows_log_event_old::do_exec_row(TABLE *table)
 {
   DBUG_ASSERT(table != NULL);
@@ -1217,3 +1234,1745 @@ int Update_rows_log_event_old::do_exec_row(TABLE *table)
 }
 
 #endif
+
+
+/**************************************************************************
+	Rows_log_event member functions
+**************************************************************************/
+
+#ifndef MYSQL_CLIENT
+Old_rows_log_event::Old_rows_log_event(THD *thd_arg, TABLE *tbl_arg, ulong tid,
+                                       MY_BITMAP const *cols,
+                                       bool is_transactional)
+  : Log_event(thd_arg, 0, is_transactional),
+    m_row_count(0),
+    m_table(tbl_arg),
+    m_table_id(tid),
+    m_width(tbl_arg ? tbl_arg->s->fields : 1),
+    m_rows_buf(0), m_rows_cur(0), m_rows_end(0), m_flags(0) 
+#ifdef HAVE_REPLICATION
+    ,m_key(NULL), m_curr_row(NULL), m_curr_row_end(NULL)
+#endif
+{
+
+  // This constructor should not be reached.
+  assert(0);
+
+  /*
+    We allow a special form of dummy event when the table, and cols
+    are null and the table id is ~0UL.  This is a temporary
+    solution, to be able to terminate a started statement in the
+    binary log: the extraneous events will be removed in the future.
+   */
+  DBUG_ASSERT(tbl_arg && tbl_arg->s && tid != ~0UL ||
+              !tbl_arg && !cols && tid == ~0UL);
+
+  if (thd_arg->options & OPTION_NO_FOREIGN_KEY_CHECKS)
+      set_flags(NO_FOREIGN_KEY_CHECKS_F);
+  if (thd_arg->options & OPTION_RELAXED_UNIQUE_CHECKS)
+      set_flags(RELAXED_UNIQUE_CHECKS_F);
+  /* if bitmap_init fails, caught in is_valid() */
+  if (likely(!bitmap_init(&m_cols,
+                          m_width <= sizeof(m_bitbuf)*8 ? m_bitbuf : NULL,
+                          m_width,
+                          false)))
+  {
+    /* Cols can be zero if this is a dummy binrows event */
+    if (likely(cols != NULL))
+    {
+      memcpy(m_cols.bitmap, cols->bitmap, no_bytes_in_map(cols));
+      create_last_word_mask(&m_cols);
+    }
+  }
+  else
+  {
+    // Needed because bitmap_init() does not set it to null on failure
+    m_cols.bitmap= 0;
+  }
+}
+#endif
+
+
+Old_rows_log_event::Old_rows_log_event(const char *buf, uint event_len,
+                                       Log_event_type event_type,
+                                       const Format_description_log_event
+                                       *description_event)
+  : Log_event(buf, description_event),
+    m_row_count(0),
+#ifndef MYSQL_CLIENT
+    m_table(NULL),
+#endif
+    m_table_id(0), m_rows_buf(0), m_rows_cur(0), m_rows_end(0)
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+    ,m_key(NULL), m_curr_row(NULL), m_curr_row_end(NULL)
+#endif
+{
+  DBUG_ENTER("Old_rows_log_event::Old_Rows_log_event(const char*,...)");
+  uint8 const common_header_len= description_event->common_header_len;
+  uint8 const post_header_len= description_event->post_header_len[event_type-1];
+
+  DBUG_PRINT("enter",("event_len: %u  common_header_len: %d  "
+		      "post_header_len: %d",
+		      event_len, common_header_len,
+		      post_header_len));
+
+  const char *post_start= buf + common_header_len;
+  post_start+= RW_MAPID_OFFSET;
+  if (post_header_len == 6)
+  {
+    /* Master is of an intermediate source tree before 5.1.4. Id is 4 bytes */
+    m_table_id= uint4korr(post_start);
+    post_start+= 4;
+  }
+  else
+  {
+    m_table_id= (ulong) uint6korr(post_start);
+    post_start+= RW_FLAGS_OFFSET;
+  }
+
+  m_flags= uint2korr(post_start);
+
+  uchar const *const var_start=
+    (const uchar *)buf + common_header_len + post_header_len;
+  uchar const *const ptr_width= var_start;
+  uchar *ptr_after_width= (uchar*) ptr_width;
+  DBUG_PRINT("debug", ("Reading from %p", ptr_after_width));
+  m_width = net_field_length(&ptr_after_width);
+  DBUG_PRINT("debug", ("m_width=%lu", m_width));
+  /* if bitmap_init fails, catched in is_valid() */
+  if (likely(!bitmap_init(&m_cols,
+                          m_width <= sizeof(m_bitbuf)*8 ? m_bitbuf : NULL,
+                          m_width,
+                          false)))
+  {
+    DBUG_PRINT("debug", ("Reading from %p", ptr_after_width));
+    memcpy(m_cols.bitmap, ptr_after_width, (m_width + 7) / 8);
+    create_last_word_mask(&m_cols);
+    ptr_after_width+= (m_width + 7) / 8;
+    DBUG_DUMP("m_cols", (uchar*) m_cols.bitmap, no_bytes_in_map(&m_cols));
+  }
+  else
+  {
+    // Needed because bitmap_init() does not set it to null on failure
+    m_cols.bitmap= NULL;
+    DBUG_VOID_RETURN;
+  }
+
+  m_cols_ai.bitmap= m_cols.bitmap; /* See explanation in is_valid() */
+
+  if (event_type == PRE_GA_UPDATE_ROWS_EVENT)
+  {
+    DBUG_PRINT("debug", ("Reading from %p", ptr_after_width));
+
+    /* if bitmap_init fails, caught in is_valid() */
+    if (likely(!bitmap_init(&m_cols_ai,
+                            m_width <= sizeof(m_bitbuf_ai)*8 ? m_bitbuf_ai : NULL,
+                            m_width,
+                            false)))
+    {
+      DBUG_PRINT("debug", ("Reading from %p", ptr_after_width));
+      memcpy(m_cols_ai.bitmap, ptr_after_width, (m_width + 7) / 8);
+      create_last_word_mask(&m_cols_ai);
+      ptr_after_width+= (m_width + 7) / 8;
+      DBUG_DUMP("m_cols_ai", (uchar*) m_cols_ai.bitmap,
+                no_bytes_in_map(&m_cols_ai));
+    }
+    else
+    {
+      // Needed because bitmap_init() does not set it to null on failure
+      m_cols_ai.bitmap= 0;
+      DBUG_VOID_RETURN;
+    }
+  }
+
+  const uchar* const ptr_rows_data= (const uchar*) ptr_after_width;
+
+  size_t const data_size= event_len - (ptr_rows_data - (const uchar *) buf);
+  DBUG_PRINT("info",("m_table_id: %lu  m_flags: %d  m_width: %lu  data_size: %lu",
+                     m_table_id, m_flags, m_width, (ulong) data_size));
+
+  m_rows_buf= (uchar*) my_malloc(data_size, MYF(MY_WME));
+  if (likely((bool)m_rows_buf))
+  {
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+    m_curr_row= m_rows_buf;
+#endif
+    m_rows_end= m_rows_buf + data_size;
+    m_rows_cur= m_rows_end;
+    memcpy(m_rows_buf, ptr_rows_data, data_size);
+  }
+  else
+    m_cols.bitmap= 0; // to not free it
+
+  DBUG_VOID_RETURN;
+}
+
+
+Old_rows_log_event::~Old_rows_log_event()
+{
+  if (m_cols.bitmap == m_bitbuf) // no my_malloc happened
+    m_cols.bitmap= 0; // so no my_free in bitmap_free
+  bitmap_free(&m_cols); // To pair with bitmap_init().
+  my_free((uchar*)m_rows_buf, MYF(MY_ALLOW_ZERO_PTR));
+}
+
+
+int Old_rows_log_event::get_data_size()
+{
+  int const type_code= get_type_code();
+
+  uchar buf[sizeof(m_width)+1];
+  uchar *end= net_store_length(buf, (m_width + 7) / 8);
+
+  DBUG_EXECUTE_IF("old_row_based_repl_4_byte_map_id_master",
+                  return 6 + no_bytes_in_map(&m_cols) + (end - buf) +
+                  (type_code == PRE_GA_UPDATE_ROWS_EVENT ? no_bytes_in_map(&m_cols_ai) : 0) +
+                  (m_rows_cur - m_rows_buf););
+  int data_size= ROWS_HEADER_LEN;
+  data_size+= no_bytes_in_map(&m_cols);
+  data_size+= end - buf;
+
+  if (type_code == PRE_GA_UPDATE_ROWS_EVENT)
+    data_size+= no_bytes_in_map(&m_cols_ai);
+
+  data_size+= (m_rows_cur - m_rows_buf);
+  return data_size; 
+}
+
+
+#ifndef MYSQL_CLIENT
+int Old_rows_log_event::do_add_row_data(uchar *row_data, size_t length)
+{
+  /*
+    When the table has a primary key, we would probably want, by default, to
+    log only the primary key value instead of the entire "before image". This
+    would save binlog space. TODO
+  */
+  DBUG_ENTER("Old_rows_log_event::do_add_row_data");
+  DBUG_PRINT("enter", ("row_data: 0x%lx  length: %lu", (ulong) row_data,
+                       (ulong) length));
+  /*
+    Don't print debug messages when running valgrind since they can
+    trigger false warnings.
+   */
+#ifndef HAVE_purify
+  DBUG_DUMP("row_data", row_data, min(length, 32));
+#endif
+
+  DBUG_ASSERT(m_rows_buf <= m_rows_cur);
+  DBUG_ASSERT(!m_rows_buf || m_rows_end && m_rows_buf < m_rows_end);
+  DBUG_ASSERT(m_rows_cur <= m_rows_end);
+
+  /* The cast will always work since m_rows_cur <= m_rows_end */
+  if (static_cast<size_t>(m_rows_end - m_rows_cur) <= length)
+  {
+    size_t const block_size= 1024;
+    my_ptrdiff_t const cur_size= m_rows_cur - m_rows_buf;
+    my_ptrdiff_t const new_alloc= 
+        block_size * ((cur_size + length + block_size - 1) / block_size);
+
+    uchar* const new_buf= (uchar*)my_realloc((uchar*)m_rows_buf, (uint) new_alloc,
+                                           MYF(MY_ALLOW_ZERO_PTR|MY_WME));
+    if (unlikely(!new_buf))
+      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+
+    /* If the memory moved, we need to move the pointers */
+    if (new_buf != m_rows_buf)
+    {
+      m_rows_buf= new_buf;
+      m_rows_cur= m_rows_buf + cur_size;
+    }
+
+    /*
+       The end pointer should always be changed to point to the end of
+       the allocated memory.
+    */
+    m_rows_end= m_rows_buf + new_alloc;
+  }
+
+  DBUG_ASSERT(m_rows_cur + length <= m_rows_end);
+  memcpy(m_rows_cur, row_data, length);
+  m_rows_cur+= length;
+  m_row_count++;
+  DBUG_RETURN(0);
+}
+#endif
+
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+int Old_rows_log_event::do_apply_event(Relay_log_info const *rli)
+{
+  DBUG_ENTER("Old_rows_log_event::do_apply_event(Relay_log_info*)");
+  int error= 0;
+
+  /*
+    If m_table_id == ~0UL, then we have a dummy event that does not
+    contain any data.  In that case, we just remove all tables in the
+    tables_to_lock list, close the thread tables, and return with
+    success.
+   */
+  if (m_table_id == ~0UL)
+  {
+    /*
+       This one is supposed to be set: just an extra check so that
+       nothing strange has happened.
+     */
+    DBUG_ASSERT(get_flags(STMT_END_F));
+
+    const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
+    close_thread_tables(thd);
+    thd->clear_error();
+    DBUG_RETURN(0);
+  }
+
+  /*
+    'thd' has been set by exec_relay_log_event(), just before calling
+    do_apply_event(). We still check here to prevent future coding
+    errors.
+  */
+  DBUG_ASSERT(rli->sql_thd == thd);
+
+  /*
+    If there is no locks taken, this is the first binrow event seen
+    after the table map events.  We should then lock all the tables
+    used in the transaction and proceed with execution of the actual
+    event.
+  */
+  if (!thd->lock)
+  {
+    bool need_reopen= 1; /* To execute the first lap of the loop below */
+
+    /*
+      lock_tables() reads the contents of thd->lex, so they must be
+      initialized. Contrary to in
+      Table_map_log_event::do_apply_event() we don't call
+      mysql_init_query() as that may reset the binlog format.
+    */
+    lex_start(thd);
+
+    while ((error= lock_tables(thd, rli->tables_to_lock,
+                               rli->tables_to_lock_count, &need_reopen)))
+    {
+      if (!need_reopen)
+      {
+        if (thd->query_error || thd->is_fatal_error)
+        {
+          /*
+            Error reporting borrowed from Query_log_event with many excessive
+            simplifications (we don't honour --slave-skip-errors)
+          */
+          uint actual_error= thd->net.last_errno;
+          rli->report(ERROR_LEVEL, actual_error,
+                      "Error '%s' in %s event: when locking tables",
+                      (actual_error ? thd->net.last_error :
+                       "unexpected success or fatal error"),
+                      get_type_str());
+          thd->is_fatal_error= 1;
+        }
+        else
+        {
+          rli->report(ERROR_LEVEL, error,
+                      "Error in %s event: when locking tables",
+                      get_type_str());
+        }
+        const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
+        DBUG_RETURN(error);
+      }
+
+      /*
+        So we need to reopen the tables.
+
+        We need to flush the pending RBR event, since it keeps a
+        pointer to an open table.
+
