Patch to eliminate some valgrind warnings in debug printout code.

(originally from Mats)


sql/rpl_rli.cc:
  Adding variable to mark an instance of Relay_log_info as fake.
sql/rpl_rli.h:
  Adding variable to mark an instance of Relay_log_info as fake.
sql/slave.cc:
  Not printing debug information if we are working with a fake
  instance of Relay_log_info. This because the result of calling
  update is nonsense, and trying to print it generates valgrind
  warnings.
sql/sql_binlog.cc:
  Marking newly created instance of Relay_log_info as a fake instance.

sql/rpl_rli.cc

@@ -33,7 +33,10 @@ Relay_log_info::Relay_log_info()
   :Slave_reporting_capability("SQL"),
    no_storage(FALSE), replicate_same_server_id(::replicate_same_server_id),
    info_fd(-1), cur_log_fd(-1), save_temporary_tables(0),
-   group_relay_log_pos(0),
+   group_relay_log_pos(0), event_relay_log_pos(0),
+#if HAVE_purify
+   is_fake(FALSE),
+#endif
    cur_log_old_open_count(0), group_master_log_pos(0), log_space_total(0),
    ignore_log_space_limit(0), last_master_timestamp(0), slave_skip_counter(0),
    abort_pos_wait(0), slave_run_id(0), sql_thd(0),

sql/rpl_rli.h

@@ -154,6 +154,10 @@ class Relay_log_info : public Slave_reporting_capability
   ulonglong event_relay_log_pos;
   ulonglong future_event_relay_log_pos;
 
+#ifdef HAVE_purify
+  bool is_fake; /* Mark that this is a fake relay log info structure */
+#endif
+
   /* 
      Original log name and position of the group we're currently executing
      (whose coordinates are group_relay_log_name/pos in the relay log)

sql/slave.cc

@@ -1892,14 +1892,19 @@ int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli,
   if (exec_res == 0)
   {
     int error= ev->update_pos(rli);
-    char buf[22];
-    DBUG_PRINT("info", ("update_pos error = %d", error));
-    DBUG_PRINT("info", ("group %s %s",
-                        llstr(rli->group_relay_log_pos, buf),
-                        rli->group_relay_log_name));
-    DBUG_PRINT("info", ("event %s %s",
-                        llstr(rli->event_relay_log_pos, buf),
-                        rli->event_relay_log_name));
+#ifdef HAVE_purify
+    if (!rli->is_fake)
+#endif
+    {
+      char buf[22];
+      DBUG_PRINT("info", ("update_pos error = %d", error));
+      DBUG_PRINT("info", ("group %s %s",
+                          llstr(rli->group_relay_log_pos, buf),
+                          rli->group_relay_log_name));
+      DBUG_PRINT("info", ("event %s %s",
+                          llstr(rli->event_relay_log_pos, buf),
+                          rli->event_relay_log_name));
+    }
     /*
       The update should not fail, so print an error message and
       return an error code.
@@ -1909,6 +1914,7 @@ int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli,
     */
     if (error)
     {
+      char buf[22];
       rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                   "It was not possible to update the positions"
                   " of the relay log information: the slave may"

sql/sql_binlog.cc

@@ -56,6 +56,9 @@ void mysql_client_binlog_statement(THD* thd)
   if (!thd->rli_fake)
   {
     thd->rli_fake= new Relay_log_info;
+#ifdef HAVE_purify
+    thd->rli_fake->is_fake= TRUE;
+#endif
     have_fd_event= FALSE;
   }
   if (thd->rli_fake && !thd->rli_fake->relay_log.description_event_for_exec)