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From:ahristov Date:February 28 2006 10:43am
Subject:bk commit into 5.1 tree (andrey:1.2097) BUG#16537
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Below is the list of changes that have just been committed into a local
5.1 repository of andrey. When andrey does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2097 06/02/28 11:43:10 andrey@lmy004. +8 -0
  fix for bug#16537 (Events: mysql.event.starts is null)
  - now when the event is created and STARTS is omitted then STARTS is implicitly
    CURRENT_TIMESTAMP
  - This CS also fixed incorrect presentation of STARTS/ENDS in I_S.EVENTS
  (incorporated review changes)

  sql/sql_yacc.yy
    1.454 06/02/28 11:43:04 andrey@lmy004. +3 -0
    - if STARTS is omitted default to current_timestamp

  sql/sql_show.cc
    1.302 06/02/28 11:43:04 andrey@lmy004. +10 -13
    - don't show 0000-00-00 in I_S.EVENTS when the value is NULL

  sql/event_timed.cc
    1.25 06/02/28 11:43:03 andrey@lmy004. +78 -39
    - introduce xxx_null and change the usage of xxx.year to !xxx_null

  sql/event_executor.cc
    1.23 06/02/28 11:43:03 andrey@lmy004. +9 -8
    - check whether xxx_null instead of !xxxx.year

  sql/event.h
    1.18 06/02/28 11:43:03 andrey@lmy004. +3 -0
    - add flags whether starts, ends and execute_at are null or not

  sql/event.cc
    1.24 06/02/28 11:43:03 andrey@lmy004. +28 -24
    - check whether event_timed::starts_null only in case
      event_timed::expression is set, so for recurring events only
    - disable binlogging of CREATE EVENT statement. It should not be
      replicated but the result of the execution. Still the replication is
      untouched topic.

  mysql-test/t/events.test
    1.13 06/02/28 11:43:03 andrey@lmy004. +32 -0
    new test cases for bug #16537 (Events: mysql.event.starts is null)

  mysql-test/r/events.result
    1.12 06/02/28 11:43:03 andrey@lmy004. +49 -1
    results of new test cases

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	andrey
# Host:	lmy004.
# Root:	/work/mysql-5.1-bug16537

--- 1.301/sql/sql_show.cc	2006-02-09 09:34:36 +01:00
+++ 1.302/sql/sql_show.cc	2006-02-28 11:43:04 +01:00
@@ -3883,35 +3883,32 @@ fill_events_copy_to_schema_table(THD *th
   {
     //type
     sch_table->field[5]->store(STRING_WITH_LEN("RECURRING"), scs);
-    //execute_at
-    sch_table->field[6]->set_null();
     //interval_value
     sch_table->field[7]->set_notnull();
     sch_table->field[7]->store((longlong) et.expression);
+
     //interval_type
     LEX_STRING *ival=&interval_type_to_name[get_real_interval_type(et.interval)];
     sch_table->field[8]->set_notnull();
     sch_table->field[8]->store(ival->str, ival->length, scs);
-    //starts & ends
+
+    //starts & ends    
     sch_table->field[10]->set_notnull();
     sch_table->field[10]->store_time(&et.starts, MYSQL_TIMESTAMP_DATETIME);
-    sch_table->field[11]->set_notnull();
-    sch_table->field[11]->store_time(&et.ends, MYSQL_TIMESTAMP_DATETIME);
+
+    if (!et.ends_null)
+    {
+      sch_table->field[11]->set_notnull();
+      sch_table->field[11]->store_time(&et.ends, MYSQL_TIMESTAMP_DATETIME);
+    }
   }
   else
   {
     //type
     sch_table->field[5]->store(STRING_WITH_LEN("ONE TIME"), scs);
-    //execute_at
+
     sch_table->field[6]->set_notnull();
     sch_table->field[6]->store_time(&et.execute_at, MYSQL_TIMESTAMP_DATETIME);
-    //interval
-    sch_table->field[7]->set_null();
-    //interval_type
-    sch_table->field[8]->set_null();
-    //starts & ends
-    sch_table->field[10]->set_null();
-    sch_table->field[11]->set_null();
   }
 
   //status

--- 1.453/sql/sql_yacc.yy	2006-02-08 11:11:36 +01:00
+++ 1.454/sql/sql_yacc.yy	2006-02-28 11:43:04 +01:00
@@ -1475,6 +1475,9 @@ opt_ev_status: /* empty */ {$<ulong_num>
       ;
 
 ev_starts: /* empty */
+          {
+            Lex->et->init_starts(YYTHD, new Item_func_now_local());
+          }
         | STARTS_SYM expr
           {
             LEX *lex= Lex;