+        ALTERNATIVE SOLUTION (not implemented): Extract a pointer to
+        the pending RBR event and reset the table pointer after the
+        tables has been reopened.
+
+        NOTE: For this new scheme there should be no pending event:
+        need to add code to assert that is the case.
+       */
+      thd->binlog_flush_pending_rows_event(false);
+      TABLE_LIST *tables= rli->tables_to_lock;
+      close_tables_for_reopen(thd, &tables);
+
+      uint tables_count= rli->tables_to_lock_count;
+      if ((error= open_tables(thd, &tables, &tables_count, 0)))
+      {
+        if (thd->query_error || thd->is_fatal_error)
+        {
+          /*
+            Error reporting borrowed from Query_log_event with many excessive
+            simplifications (we don't honour --slave-skip-errors)
+          */
+          uint actual_error= thd->net.last_errno;
+          rli->report(ERROR_LEVEL, actual_error,
+                      "Error '%s' on reopening tables",
+                      (actual_error ? thd->net.last_error :
+                       "unexpected success or fatal error"));
+          thd->query_error= 1;
+        }
+        const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
+        DBUG_RETURN(error);
+      }
+    }
+
+    /*
+      When the open and locking succeeded, we check all tables to
+      ensure that they still have the correct type.
+
+      We can use a down cast here since we know that every table added
+      to the tables_to_lock is a RPL_TABLE_LIST.
+    */
+
+    {
+      RPL_TABLE_LIST *ptr= rli->tables_to_lock;
+      for ( ; ptr ; ptr= static_cast<RPL_TABLE_LIST*>(ptr->next_global))
+      {
+        if (ptr->m_tabledef.compatible_with(rli, ptr->table))
+        {
+          mysql_unlock_tables(thd, thd->lock);
+          thd->lock= 0;
+          thd->query_error= 1;
+          const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
+          DBUG_RETURN(ERR_BAD_TABLE_DEF);
+        }
+      }
+    }
+
+    /*
+      ... and then we add all the tables to the table map and remove
+      them from tables to lock.
+
+      We also invalidate the query cache for all the tables, since
+      they will now be changed.
+
+      TODO [/Matz]: Maybe the query cache should not be invalidated
+      here? It might be that a table is not changed, even though it
+      was locked for the statement.  We do know that each
+      Old_rows_log_event contain at least one row, so after processing one
+      Old_rows_log_event, we can invalidate the query cache for the
+      associated table.
+     */
+    for (TABLE_LIST *ptr= rli->tables_to_lock ; ptr ; ptr= ptr->next_global)
+    {
+      const_cast<Relay_log_info*>(rli)->m_table_map.set_table(ptr->table_id, ptr->table);
+    }
+#ifdef HAVE_QUERY_CACHE
+    query_cache.invalidate_locked_for_write(rli->tables_to_lock);
+#endif
+  }
+
+  TABLE* 
+    table= 
+    m_table= const_cast<Relay_log_info*>(rli)->m_table_map.get_table(m_table_id);
+
+  if (table)
+  {
+    /*
+      table == NULL means that this table should not be replicated
+      (this was set up by Table_map_log_event::do_apply_event()
+      which tested replicate-* rules).
+    */
+
+    /*
+      It's not needed to set_time() but
+      1) it continues the property that "Time" in SHOW PROCESSLIST shows how
+      much slave is behind
+      2) it will be needed when we allow replication from a table with no
+      TIMESTAMP column to a table with one.
+      So we call set_time(), like in SBR. Presently it changes nothing.
+    */
+    thd->set_time((time_t)when);
+    /*
+      There are a few flags that are replicated with each row event.
+      Make sure to set/clear them before executing the main body of
+      the event.
+    */
+    if (get_flags(NO_FOREIGN_KEY_CHECKS_F))
+        thd->options|= OPTION_NO_FOREIGN_KEY_CHECKS;
+    else
+        thd->options&= ~OPTION_NO_FOREIGN_KEY_CHECKS;
+
+    if (get_flags(RELAXED_UNIQUE_CHECKS_F))
+        thd->options|= OPTION_RELAXED_UNIQUE_CHECKS;
+    else
+        thd->options&= ~OPTION_RELAXED_UNIQUE_CHECKS;
+    /* A small test to verify that objects have consistent types */
+    DBUG_ASSERT(sizeof(thd->options) == sizeof(OPTION_RELAXED_UNIQUE_CHECKS));
+
+    /*
+      Now we are in a statement and will stay in a statement until we
+      see a STMT_END_F.
+
+      We set this flag here, before actually applying any rows, in
+      case the SQL thread is stopped and we need to detect that we're
+      inside a statement and halting abruptly might cause problems
+      when restarting.
+     */
+    const_cast<Relay_log_info*>(rli)->set_flag(Relay_log_info::IN_STMT);
+
+     if ( m_width == table->s->fields && bitmap_is_set_all(&m_cols))
+      set_flags(COMPLETE_ROWS_F);
+
+    /* 
+      Set tables write and read sets.
+      
+      Read_set contains all slave columns (in case we are going to fetch
+      a complete record from slave)
+      
+      Write_set equals the m_cols bitmap sent from master but it can be 
+      longer if slave has extra columns. 
+     */ 
+
+    DBUG_PRINT_BITSET("debug", "Setting table's write_set from: %s", &m_cols);
+    
+    bitmap_set_all(table->read_set);
+    bitmap_set_all(table->write_set);
+    if (!get_flags(COMPLETE_ROWS_F))
+      bitmap_intersect(table->write_set,&m_cols);
+
+    // Do event specific preparations 
+    
+    error= do_before_row_operations(rli);
+
+    // row processing loop
+
+    while (error == 0 && m_curr_row < m_rows_end)
+    {
+      /* in_use can have been set to NULL in close_tables_for_reopen */
+      THD* old_thd= table->in_use;
+      if (!table->in_use)
+        table->in_use= thd;
+
+      error= do_exec_row(rli);
+
+      table->in_use = old_thd;
+      switch (error)
+      {
+      case 0:
+	break;
+
+      /* Some recoverable errors */
+      case HA_ERR_RECORD_CHANGED:
+      case HA_ERR_KEY_NOT_FOUND:	/* Idempotency support: OK if
+                                           tuple does not exist */
+        error= 0;
+        break;
+
+      default:
+	rli->report(ERROR_LEVEL, thd->net.last_errno,
+                    "Error in %s event: row application failed. %s",
+                    get_type_str(),
+                    thd->net.last_error ? thd->net.last_error : "");
+	thd->query_error= 1;
+	break;
+      }
+
+      /*
+       If m_curr_row_end  was not set during event execution (e.g., because
+       of errors) we can't proceed to the next row. If the error is transient
+       (i.e., error==0 at this point) we must call unpack_current_row() to set 
+       m_curr_row_end.
+      */ 
+   
+      DBUG_PRINT("info", ("error: %d", error));
+      DBUG_PRINT("info", ("curr_row: 0x%lu; curr_row_end: 0x%lu; rows_end: 0x%lu",
+                          (ulong) m_curr_row, (ulong) m_curr_row_end, (ulong) m_rows_end));
+
+      if (!m_curr_row_end && !error)
+        unpack_current_row(rli);
+  
+      // at this moment m_curr_row_end should be set
+      DBUG_ASSERT(error || m_curr_row_end != NULL); 
+      DBUG_ASSERT(error || m_curr_row < m_curr_row_end);
+      DBUG_ASSERT(error || m_curr_row_end <= m_rows_end);
+  
+      m_curr_row= m_curr_row_end;
+ 
+    } // row processing loop
+
+    DBUG_EXECUTE_IF("STOP_SLAVE_after_first_Rows_event",
+                    const_cast<Relay_log_info*>(rli)->abort_slave= 1;);
+    error= do_after_row_operations(rli, error);
+    if (!cache_stmt)
+    {
+      DBUG_PRINT("info", ("Marked that we need to keep log"));
+      thd->options|= OPTION_KEEP_LOG;
+    }
+  } // if (table)
+
+  /*
+    We need to delay this clear until here bacause unpack_current_row() uses
+    master-side table definitions stored in rli.
+  */
+  if (rli->tables_to_lock && get_flags(STMT_END_F))
+    const_cast<Relay_log_info*>(rli)->clear_tables_to_lock();
+
+  if (error)
+  {                     /* error has occured during the transaction */
+    rli->report(ERROR_LEVEL, thd->net.last_errno,
+                "Error in %s event: error during transaction execution "
+                "on table %s.%s. %s",
+                get_type_str(), table->s->db.str,
+                table->s->table_name.str,
+                thd->net.last_error ? thd->net.last_error : "");
+
+    /*
+      If one day we honour --skip-slave-errors in row-based replication, and
+      the error should be skipped, then we would clear mappings, rollback,
+      close tables, but the slave SQL thread would not stop and then may
+      assume the mapping is still available, the tables are still open...
+      So then we should clear mappings/rollback/close here only if this is a
+      STMT_END_F.
+      For now we code, knowing that error is not skippable and so slave SQL
+      thread is certainly going to stop.
+      rollback at the caller along with sbr.
+    */
+    thd->reset_current_stmt_binlog_row_based();
+    const_cast<Relay_log_info*>(rli)->cleanup_context(thd, error);
+    thd->query_error= 1;
+    DBUG_RETURN(error);
+  }
+
+  /*
+    This code would ideally be placed in do_update_pos() instead, but
+    since we have no access to table there, we do the setting of
+    last_event_start_time here instead.
+  */
+  if (table && (table->s->primary_key == MAX_KEY) &&
+      !cache_stmt && get_flags(STMT_END_F) == RLE_NO_FLAGS)
+  {
+    /*
+      ------------ Temporary fix until WL#2975 is implemented ---------
+
+      This event is not the last one (no STMT_END_F). If we stop now
+      (in case of terminate_slave_thread()), how will we restart? We
+      have to restart from Table_map_log_event, but as this table is
+      not transactional, the rows already inserted will still be
+      present, and idempotency is not guaranteed (no PK) so we risk
+      that repeating leads to double insert. So we desperately try to
+      continue, hope we'll eventually leave this buggy situation (by
+      executing the final Old_rows_log_event). If we are in a hopeless
+      wait (reached end of last relay log and nothing gets appended
+      there), we timeout after one minute, and notify DBA about the
+      problem.  When WL#2975 is implemented, just remove the member
+      Relay_log_info::last_event_start_time and all its occurrences.
+    */
+    const_cast<Relay_log_info*>(rli)->last_event_start_time= my_time(0);
+  }
+
+  DBUG_RETURN(0);
+}
+
+
+Log_event::enum_skip_reason
+Old_rows_log_event::do_shall_skip(Relay_log_info *rli)
+{
+  /*
+    If the slave skip counter is 1 and this event does not end a
+    statement, then we should not start executing on the next event.
+    Otherwise, we defer the decision to the normal skipping logic.
+  */
+  if (rli->slave_skip_counter == 1 && !get_flags(STMT_END_F))
+    return Log_event::EVENT_SKIP_IGNORE;
+  else
+    return Log_event::do_shall_skip(rli);
+}
+
+int
+Old_rows_log_event::do_update_pos(Relay_log_info *rli)
+{
+  DBUG_ENTER("Old_rows_log_event::do_update_pos");
+  int error= 0;
+
+  DBUG_PRINT("info", ("flags: %s",
+                      get_flags(STMT_END_F) ? "STMT_END_F " : ""));
+
+  if (get_flags(STMT_END_F))
+  {
+    /*
+      This is the end of a statement or transaction, so close (and
+      unlock) the tables we opened when processing the
+      Table_map_log_event starting the statement.
+
+      OBSERVER.  This will clear *all* mappings, not only those that
+      are open for the table. There is not good handle for on-close
+      actions for tables.
+
+      NOTE. Even if we have no table ('table' == 0) we still need to be
+      here, so that we increase the group relay log position. If we didn't, we
+      could have a group relay log position which lags behind "forever"
+      (assume the last master's transaction is ignored by the slave because of
+      replicate-ignore rules).
+    */
+    thd->binlog_flush_pending_rows_event(true);
+
+    /*
+      If this event is not in a transaction, the call below will, if some
+      transactional storage engines are involved, commit the statement into
+      them and flush the pending event to binlog.
