BUG#25688 (RBR: circular replication may cause STMT_END_F flags to be

skipped):

By moving statement end actions from Rows_log_event::do_apply_event() to
Rows_log_event::do_update_pos() they will always be executed, even if
Rows_log_event::do_apply_event() is skipped because the event originated
at the same server. This because Rows_log_event::do_update_pos() is always
executed (unless Rows_log_event::do_apply_event() failed with an error,
in which case the slave stops with an error anyway). 

Adding test case.

Fixing logic to detect if inside a group. If a rotate event occured
when an initial prefix of events for a statement, but for which the
table did contain a key, last_event_start_time is set to zero, causing
rotate to end the group but without unlocking any tables. This left a
lock hanging around, which subsequently triggered an assertion when a
second attempt was made to lock the same sequence of tables.

In order to solve the above problem, a new flag was added to the relay
log info structure that is used to indicate that the replication thread
is currently executing a statement. Using this flag, the replication
thread is in a group if it is either in a statement or inside a trans-
action.

The patch also eliminates some gratuitous header file inclusions that
were not needed (and caused compile errors) and replaced them with
forward definitions.


sql/item_func.cc:
  Including definition of MASTER_INFO.
sql/log.cc:
  Including definition of RELAY_LOG_INFO since it is used in the file.
sql/log_event.cc:
  Moving statement end actions from Rows_log_event::do_apply_event() to
  Rows_log_event::do_update_pos().
  Factoring out code to update group positions and event positions into
  relay log info structure.
  ---
  Adding debugging printouts.
  Fixing logic to detect if inside a group.
sql/log_event.h:
  Adding Rows_log_event::do_update_pos().
sql/mysqld.cc:
  Including definition of MASTER_INFO.
sql/repl_failsafe.cc:
  Including definition of MASTER_INFO.
sql/rpl_mi.h:
  Including definition of RELAY_LOG_INFO since it is used in the file.
sql/rpl_rli.cc:
  Adding member function stmt_done() to do after-statement updates of the
  relay log info structure.
sql/rpl_rli.h:
  Adding member function stmt_done() to do after-statement updates of the
  relay log info structure.
sql/set_var.cc:
  Including definition of MASTER_INFO.
sql/slave.cc:
  Adding debuging printouts.
sql/slave.h:
  Removing inclusion definitions of MASTER_INFO and RELAY_LOG_INFO and
  replacing them with forward declarations since the classes are not
  used in the file. The gratuitous inclusion lead to compile errors in
  the two classes above in files that used neither.
sql/sql_binlog.cc:
  Including definition of RELAY_LOG_INFO since it is used in the file.
sql/sql_class.cc:
  Including definition of RELAY_LOG_INFO since it is used in the file.
sql/sql_class.h:
  Removing inclusion definitions of RELAY_LOG_INFO and replacing it
  with forward declaration since the class is not used in the file.
  The gratuitous inclusion lead to compile errors in the class above
  in files didn't use the class.
sql/sql_insert.cc:
  Including definition of MASTER_INFO.
sql/sql_repl.cc:
  Including definition of MASTER_INFO.
mysql-test/r/rpl_ndb_circular_simplex.result:
  New BitKeeper file ``mysql-test/r/rpl_ndb_circular_simplex.result''
mysql-test/t/rpl_ndb_circular_simplex.test:
  New BitKeeper file ``mysql-test/t/rpl_ndb_circular_simplex.test''

sql/rpl_rli.h

@@ -51,6 +51,17 @@ struct RPL_TABLE_LIST;
 
 typedef struct st_relay_log_info
 {
+  /**
+     Flags for the state of the replication.
+   */
+  enum enum_state_flag {
+    /** The replication thread is inside a statement */
+    IN_STMT,
+
+    /** Flag counter.  Should always be last */
+    STATE_FLAGS_COUNT
+  };
+
   /*
     If flag set, then rli does not store its state in any info file.
     This is the case only when we execute BINLOG SQL commands inside
@@ -314,6 +325,66 @@ typedef struct st_relay_log_info
     transaction).
    */
   time_t last_event_start_time;
+
+  /**
+    Helper function to do after statement completion.
+
+    This function is called from an event to complete the group by
+    either stepping the group position, if the "statement" is not
+    inside a transaction; or increase the event position, if the
+    "statement" is inside a transaction.
+
+    @param event_log_pos
+    Master log position of the event. The position is recorded in the
+    relay log info and used to produce information for <code>SHOW
+    SLAVE STATUS</code>.
+
+    @param event_creation_time
+    Timestamp for the creation of the event on the master side. The
+    time stamp is recorded in the relay log info and used to compute
+    the <code>Seconds_behind_master</code> field.
+  */
+  void stmt_done(my_off_t event_log_pos,
+                 time_t event_creation_time);
+
+
+  /**
+     Set the value of a replication state flag.
+
+     @param flag Flag to set
+   */
+  void set_flag(enum_state_flag flag)
+  {
+    m_flags |= (1UL << flag);
+  }
+
+  /**
+     Clear the value of a replication state flag.
+
+     @param flag Flag to clear
+   */
+  void clear_flag(enum_state_flag flag)
+  {
+    m_flags &= ~(1UL << flag);
+  }
+
+  /**
+     Is the replication inside a group?
+
+     Replication is inside a group if either:
+     - The OPTION_BEGIN flag is set, meaning we're inside a transaction
+     - The RLI_IN_STMT flag is set, meaning we're inside a statement
+
+     @retval true Replication thread is currently inside a group
+     @retval false Replication thread is currently not inside a group
+   */
+  bool is_in_group() const {
+    return (sql_thd->options & OPTION_BEGIN) ||
+      (m_flags & (1UL << IN_STMT));
+  }
+
+private:
+  uint32 m_flags;
 } RELAY_LOG_INFO;