+      If this event is in a transaction, the call will do nothing, but a
+      Xid_log_event will come next which will, if some transactional engines
+      are involved, commit the transaction and flush the pending event to the
+      binlog.
+    */
+    error= ha_autocommit_or_rollback(thd, 0);
+
+    /*
+      Now what if this is not a transactional engine? we still need to
+      flush the pending event to the binlog; we did it with
+      thd->binlog_flush_pending_rows_event(). Note that we imitate
+      what is done for real queries: a call to
+      ha_autocommit_or_rollback() (sometimes only if involves a
+      transactional engine), and a call to be sure to have the pending
+      event flushed.
+    */
+
+    thd->reset_current_stmt_binlog_row_based();
+    rli->cleanup_context(thd, 0);
+    if (error == 0)
+    {
+      /*
+        Indicate that a statement is finished.
+        Step the group log position if we are not in a transaction,
+        otherwise increase the event log position.
+       */
+      rli->stmt_done(log_pos, when);
+
+      /*
+        Clear any errors pushed in thd->net.last_err* if for example "no key
+        found" (as this is allowed). This is a safety measure; apparently
+        those errors (e.g. when executing a Delete_rows_log_event_old of a
+        non-existing row, like in rpl_row_mystery22.test,
+        thd->net.last_error = "Can't find record in 't1'" and last_errno=1032)
+        do not become visible. We still prefer to wipe them out.
+      */
+      thd->clear_error();
+    }
+    else
+      rli->report(ERROR_LEVEL, error,
+                  "Error in %s event: commit of row events failed, "
+                  "table `%s`.`%s`",
+                  get_type_str(), m_table->s->db.str,
+                  m_table->s->table_name.str);
+  }
+  else
+  {
+    rli->inc_event_relay_log_pos();
+  }
+
+  DBUG_RETURN(error);
+}
+
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+
+
+#ifndef MYSQL_CLIENT
+bool Old_rows_log_event::write_data_header(IO_CACHE *file)
+{
+  uchar buf[ROWS_HEADER_LEN];	// No need to init the buffer
+
+  // This method should not be reached.
+  assert(0);
+
+  DBUG_ASSERT(m_table_id != ~0UL);
+  DBUG_EXECUTE_IF("old_row_based_repl_4_byte_map_id_master",
+                  {
+                    int4store(buf + 0, m_table_id);
+                    int2store(buf + 4, m_flags);
+                    return (my_b_safe_write(file, buf, 6));
+                  });
+  int6store(buf + RW_MAPID_OFFSET, (ulonglong)m_table_id);
+  int2store(buf + RW_FLAGS_OFFSET, m_flags);
+  return (my_b_safe_write(file, buf, ROWS_HEADER_LEN));
+}
+
+
+bool Old_rows_log_event::write_data_body(IO_CACHE*file)
+{
+  /*
+     Note that this should be the number of *bits*, not the number of
+     bytes.
+  */
+  uchar sbuf[sizeof(m_width)];
+  my_ptrdiff_t const data_size= m_rows_cur - m_rows_buf;
+
+  // This method should not be reached.
+  assert(0);
+
+  bool res= false;
+  uchar *const sbuf_end= net_store_length(sbuf, (size_t) m_width);
+  DBUG_ASSERT(static_cast<size_t>(sbuf_end - sbuf) <= sizeof(sbuf));
+
+  DBUG_DUMP("m_width", sbuf, (size_t) (sbuf_end - sbuf));
+  res= res || my_b_safe_write(file, sbuf, (size_t) (sbuf_end - sbuf));
+
+  DBUG_DUMP("m_cols", (uchar*) m_cols.bitmap, no_bytes_in_map(&m_cols));
+  res= res || my_b_safe_write(file, (uchar*) m_cols.bitmap,
+                              no_bytes_in_map(&m_cols));
+  /*
+    TODO[refactor write]: Remove the "down cast" here (and elsewhere).
+   */
+  if (get_type_code() == PRE_GA_UPDATE_ROWS_EVENT)
+  {
+    DBUG_DUMP("m_cols_ai", (uchar*) m_cols_ai.bitmap,
+              no_bytes_in_map(&m_cols_ai));
+    res= res || my_b_safe_write(file, (uchar*) m_cols_ai.bitmap,
+                                no_bytes_in_map(&m_cols_ai));
+  }
+  DBUG_DUMP("rows", m_rows_buf, data_size);
+  res= res || my_b_safe_write(file, m_rows_buf, (size_t) data_size);
+
+  return res;
+
+}
+#endif
+
+
+#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
+void Old_rows_log_event::pack_info(Protocol *protocol)
+{
+  char buf[256];
+  char const *const flagstr=
+    get_flags(STMT_END_F) ? " flags: STMT_END_F" : "";
+  size_t bytes= my_snprintf(buf, sizeof(buf),
+                               "table_id: %lu%s", m_table_id, flagstr);
+  protocol->store(buf, bytes, &my_charset_bin);
+}
+#endif
+
+
+#ifdef MYSQL_CLIENT
+void Old_rows_log_event::print_helper(FILE *file,
+                                      PRINT_EVENT_INFO *print_event_info,
+                                      char const *const name)
+{
+  IO_CACHE *const head= &print_event_info->head_cache;
+  IO_CACHE *const body= &print_event_info->body_cache;
+  if (!print_event_info->short_form)
+  {
+    bool const last_stmt_event= get_flags(STMT_END_F);
+    print_header(head, print_event_info, !last_stmt_event);
+    my_b_printf(head, "\t%s: table id %lu%s\n",
+                name, m_table_id,
+                last_stmt_event ? " flags: STMT_END_F" : "");
+    print_base64(body, print_event_info, !last_stmt_event);
+  }
+
+  if (get_flags(STMT_END_F))
+  {
+    copy_event_cache_to_file_and_reinit(head, file);
+    copy_event_cache_to_file_and_reinit(body, file);
+  }
+}
+#endif
+
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+/**
+  Write the current row into event's table.
+
+  The row is located in the row buffer, pointed by @c m_curr_row member.
+  Number of columns of the row is stored in @c m_width member (it can be 
+  different from the number of columns in the table to which we insert). 
+  Bitmap @c m_cols indicates which columns are present in the row. It is assumed 
+  that event's table is already open and pointed by @c m_table.
+
+  If the same record already exists in the table it can be either overwritten 
+  or an error is reported depending on the value of @c overwrite flag 
+  (error reporting not yet implemented). Note that the matching record can be
+  different from the row we insert if we use primary keys to identify records in
+  the table.
+
+  The row to be inserted can contain values only for selected columns. The 
+  missing columns are filled with default values using @c prepare_record() 
+  function. If a matching record is found in the table and @c overwritte is
+  true, the missing columns are taken from it.
+
+  @param  rli   Relay log info (needed for row unpacking).
+  @param  overwrite  
+                Shall we overwrite if the row already exists or signal 
+                error (currently ignored).
+
+  @returns Error code on failure, 0 on success.
+
+  This method, if successful, sets @c m_curr_row_end pointer to point at the
+  next row in the rows buffer. This is done when unpacking the row to be 
+  inserted.
+
+  @note If a matching record is found, it is either updated using 
+  @c ha_update_row() or first deleted and then new record written.
+*/ 
+
+int
+Old_rows_log_event::write_row(const Relay_log_info *const rli,
+                              const bool overwrite)
+{
+  DBUG_ENTER("write_row");
+  DBUG_ASSERT(m_table != NULL && thd != NULL);
+
+  TABLE *table= m_table;  // pointer to event's table
+  int error;
+  int keynum;
+  auto_afree_ptr<char> key(NULL);
+
+  /* fill table->record[0] with default values */
+
+  if ((error= prepare_record(rli, table, m_width,
+                             TRUE /* check if columns have def. values */)))
+    DBUG_RETURN(error);
+  
+  /* unpack row into table->record[0] */
+  error= unpack_current_row(rli); // TODO: how to handle errors?
+
+#ifndef DBUG_OFF
+  DBUG_DUMP("record[0]", table->record[0], table->s->reclength);
+  DBUG_PRINT_BITSET("debug", "write_set = %s", table->write_set);
+  DBUG_PRINT_BITSET("debug", "read_set = %s", table->read_set);
+#endif
+
+  /* 
+    Try to write record. If a corresponding record already exists in the table,
+    we try to change it using ha_update_row() if possible. Otherwise we delete
+    it and repeat the whole process again. 
+
+    TODO: Add safety measures against infinite looping. 
+   */
+
+  while ((error= table->file->ha_write_row(table->record[0])))
+  {
+    if (error == HA_ERR_LOCK_DEADLOCK || error == HA_ERR_LOCK_WAIT_TIMEOUT)
+    {
+      table->file->print_error(error, MYF(0)); /* to check at exec_relay_log_event */
+      DBUG_RETURN(error);
+    }
+    if ((keynum= table->file->get_dup_key(error)) < 0)
+    {
+      DBUG_PRINT("info",("Can't locate duplicate key (get_dup_key returns %d)",keynum));
+      table->file->print_error(error, MYF(0));
+      /*
+        We failed to retrieve the duplicate key
+        - either because the error was not "duplicate key" error
+        - or because the information which key is not available
+      */
+      DBUG_RETURN(error);
+    }
+
+    /*
+       We need to retrieve the old row into record[1] to be able to
+       either update or delete the offending record.  We either:
+
+       - use rnd_pos() with a row-id (available as dupp_row) to the
+         offending row, if that is possible (MyISAM and Blackhole), or else
+
+       - use index_read_idx() with the key that is duplicated, to
+         retrieve the offending row.
+     */
+    if (table->file->ha_table_flags() & HA_DUPLICATE_POS)
+    {
+      DBUG_PRINT("info",("Locating offending record using rnd_pos()"));
+      error= table->file->rnd_pos(table->record[1], table->file->dup_ref);
+      if (error)
+      {
+        DBUG_PRINT("info",("rnd_pos() returns error %d",error));
+        table->file->print_error(error, MYF(0));
+        DBUG_RETURN(error);
+      }
+    }
+    else
+    {
+      DBUG_PRINT("info",("Locating offending record using index_read_idx()"));
+
+      if (table->file->extra(HA_EXTRA_FLUSH_CACHE))
+      {
+        DBUG_PRINT("info",("Error when setting HA_EXTRA_FLUSH_CACHE"));
+        DBUG_RETURN(my_errno);
+      }
+
+      if (key.get() == NULL)
+      {
+        key.assign(static_cast<char*>(my_alloca(table->s->max_unique_length)));
+        if (key.get() == NULL)
+        {
+          DBUG_PRINT("info",("Can't allocate key buffer"));
+          DBUG_RETURN(ENOMEM);
+        }
+      }
+
+      key_copy((uchar*)key.get(), table->record[0], table->key_info + keynum,
+               0);
+      error= table->file->index_read_idx_map(table->record[1], keynum,
+                                             (const uchar*)key.get(),
+                                             HA_WHOLE_KEY,
+                                             HA_READ_KEY_EXACT);
+      if (error)
+      {
+        DBUG_PRINT("info",("index_read_idx() returns error %d",error)); 
+        table->file->print_error(error, MYF(0));
+        DBUG_RETURN(error);
+      }
+    }
+
+    /*
+       Now, record[1] should contain the offending row.  That
+       will enable us to update it or, alternatively, delete it (so
+       that we can insert the new row afterwards).
+     */
+
+    /*
+      If row is incomplete we will use the record found to fill 
+      missing columns.  
+    */
+    if (!get_flags(COMPLETE_ROWS_F))
+    {
+      restore_record(table,record[1]);
+      error= unpack_current_row(rli);
+    }
+
+#ifndef DBUG_OFF
+    DBUG_PRINT("debug",("preparing for update: before and after image"));
+    DBUG_DUMP("record[1] (before)", table->record[1], table->s->reclength);
+    DBUG_DUMP("record[0] (after)", table->record[0], table->s->reclength);
+#endif
+
+    /*
+       REPLACE is defined as either INSERT or DELETE + INSERT.  If
+       possible, we can replace it with an UPDATE, but that will not
+       work on InnoDB if FOREIGN KEY checks are necessary.
+
+       I (Matz) am not sure of the reason for the last_uniq_key()
+       check as, but I'm guessing that it's something along the
+       following lines.
+
+       Suppose that we got the duplicate key to be a key that is not
+       the last unique key for the table and we perform an update:
+       then there might be another key for which the unique check will
+       fail, so we're better off just deleting the row and inserting
+       the correct row.
+     */
+    if (last_uniq_key(table, keynum) &&
+        !table->file->referenced_by_foreign_key())
+    {
+      DBUG_PRINT("info",("Updating row using ha_update_row()"));
+      error=table->file->ha_update_row(table->record[1],
+                                       table->record[0]);
+      switch (error) {
+                
+      case HA_ERR_RECORD_IS_THE_SAME:
+        DBUG_PRINT("info",("ignoring HA_ERR_RECORD_IS_THE_SAME error from"
+                           " ha_update_row()"));
+        error= 0;
+      
+      case 0:
+        break;
+        
+      default:    
+        DBUG_PRINT("info",("ha_update_row() returns error %d",error));
+        table->file->print_error(error, MYF(0));
+      }
+      
+      DBUG_RETURN(error);
+    }
+    else
+    {
+      DBUG_PRINT("info",("Deleting offending row and trying to write new one again"));
+      if ((error= table->file->ha_delete_row(table->record[1])))
+      {
+        DBUG_PRINT("info",("ha_delete_row() returns error %d",error));
+        table->file->print_error(error, MYF(0));
+        DBUG_RETURN(error);
+      }
+      /* Will retry ha_write_row() with the offending row removed. */
+    }
+  }
+
+  DBUG_RETURN(error);
+}
+
+
+/**
+  Locate the current row in event's table.
+
+  The current row is pointed by @c m_curr_row. Member @c m_width tells how many 
+  columns are there in the row (this can be differnet from the number of columns 
+  in the table). It is assumed that event's table is already open and pointed 
+  by @c m_table.
+
+  If a corresponding record is found in the table it is stored in 
+  @c m_table->record[0]. Note that when record is located based on a primary 
+  key, it is possible that the record found differs from the row being located.
+
+  If no key is specified or table does not have keys, a table scan is used to 
+  find the row. In that case the row should be complete and contain values for
+  all columns. However, it can still be shorter than the table, i.e. the table 
+  can contain extra columns not present in the row. It is also possible that 
+  the table has fewer columns than the row being located. 
+
+  @returns Error code on failure, 0 on success. 
+  
+  @post In case of success @c m_table->record[0] contains the record found. 
+  Also, the internal "cursor" of the table is positioned at the record found.
+
+  @note If the engine allows random access of the records, a combination of
+  @c position() and @c rnd_pos() will be used. 
+ */
+
+int Old_rows_log_event::find_row(const Relay_log_info *rli)
+{
+  DBUG_ENTER("find_row");
+
+  DBUG_ASSERT(m_table && m_table->in_use != NULL);
+
+  TABLE *table= m_table;
+  int error;
+
+  /* unpack row - missing fields get default values */
+
+  // TODO: shall we check and report errors here?
+  prepare_record(NULL,table,m_width,FALSE /* don't check errors */); 
+  error= unpack_current_row(rli); 
+
+#ifndef DBUG_OFF
+  DBUG_PRINT("info",("looking for the following record"));
+  DBUG_DUMP("record[0]", table->record[0], table->s->reclength);
+#endif
+
+  if ((table->file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_POSITION) &&
+      table->s->primary_key < MAX_KEY)
+  {
+    /*
+      Use a more efficient method to fetch the record given by
+      table->record[0] if the engine allows it.  We first compute a
+      row reference using the position() member function (it will be
+      stored in table->file->ref) and the use rnd_pos() to position
+      the "cursor" (i.e., record[0] in this case) at the correct row.
+
+      TODO: Add a check that the correct record has been fetched by
+      comparing with the original record. Take into account that the
+      record on the master and slave can be of different
+      length. Something along these lines should work:
+
+      ADD>>>  store_record(table,record[1]);
+              int error= table->file->rnd_pos(table->record[0], table->file->ref);
+      ADD>>>  DBUG_ASSERT(memcmp(table->record[1], table->record[0],
+                                 table->s->reclength) == 0);
+
+    */
+    DBUG_PRINT("info",("locating record using primary key (position)"));
+    int error= table->file->rnd_pos_by_record(table->record[0]);
+    if (error)
+    {
+      DBUG_PRINT("info",("rnd_pos returns error %d",error));
+      table->file->print_error(error, MYF(0));
+    }
+    DBUG_RETURN(error);
+  }
+
+  // We can't use position() - try other methods.
+  
+  /* 
+    We need to retrieve all fields
+    TODO: Move this out from this function to main loop 
+   */
+  table->use_all_columns();
+
+  /*
+    Save copy of the record in table->record[1]. It might be needed 
+    later if linear search is used to find exact match.
+   */ 
+  store_record(table,record[1]);    
+
+  if (table->s->keys > 0)
+  {
+    DBUG_PRINT("info",("locating record using primary key (index_read)"));
+
+    /* We have a key: search the table using the index */
+    if (!table->file->inited && (error= table->file->ha_index_init(0, FALSE)))
+    {
+      DBUG_PRINT("info",("ha_index_init returns error %d",error));
+      table->file->print_error(error, MYF(0));
+      DBUG_RETURN(error);
+    }
+
+    /* Fill key data for the row */
+
+    DBUG_ASSERT(m_key);
+    key_copy(m_key, table->record[0], table->key_info, 0);
+
+    /*
+      Don't print debug messages when running valgrind since they can
+      trigger false warnings.
+     */
+#ifndef HAVE_purify
+    DBUG_DUMP("key data", m_key, table->key_info->key_length);
+#endif
+
+    /*
+      We need to set the null bytes to ensure that the filler bit are
+      all set when returning.  There are storage engines that just set
+      the necessary bits on the bytes and don't set the filler bits
+      correctly.
+    */
+    my_ptrdiff_t const pos=
+      table->s->null_bytes > 0 ? table->s->null_bytes - 1 : 0;
+    table->record[0][pos]= 0xFF;
+    
+    if ((error= table->file->index_read_map(table->record[0], m_key, 
+                                            HA_WHOLE_KEY,
+                                            HA_READ_KEY_EXACT)))
+    {
+      DBUG_PRINT("info",("no record matching the key found in the table"));
+      table->file->print_error(error, MYF(0));
+      table->file->ha_index_end();
+      DBUG_RETURN(error);
+    }
+
+  /*
+    Don't print debug messages when running valgrind since they can
+    trigger false warnings.
+   */
+#ifndef HAVE_purify
+    DBUG_PRINT("info",("found first matching record")); 
+    DBUG_DUMP("record[0]", table->record[0], table->s->reclength);
+#endif
+    /*
+      Below is a minor "optimization".  If the key (i.e., key number
+      0) has the HA_NOSAME flag set, we know that we have found the
+      correct record (since there can be no duplicates); otherwise, we
+      have to compare the record with the one found to see if it is
+      the correct one.
+
+      CAVEAT! This behaviour is essential for the replication of,
+      e.g., the mysql.proc table since the correct record *shall* be
+      found using the primary key *only*.  There shall be no
+      comparison of non-PK columns to decide if the correct record is
+      found.  I can see no scenario where it would be incorrect to
+      chose the row to change only using a PK or an UNNI.
+    */
+    if (table->key_info->flags & HA_NOSAME)
+    {
+      table->file->ha_index_end();
+      DBUG_RETURN(0);
+    }
+
+    /*
+      In case key is not unique, we still have to iterate over records found
+      and find the one which is identical to the row given. A copy of the 
+      record we are looking for is stored in record[1].
+     */ 
+    DBUG_PRINT("info",("non-unique index, scanning it to find matching record")); 
+
+    while (record_compare(table))
+    {
+      /*
+        We need to set the null bytes to ensure that the filler bit
+        are all set when returning.  There are storage engines that
+        just set the necessary bits on the bytes and don't set the
+        filler bits correctly.
+
+        TODO[record format ndb]: Remove this code once NDB returns the
+        correct record format.
+      */
+      if (table->s->null_bytes > 0)
+      {
+        table->record[0][table->s->null_bytes - 1]|=
+          256U - (1U << table->s->last_null_bit_pos);
+      }
+
+      if ((error= table->file->index_next(table->record[0])))
+      {
+        DBUG_PRINT("info",("no record matching the given row found"));
+        table->file->print_error(error, MYF(0));
+        table->file->ha_index_end();
+        DBUG_RETURN(error);
+      }
+    }
+
+    /*
+      Have to restart the scan to be able to fetch the next row.
+    */
+    table->file->ha_index_end();
+  }
+  else
+  {
+    DBUG_PRINT("info",("locating record using table scan (rnd_next)"));
+
+    int restart_count= 0; // Number of times scanning has restarted from top
+
+    /* We don't have a key: search the table using rnd_next() */
+    if ((error= table->file->ha_rnd_init(1)))
+    {
+      DBUG_PRINT("info",("error initializing table scan"
+                         " (ha_rnd_init returns %d)",error));
+      table->file->print_error(error, MYF(0));
+      DBUG_RETURN(error);
+    }
+
+    /* Continue until we find the right record or have made a full loop */
+    do
+    {
+      error= table->file->rnd_next(table->record[0]);
+
+      switch (error) {
+
+      case 0:
+      case HA_ERR_RECORD_DELETED:
+        break;
+
+      case HA_ERR_END_OF_FILE:
+        if (++restart_count < 2)
+          table->file->ha_rnd_init(1);
+        break;
+
+      default:
+        DBUG_PRINT("info", ("Failed to get next record"
+                            " (rnd_next returns %d)",error));
+        table->file->print_error(error, MYF(0));
+        table->file->ha_rnd_end();
+        DBUG_RETURN(error);
+      }
+    }
+    while (restart_count < 2 && record_compare(table));
+    
+    /* 
+      Note: above record_compare will take into accout all record fields 
+      which might be incorrect in case a partial row was given in the event
+     */
+
+    /*
+      Have to restart the scan to be able to fetch the next row.
+    */
+    if (restart_count == 2)
+      DBUG_PRINT("info", ("Record not found"));
+    else
+      DBUG_DUMP("record found", table->record[0], table->s->reclength);
+    table->file->ha_rnd_end();
+
+    DBUG_ASSERT(error == HA_ERR_END_OF_FILE || error == 0);
+    DBUG_RETURN(error);
+  }
+
+  DBUG_RETURN(0);
+}
+
+#endif
+
+
+/**************************************************************************
+	Write_rows_log_event member functions
+**************************************************************************/
+
+/*
+  Constructor used to build an event for writing to the binary log.
+ */
+#if !defined(MYSQL_CLIENT)
+Write_rows_log_event_old::Write_rows_log_event_old(THD *thd_arg,
+                                                   TABLE *tbl_arg,
+                                                   ulong tid_arg,
+                                                   MY_BITMAP const *cols,
+                                                   bool is_transactional)
+  : Old_rows_log_event(thd_arg, tbl_arg, tid_arg, cols, is_transactional)
+{
+
+  // This constructor should not be reached.
+  assert(0);
+
+}
+#endif
+
+
+/*
+  Constructor used by slave to read the event from the binary log.
+ */
+#ifdef HAVE_REPLICATION
+Write_rows_log_event_old::Write_rows_log_event_old(const char *buf,
+                                                   uint event_len,
+                                                   const Format_description_log_event
+                                                   *description_event)
+: Old_rows_log_event(buf, event_len, PRE_GA_WRITE_ROWS_EVENT,
+                     description_event)
+{
+}
+#endif
+
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+int 
+Write_rows_log_event_old::do_before_row_operations(const Slave_reporting_capability *const)
+{
+  int error= 0;
+
+  /*
+    We are using REPLACE semantics and not INSERT IGNORE semantics
+    when writing rows, that is: new rows replace old rows.  We need to
+    inform the storage engine that it should use this behaviour.
+  */
+
+  /* Tell the storage engine that we are using REPLACE semantics. */
+  thd->lex->duplicates= DUP_REPLACE;
+
+  /*
+    Pretend we're executing a REPLACE command: this is needed for
+    InnoDB and NDB Cluster since they are not (properly) checking the
+    lex->duplicates flag.
+  */
+  thd->lex->sql_command= SQLCOM_REPLACE;
+  /* 
+     Do not raise the error flag in case of hitting to an unique attribute
+  */
+  m_table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
+  /* 
+     NDB specific: update from ndb master wrapped as Write_rows
+  */
+  /*
+    so that the event should be applied to replace slave's row
+  */
+  m_table->file->extra(HA_EXTRA_WRITE_CAN_REPLACE);
+  /* 
+     NDB specific: if update from ndb master wrapped as Write_rows
+     does not find the row it's assumed idempotent binlog applying
+     is taking place; don't raise the error.
+  */
+  m_table->file->extra(HA_EXTRA_IGNORE_NO_KEY);
+  /*
+    TODO: the cluster team (Tomas?) says that it's better if the engine knows
+    how many rows are going to be inserted, then it can allocate needed memory
+    from the start.
+  */
+  m_table->file->ha_start_bulk_insert(0);
+  /*
+    We need TIMESTAMP_NO_AUTO_SET otherwise ha_write_row() will not use fill
+    any TIMESTAMP column with data from the row but instead will use
+    the event's current time.
+    As we replicate from TIMESTAMP to TIMESTAMP and slave has no extra
+    columns, we know that all TIMESTAMP columns on slave will receive explicit
+    data from the row, so TIMESTAMP_NO_AUTO_SET is ok.
+    When we allow a table without TIMESTAMP to be replicated to a table having
+    more columns including a TIMESTAMP column, or when we allow a TIMESTAMP
+    column to be replicated into a BIGINT column and the slave's table has a
+    TIMESTAMP column, then the slave's TIMESTAMP column will take its value
+    from set_time() which we called earlier (consistent with SBR). And then in
+    some cases we won't want TIMESTAMP_NO_AUTO_SET (will require some code to
+    analyze if explicit data is provided for slave's TIMESTAMP columns).
+  */
+  m_table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;
+  return error;
+}
+
+
+int 
+Write_rows_log_event_old::do_after_row_operations(const Slave_reporting_capability *const,
+                                                  int error)
+{
+  int local_error= 0;
+  m_table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
+  m_table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE);
+  /*
+    reseting the extra with 
+    table->file->extra(HA_EXTRA_NO_IGNORE_NO_KEY); 
+    fires bug#27077
+    todo: explain or fix
+  */
+  if ((local_error= m_table->file->ha_end_bulk_insert()))
+  {
+    m_table->file->print_error(local_error, MYF(0));
+  }
+  return error? error : local_error;
+}
+
+
+int 
+Write_rows_log_event_old::do_exec_row(const Relay_log_info *const rli)
+{
+  DBUG_ASSERT(m_table != NULL);
+  int error= write_row(rli, TRUE /* overwrite */);
+  
+  if (error && !thd->net.last_errno)
+    thd->net.last_errno= error;
+      
+  return error; 
+}
+
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+
+
+#ifdef MYSQL_CLIENT
+void Write_rows_log_event_old::print(FILE *file,
+                                     PRINT_EVENT_INFO* print_event_info)
+{
+  Old_rows_log_event::print_helper(file, print_event_info, "Write_rows_old");
+}
+#endif
+
+
+/**************************************************************************
+	Delete_rows_log_event member functions
+**************************************************************************/
+
+/*
+  Constructor used to build an event for writing to the binary log.
+ */
+
+#ifndef MYSQL_CLIENT
+Delete_rows_log_event_old::Delete_rows_log_event_old(THD *thd_arg,
+                                                     TABLE *tbl_arg,
+                                                     ulong tid,
+                                                     MY_BITMAP const *cols,
+                                                     bool is_transactional)
+  : Old_rows_log_event(thd_arg, tbl_arg, tid, cols, is_transactional),
+    m_after_image(NULL), m_memory(NULL)
+{
+
+  // This constructor should not be reached.
+  assert(0);
+
+}
+#endif /* #if !defined(MYSQL_CLIENT) */
+
+
+/*
+  Constructor used by slave to read the event from the binary log.
+ */
+#ifdef HAVE_REPLICATION
+Delete_rows_log_event_old::Delete_rows_log_event_old(const char *buf,
+                                                     uint event_len,
+                                                     const Format_description_log_event
+                                                     *description_event)
+  : Old_rows_log_event(buf, event_len, PRE_GA_DELETE_ROWS_EVENT,
+                       description_event),
+    m_after_image(NULL), m_memory(NULL)
+{
+}
+#endif
+
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+
+int 
+Delete_rows_log_event_old::do_before_row_operations(const Slave_reporting_capability *const)
+{
+  if ((m_table->file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_POSITION) &&
+      m_table->s->primary_key < MAX_KEY)
+  {
+    /*
+      We don't need to allocate any memory for m_key since it is not used.
+    */
+    return 0;
+  }
+
+  if (m_table->s->keys > 0)
+  {
+    // Allocate buffer for key searches
+    m_key= (uchar*)my_malloc(m_table->key_info->key_length, MYF(MY_WME));
+    if (!m_key)
+      return HA_ERR_OUT_OF_MEM;
+  }
+  return 0;
+}
+
+
+int 
+Delete_rows_log_event_old::do_after_row_operations(const Slave_reporting_capability *const,
+                                                   int error)
+{
+  /*error= ToDo:find out what this should really be, this triggers close_scan in nbd, returning error?*/
+  m_table->file->ha_index_or_rnd_end();
+  my_free(m_key, MYF(MY_ALLOW_ZERO_PTR));
+  m_key= NULL;
+
+  return error;
+}
+
+
+int Delete_rows_log_event_old::do_exec_row(const Relay_log_info *const rli)
+{
+  int error;
+  DBUG_ASSERT(m_table != NULL);
+
+  if (!(error= find_row(rli))) 
+  { 
+    /*
+      Delete the record found, located in record[0]
+    */
+    error= m_table->file->ha_delete_row(m_table->record[0]);
+  }
+  return error;
+}
+
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+
+
+#ifdef MYSQL_CLIENT
+void Delete_rows_log_event_old::print(FILE *file,
+                                      PRINT_EVENT_INFO* print_event_info)
+{
+  Old_rows_log_event::print_helper(file, print_event_info, "Delete_rows_old");
+}
+#endif
+
+
+/**************************************************************************
+	Update_rows_log_event member functions
+**************************************************************************/
+
+/*
+  Constructor used to build an event for writing to the binary log.
+ */
+#if !defined(MYSQL_CLIENT)
+Update_rows_log_event_old::Update_rows_log_event_old(THD *thd_arg,
+                                                     TABLE *tbl_arg,
+                                                     ulong tid,
+                                                     MY_BITMAP const *cols,
+                                                     bool is_transactional)
+  : Old_rows_log_event(thd_arg, tbl_arg, tid, cols, is_transactional),
+    m_after_image(NULL), m_memory(NULL)
+{
+
+  // This constructor should not be reached.
+  assert(0);
+
+  init(cols);
+}
+
+
+void Update_rows_log_event_old::init(MY_BITMAP const *cols)
+{
+  /* if bitmap_init fails, caught in is_valid() */
+  if (likely(!bitmap_init(&m_cols_ai,
+                          m_width <= sizeof(m_bitbuf_ai)*8 ? m_bitbuf_ai : NULL,
+                          m_width,
+                          false)))
+  {
+    /* Cols can be zero if this is a dummy binrows event */
+    if (likely(cols != NULL))
+    {
+      memcpy(m_cols_ai.bitmap, cols->bitmap, no_bytes_in_map(cols));
+      create_last_word_mask(&m_cols_ai);
+    }
+  }
+}
+#endif /* !defined(MYSQL_CLIENT) */
+
+
+Update_rows_log_event_old::~Update_rows_log_event_old()
+{
+  if (m_cols_ai.bitmap == m_bitbuf_ai) // no my_malloc happened
+    m_cols_ai.bitmap= 0; // so no my_free in bitmap_free
+  bitmap_free(&m_cols_ai); // To pair with bitmap_init().
+}
+
+
+/*
+  Constructor used by slave to read the event from the binary log.
+ */
+#ifdef HAVE_REPLICATION
+Update_rows_log_event_old::Update_rows_log_event_old(const char *buf,
+                                                     uint event_len,
+                                                     const
+                                                     Format_description_log_event
+                                                     *description_event)
+  : Old_rows_log_event(buf, event_len, PRE_GA_UPDATE_ROWS_EVENT,
+                       description_event),
+    m_after_image(NULL), m_memory(NULL)
+{
+}
+#endif
+
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+
+int 
+Update_rows_log_event_old::do_before_row_operations(const Slave_reporting_capability *const)
+{
+  if (m_table->s->keys > 0)
+  {
+    // Allocate buffer for key searches
+    m_key= (uchar*)my_malloc(m_table->key_info->key_length, MYF(MY_WME));
+    if (!m_key)
+      return HA_ERR_OUT_OF_MEM;
+  }
+
+  m_table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;
+
+  return 0;
+}
+
+
+int 
+Update_rows_log_event_old::do_after_row_operations(const Slave_reporting_capability *const,
+                                                   int error)
+{
+  /*error= ToDo:find out what this should really be, this triggers close_scan in nbd, returning error?*/
+  m_table->file->ha_index_or_rnd_end();
+  my_free(m_key, MYF(MY_ALLOW_ZERO_PTR)); // Free for multi_malloc
+  m_key= NULL;
+
+  return error;
+}
+
+
+int 
+Update_rows_log_event_old::do_exec_row(const Relay_log_info *const rli)
+{
+  DBUG_ASSERT(m_table != NULL);
+
+  int error= find_row(rli); 
+  if (error)
+  {
+    /*
+      We need to read the second image in the event of error to be
+      able to skip to the next pair of updates
+    */
+    m_curr_row= m_curr_row_end;
+    unpack_current_row(rli);
+    return error;
+  }
+
+  /*
+    This is the situation after locating BI:
+
+    ===|=== before image ====|=== after image ===|===
+       ^                     ^
+       m_curr_row            m_curr_row_end
+
+    BI found in the table is stored in record[0]. We copy it to record[1]
+    and unpack AI to record[0].
+   */
+
+  store_record(m_table,record[1]);
+
+  m_curr_row= m_curr_row_end;
+  error= unpack_current_row(rli); // this also updates m_curr_row_end
+
+  /*
+    Now we have the right row to update.  The old row (the one we're
+    looking for) is in record[1] and the new row is in record[0].
+  */
+#ifndef HAVE_purify
+  /*
+    Don't print debug messages when running valgrind since they can
+    trigger false warnings.
+   */
+  DBUG_PRINT("info",("Updating row in table"));
+  DBUG_DUMP("old record", m_table->record[1], m_table->s->reclength);
+  DBUG_DUMP("new values", m_table->record[0], m_table->s->reclength);
+#endif
+
+  error= m_table->file->ha_update_row(m_table->record[1], m_table->record[0]);
+  if (error == HA_ERR_RECORD_IS_THE_SAME)
+    error= 0;
+
+  return error;
+}
+
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+
+
+#ifdef MYSQL_CLIENT
+void Update_rows_log_event_old::print(FILE *file,
+                                      PRINT_EVENT_INFO* print_event_info)
+{
+  Old_rows_log_event::print_helper(file, print_event_info, "Update_rows_old");
+}
+#endif
diff --git a/sql/log_event_old.h b/sql/log_event_old.h
index 81e55097905..efb2be29ee4 100644
--- a/sql/log_event_old.h
+++ b/sql/log_event_old.h
@@ -20,18 +20,269 @@
   Need to include this file at the proper position of log_event.h
  */
 
+
+/**
+  @file
+
+  @brief This file contains classes handling old formats of row-based
+  binlog events.
+*/
+/*
+  Around 2007-10-31, I made these classes completely separated from
+  the new classes (before, there was a complex class hierarchy
+  involving multiple inheritance; see BUG#31581), by simply copying
+  and pasting the entire contents of Rows_log_event into
+  Old_rows_log_event and the entire contents of
+  {Write|Update|Delete}_rows_log_event into
+  {Write|Update|Delete}_rows_log_event_old.  For clarity, I will keep
+  the comments marking which code was cut-and-pasted for some time.
+  With the classes collapsed into one, there is probably some
+  redundancy (maybe some methods can be simplified and/or removed),
+  but we keep them this way for now.  /Sven
+*/
+
+
+/**
+  @class Old_rows_log_event
   
-class Old_rows_log_event
+  Base class for the three types of row-based events
+  {Write|Update|Delete}_row_log_event_old, with event type codes
+  PRE_GA_{WRITE|UPDATE|DELETE}_ROWS_EVENT.  These events are never
+  created any more, except when reading a relay log created by an old
+  server.
+*/
+class Old_rows_log_event : public Log_event
 {
- public:
- 
-  virtual ~Old_rows_log_event() {}
+  /********** BEGIN CUT & PASTE FROM Rows_log_event **********/
+public:
+  /**
+     Enumeration of the errors that can be returned.
+   */
+  enum enum_error
+  {
+    ERR_OPEN_FAILURE = -1,               /**< Failure to open table */
+    ERR_OK = 0,                                 /**< No error */
+    ERR_TABLE_LIMIT_EXCEEDED = 1,      /**< No more room for tables */
+    ERR_OUT_OF_MEM = 2,                         /**< Out of memory */
+    ERR_BAD_TABLE_DEF = 3,     /**< Table definition does not match */
+    ERR_RBR_TO_SBR = 4  /**< daisy-chanining RBR to SBR not allowed */
+  };
+
+  /*
+    These definitions allow you to combine the flags into an
+    appropriate flag set using the normal bitwise operators.  The
+    implicit conversion from an enum-constant to an integer is
+    accepted by the compiler, which is then used to set the real set
+    of flags.
+  */
+  enum enum_flag
+  {
+    /* Last event of a statement */
+    STMT_END_F = (1U << 0),
+
+    /* Value of the OPTION_NO_FOREIGN_KEY_CHECKS flag in thd->options */
+    NO_FOREIGN_KEY_CHECKS_F = (1U << 1),
+
+    /* Value of the OPTION_RELAXED_UNIQUE_CHECKS flag in thd->options */
+    RELAXED_UNIQUE_CHECKS_F = (1U << 2),
+
+    /** 
+      Indicates that rows in this event are complete, that is contain
+      values for all columns of the table.
+     */
+    COMPLETE_ROWS_F = (1U << 3)
+  };
+
+  typedef uint16 flag_set;
+
+  /* Special constants representing sets of flags */
+  enum 
+  {
+      RLE_NO_FLAGS = 0U
+  };
+
+  virtual ~Old_rows_log_event();
+
+  void set_flags(flag_set flags_arg) { m_flags |= flags_arg; }
+  void clear_flags(flag_set flags_arg) { m_flags &= ~flags_arg; }
+  flag_set get_flags(flag_set flags_arg) const { return m_flags & flags_arg; }
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  virtual void pack_info(Protocol *protocol);
+#endif
+
+#ifdef MYSQL_CLIENT
+  /* not for direct call, each derived has its own ::print() */
+  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info)= 0;
+#endif
+
+#ifndef MYSQL_CLIENT
+  int add_row_data(uchar *data, size_t length)
+  {
+    return do_add_row_data(data,length); 
+  }
+#endif
+
+  /* Member functions to implement superclass interface */
+  virtual int get_data_size();
+
+  MY_BITMAP const *get_cols() const { return &m_cols; }
+  size_t get_width() const          { return m_width; }
+  ulong get_table_id() const        { return m_table_id; }
+
+#ifndef MYSQL_CLIENT
+  virtual bool write_data_header(IO_CACHE *file);
+  virtual bool write_data_body(IO_CACHE *file);
+  virtual const char *get_db() { return m_table->s->db.str; }
+#endif
+  /*
+    Check that malloc() succeeded in allocating memory for the rows
+    buffer and the COLS vector. Checking that an Update_rows_log_event_old
+    is valid is done in the Update_rows_log_event_old::is_valid()
+    function.
+  */
+  virtual bool is_valid() const
+  {
+    return m_rows_buf && m_cols.bitmap;
+  }
+
+  uint     m_row_count;         /* The number of rows added to the event */
+
+protected:
+  /* 
+     The constructors are protected since you're supposed to inherit
+     this class, not create instances of this class.
+  */
+#ifndef MYSQL_CLIENT
+  Old_rows_log_event(THD*, TABLE*, ulong table_id,
+                     MY_BITMAP const *cols, bool is_transactional);
+#endif
+  Old_rows_log_event(const char *row_data, uint event_len,
+                     Log_event_type event_type,
+                     const Format_description_log_event *description_event);
+
+#ifdef MYSQL_CLIENT
+  void print_helper(FILE *, PRINT_EVENT_INFO *, char const *const name);
+#endif
 
+#ifndef MYSQL_CLIENT
+  virtual int do_add_row_data(uchar *data, size_t length);
+#endif
+
+#ifndef MYSQL_CLIENT
+  TABLE *m_table;		/* The table the rows belong to */
+#endif
+  ulong       m_table_id;	/* Table ID */
+  MY_BITMAP   m_cols;		/* Bitmap denoting columns available */
+  ulong       m_width;          /* The width of the columns bitmap */
+  /*
+    Bitmap for columns available in the after image, if present. These
+    fields are only available for Update_rows events. Observe that the
+    width of both the before image COLS vector and the after image
+    COLS vector is the same: the number of columns of the table on the
+    master.
+  */
+  MY_BITMAP   m_cols_ai;
+
+  ulong       m_master_reclength; /* Length of record on master side */
+
+  /* Bit buffers in the same memory as the class */
+  uint32    m_bitbuf[128/(sizeof(uint32)*8)];
+  uint32    m_bitbuf_ai[128/(sizeof(uint32)*8)];
+
+  uchar    *m_rows_buf;		/* The rows in packed format */
+  uchar    *m_rows_cur;		/* One-after the end of the data */
+  uchar    *m_rows_end;		/* One-after the end of the allocated space */
+
+  flag_set m_flags;		/* Flags for row-level events */
+
+  /* helper functions */
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  const uchar *m_curr_row;     /* Start of the row being processed */
+  const uchar *m_curr_row_end; /* One-after the end of the current row */
+  uchar    *m_key;      /* Buffer to keep key value during searches */
+
+  int find_row(const Relay_log_info *const);
+  int write_row(const Relay_log_info *const, const bool);
+
+  // Unpack the current row into m_table->record[0]
+  int unpack_current_row(const Relay_log_info *const rli)
+  { 
+    DBUG_ASSERT(m_table);
+    ASSERT_OR_RETURN_ERROR(m_curr_row < m_rows_end, HA_ERR_CORRUPT_EVENT);
+    int const result= ::unpack_row(rli, m_table, m_width, m_curr_row, &m_cols,
+                                   &m_curr_row_end, &m_master_reclength);
+    ASSERT_OR_RETURN_ERROR(m_curr_row_end <= m_rows_end, HA_ERR_CORRUPT_EVENT);
+    return result;
+  }
+#endif
+
+private:
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  virtual int do_apply_event(Relay_log_info const *rli);
+  virtual int do_update_pos(Relay_log_info *rli);
+  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
+
+  /*
+    Primitive to prepare for a sequence of row executions.
+
+    DESCRIPTION
+
+      Before doing a sequence of do_prepare_row() and do_exec_row()
+      calls, this member function should be called to prepare for the
+      entire sequence. Typically, this member function will allocate
+      space for any buffers that are needed for the two member
+      functions mentioned above.
+
+    RETURN VALUE
+
+      The member function will return 0 if all went OK, or a non-zero
+      error code otherwise.
+  */
+  virtual 
+  int do_before_row_operations(const Slave_reporting_capability *const log) = 0;
+
+  /*
+    Primitive to clean up after a sequence of row executions.
+
+    DESCRIPTION
+    
+      After doing a sequence of do_prepare_row() and do_exec_row(),
+      this member function should be called to clean up and release
+      any allocated buffers.
+      
+      The error argument, if non-zero, indicates an error which happened during
+      row processing before this function was called. In this case, even if 
+      function is successful, it should return the error code given in the argument.
+  */
+  virtual 
+  int do_after_row_operations(const Slave_reporting_capability *const log,
+                              int error) = 0;
+
+  /*
+    Primitive to do the actual execution necessary for a row.
+
+    DESCRIPTION
+      The member function will do the actual execution needed to handle a row.
+      The row is located at m_curr_row. When the function returns, 
+      m_curr_row_end should point at the next row (one byte after the end
+      of the current row).    
+
+    RETURN VALUE
+      0 if execution succeeded, 1 if execution failed.
+      
+  */
+  virtual int do_exec_row(const Relay_log_info *const rli) = 0;
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+
+  /********** END OF CUT & PASTE FROM Rows_log_event **********/
  protected:
   
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
 
-  int do_apply_event(Rows_log_event*,const Relay_log_info*);
+  int do_apply_event(Old_rows_log_event*,const Relay_log_info*);
 
   /*
     Primitive to prepare for a sequence of row executions.
@@ -100,33 +351,61 @@ class Old_rows_log_event
 };
 
 
-class Write_rows_log_event_old 
- : public Write_rows_log_event, public Old_rows_log_event
-{
+/**
+  @class Write_rows_log_event_old
 
+  Old class for binlog events that write new rows to a table (event
+  type code PRE_GA_WRITE_ROWS_EVENT).  Such events are never produced
+  by this version of the server, but they may be read from a relay log
+  created by an old server.  New servers create events of class
+  Write_rows_log_event (event type code WRITE_ROWS_EVENT) instead.
+*/
+class Write_rows_log_event_old : public Old_rows_log_event
+{
+  /********** BEGIN CUT & PASTE FROM Write_rows_log_event **********/
 public:
-  enum
-  {
-    /* Support interface to THD::binlog_prepare_pending_rows_event */
-    TYPE_CODE = PRE_GA_WRITE_ROWS_EVENT
-  };
-
 #if !defined(MYSQL_CLIENT)
-  Write_rows_log_event_old(THD *thd, TABLE *table, ulong table_id,
-                           MY_BITMAP const *cols, bool is_transactional)
-    : Write_rows_log_event(thd, table, table_id, cols, is_transactional)
-  {
-  }
+  Write_rows_log_event_old(THD*, TABLE*, ulong table_id,
+                           MY_BITMAP const *cols, bool is_transactional);
 #endif
-#if defined(HAVE_REPLICATION)
+#ifdef HAVE_REPLICATION
   Write_rows_log_event_old(const char *buf, uint event_len,
-                           const Format_description_log_event *descr)
-    : Write_rows_log_event(buf, event_len, descr)
+                           const Format_description_log_event *description_event);
+#endif
+#if !defined(MYSQL_CLIENT) 
+  static bool binlog_row_logging_function(THD *thd, TABLE *table,
+                                          bool is_transactional,
+                                          MY_BITMAP *cols,
+                                          uint fields,
+                                          const uchar *before_record
+                                          __attribute__((unused)),
+                                          const uchar *after_record)
   {
+    return thd->binlog_write_row(table, is_transactional,
+                                 cols, fields, after_record);
   }
 #endif
 
 private:
+#ifdef MYSQL_CLIENT
+  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
+#endif
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  virtual int do_before_row_operations(const Slave_reporting_capability *const);
+  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
+  virtual int do_exec_row(const Relay_log_info *const);
+#endif
+  /********** END OF CUT & PASTE FROM Write_rows_log_event **********/
+
+public:
+  enum
+  {
+    /* Support interface to THD::binlog_prepare_pending_rows_event */
+    TYPE_CODE = PRE_GA_WRITE_ROWS_EVENT
+  };
+
+private:
   virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
 
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
@@ -145,35 +424,74 @@ private:
 };
 
 
-class Update_rows_log_event_old 
-  : public Update_rows_log_event, public Old_rows_log_event
+/**
+  @class Update_rows_log_event_old
+
+  Old class for binlog events that modify existing rows to a table
+  (event type code PRE_GA_UPDATE_ROWS_EVENT).  Such events are never
+  produced by this version of the server, but they may be read from a
+  relay log created by an old server.  New servers create events of
+  class Update_rows_log_event (event type code UPDATE_ROWS_EVENT)
+  instead.
+*/
+class Update_rows_log_event_old : public Old_rows_log_event
 {
-  uchar *m_after_image, *m_memory;
-  
+  /********** BEGIN CUT & PASTE FROM Update_rows_log_event **********/
 public:
-  enum 
-  {
-    /* Support interface to THD::binlog_prepare_pending_rows_event */
-    TYPE_CODE = PRE_GA_UPDATE_ROWS_EVENT
-  };
+#ifndef MYSQL_CLIENT
+  Update_rows_log_event_old(THD*, TABLE*, ulong table_id,
+                            MY_BITMAP const *cols,
+                            bool is_transactional);
 
-#if !defined(MYSQL_CLIENT)
-  Update_rows_log_event_old(THD *thd, TABLE *table, ulong table_id,
-                           MY_BITMAP const *cols, bool is_transactional)
-    : Update_rows_log_event(thd, table, table_id, cols, is_transactional),
-      m_after_image(NULL), m_memory(NULL)
+  void init(MY_BITMAP const *cols);
+#endif
+
+  virtual ~Update_rows_log_event_old();
+
+#ifdef HAVE_REPLICATION
+  Update_rows_log_event_old(const char *buf, uint event_len,
+                            const Format_description_log_event *description_event);
+#endif
+
+#if !defined(MYSQL_CLIENT) 
+  static bool binlog_row_logging_function(THD *thd, TABLE *table,
+                                          bool is_transactional,
+                                          MY_BITMAP *cols,
+                                          uint fields,
+                                          const uchar *before_record,
+                                          const uchar *after_record)
   {
+    return thd->binlog_update_row(table, is_transactional,
+                                  cols, fields, before_record, after_record);
   }
 #endif
-#if defined(HAVE_REPLICATION)
-  Update_rows_log_event_old(const char *buf, uint event_len, 
-                            const Format_description_log_event *descr)
-    : Update_rows_log_event(buf, event_len, descr),
-      m_after_image(NULL), m_memory(NULL)
+
+  virtual bool is_valid() const
   {
+    return Old_rows_log_event::is_valid() && m_cols_ai.bitmap;
   }
+
+protected:
+#ifdef MYSQL_CLIENT
+  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
 #endif
 
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  virtual int do_before_row_operations(const Slave_reporting_capability *const);
+  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
+  virtual int do_exec_row(const Relay_log_info *const);
+#endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
+  /********** END OF CUT & PASTE FROM Update_rows_log_event **********/
+
+  uchar *m_after_image, *m_memory;
+  
+public:
+  enum 
+  {
+    /* Support interface to THD::binlog_prepare_pending_rows_event */
+    TYPE_CODE = PRE_GA_UPDATE_ROWS_EVENT
+  };
+
 private:
   virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
 
@@ -192,9 +510,54 @@ private:
 };
 
 
-class Delete_rows_log_event_old 
-  : public Delete_rows_log_event, public Old_rows_log_event
+/**
+  @class Delete_rows_log_event_old
+
+  Old class for binlog events that delete existing rows from a table
+  (event type code PRE_GA_DELETE_ROWS_EVENT).  Such events are never
+  produced by this version of the server, but they may be read from a
+  relay log created by an old server.  New servers create events of
+  class Delete_rows_log_event (event type code DELETE_ROWS_EVENT)
+  instead.
+*/
+class Delete_rows_log_event_old : public Old_rows_log_event
 {
+  /********** BEGIN CUT & PASTE FROM Update_rows_log_event **********/
+public:
+#ifndef MYSQL_CLIENT
+  Delete_rows_log_event_old(THD*, TABLE*, ulong,
+                            MY_BITMAP const *cols, bool is_transactional);
+#endif
+#ifdef HAVE_REPLICATION
+  Delete_rows_log_event_old(const char *buf, uint event_len,
+                            const Format_description_log_event *description_event);
+#endif
+#if !defined(MYSQL_CLIENT) 
+  static bool binlog_row_logging_function(THD *thd, TABLE *table,
+                                          bool is_transactional,
+                                          MY_BITMAP *cols,
+                                          uint fields,
+                                          const uchar *before_record,
+                                          const uchar *after_record
+                                          __attribute__((unused)))
+  {
+    return thd->binlog_delete_row(table, is_transactional,
+                                  cols, fields, before_record);
+  }
+#endif
+  
+protected:
+#ifdef MYSQL_CLIENT
+  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
+#endif
+
+#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
+  virtual int do_before_row_operations(const Slave_reporting_capability *const);
+  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
+  virtual int do_exec_row(const Relay_log_info *const);
+#endif
+  /********** END CUT & PASTE FROM Delete_rows_log_event **********/
+
   uchar *m_after_image, *m_memory;
  
 public:
@@ -204,23 +567,6 @@ public:
     TYPE_CODE = PRE_GA_DELETE_ROWS_EVENT
   };
 
-#if !defined(MYSQL_CLIENT)
-  Delete_rows_log_event_old(THD *thd, TABLE *table, ulong table_id,
-                           MY_BITMAP const *cols, bool is_transactional)
-    : Delete_rows_log_event(thd, table, table_id, cols, is_transactional),
-      m_after_image(NULL), m_memory(NULL)
-  {
-  }
-#endif
-#if defined(HAVE_REPLICATION)
-  Delete_rows_log_event_old(const char *buf, uint event_len,
-                            const Format_description_log_event *descr)
-    : Delete_rows_log_event(buf, event_len, descr),
-      m_after_image(NULL), m_memory(NULL)
-  {
-  }
-#endif
-
 private:
   virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
 
@@ -240,4 +586,3 @@ private:
 
 
 #endif
-