--- 1.11/mysql-test/r/events.result	2006-01-30 17:11:41 +01:00
+++ 1.12/mysql-test/r/events.result	2006-02-28 11:43:03 +01:00
@@ -13,6 +13,54 @@ alter event event3 rename to event2;
 drop event event2;
 create event event2 on schedule every 2 second starts now() ends date_add(now(), interval 5 hour) comment "some" DO begin end;
 drop event event2;
+CREATE EVENT event_starts_test ON SCHEDULE EVERY 10 SECOND COMMENT "" DO SELECT 1;
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	RECURRING	NULL	10	INTERVAL_SECOND	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+0	1	
+ALTER EVENT event_starts_test ON SCHEDULE AT '2020-02-02 20:00:02';
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	ONE TIME	2020-02-02 17:00:02	NULL	NULL	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+1	1	
+ALTER EVENT event_starts_test COMMENT "non-empty comment";
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	ONE TIME	2020-02-02 17:00:02	NULL	NULL	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+1	1	non-empty comment
+ALTER EVENT event_starts_test COMMENT "";
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	ONE TIME	2020-02-02 17:00:02	NULL	NULL	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+1	1	
+DROP EVENT event_starts_test;
+CREATE EVENT event_starts_test ON SCHEDULE EVERY 20 SECOND STARTS '2020-02-02 20:00:02' ENDS '2022-02-02 20:00:02' DO SELECT 2;
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	RECURRING	NULL	20	INTERVAL_SECOND	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+0	0	
+ALTER EVENT event_starts_test COMMENT "non-empty comment";
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	RECURRING	NULL	20	INTERVAL_SECOND	#	#	ENABLED
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+starts IS NULL	ends IS NULL	comment
+0	0	non-empty comment
+ALTER EVENT event_starts_test COMMENT "";
+SHOW EVENTS;
+Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
+events_test	event_starts_test	root@localhost	RECURRING	NULL	20	INTERVAL_SECOND	#	#	ENABLED
+DROP EVENT event_starts_test;
 create event e_43 on schedule every 1 second do set @a = 5;
 set global event_scheduler = 1;
 select sleep(2);
@@ -64,7 +112,7 @@ SHOW GRANTS;
 Grants for ev_test@localhost
 GRANT USAGE ON *.* TO 'ev_test'@'localhost'
 GRANT ALL PRIVILEGES ON `events_test`.* TO 'ev_test'@'localhost'
-GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE ON `events_test2`.* TO 'ev_test'@'localhost'
+GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, TRIGGER ON `events_test2`.* TO 'ev_test'@'localhost'
 "Here comes an error:";
 SHOW EVENTS;
 ERROR 42000: Access denied for user 'ev_test'@'localhost' to database 'events_test2'

--- 1.12/mysql-test/t/events.test	2006-01-30 17:11:42 +01:00
+++ 1.13/mysql-test/t/events.test	2006-02-28 11:43:03 +01:00
@@ -15,6 +15,38 @@ drop event event2;
 create event event2 on schedule every 2 second starts now() ends date_add(now(), interval 5 hour) comment "some" DO begin end;
 drop event event2;
 
+# BUG #16537 (Events: mysql.event.starts is null)
+CREATE EVENT event_starts_test ON SCHEDULE EVERY 10 SECOND COMMENT "" DO SELECT 1;
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+ALTER EVENT event_starts_test ON SCHEDULE AT '2020-02-02 20:00:02';
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+ALTER EVENT event_starts_test COMMENT "non-empty comment";
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+ALTER EVENT event_starts_test COMMENT "";
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+DROP EVENT event_starts_test;
+CREATE EVENT event_starts_test ON SCHEDULE EVERY 20 SECOND STARTS '2020-02-02 20:00:02' ENDS '2022-02-02 20:00:02' DO SELECT 2;
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+ALTER EVENT event_starts_test COMMENT "non-empty comment";
+--replace_column 8 # 9 #
+SHOW EVENTS;
+SELECT starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test';
+ALTER EVENT event_starts_test COMMENT "";
+--replace_column 8 # 9 #
+SHOW EVENTS;
+DROP EVENT event_starts_test;
+#
+#
 create event e_43 on schedule every 1 second do set @a = 5;
 set global event_scheduler = 1;
 select sleep(2);

--- 1.23/sql/event.cc	2006-01-30 13:31:16 +01:00
+++ 1.24/sql/event.cc	2006-02-28 11:43:03 +01:00
@@ -273,20 +273,6 @@ evex_fill_row(THD *thd, TABLE *table, ev
                      store(et->body.str, et->body.length, system_charset_info))
       goto trunc_err;
 
-  if (et->starts.year)
-  {
-    table->field[EVEX_FIELD_STARTS]->set_notnull();// set NULL flag to OFF
-    table->field[EVEX_FIELD_STARTS]->
-                          store_time(&et->starts, MYSQL_TIMESTAMP_DATETIME);
-  }	   
-
-  if (et->ends.year)
-  {
-    table->field[EVEX_FIELD_ENDS]->set_notnull();
-    table->field[EVEX_FIELD_ENDS]->
-                          store_time(&et->ends, MYSQL_TIMESTAMP_DATETIME);
-  }
-   
   if (et->expression)
   {
     table->field[EVEX_FIELD_INTERVAL_EXPR]->set_notnull();
@@ -300,18 +286,31 @@ evex_fill_row(THD *thd, TABLE *table, ev
     table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->store((longlong)et->interval+1);
 
     table->field[EVEX_FIELD_EXECUTE_AT]->set_null();
+
+    if (!et->starts_null)
+    {
+      table->field[EVEX_FIELD_STARTS]->set_notnull();// set NULL flag to OFF
+      table->field[EVEX_FIELD_STARTS]->
+                            store_time(&et->starts, MYSQL_TIMESTAMP_DATETIME);
+    }	   
+
+    if (!et->ends_null)
+    {
+      table->field[EVEX_FIELD_ENDS]->set_notnull();
+      table->field[EVEX_FIELD_ENDS]->
+                            store_time(&et->ends, MYSQL_TIMESTAMP_DATETIME);
+    }
   }
   else if (et->execute_at.year)
   {
-    // fix_fields already called in init_execute_at
     table->field[EVEX_FIELD_INTERVAL_EXPR]->set_null();
     table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null();
-
+    table->field[EVEX_FIELD_STARTS]->set_null();
+    table->field[EVEX_FIELD_ENDS]->set_null();
+    
     table->field[EVEX_FIELD_EXECUTE_AT]->set_notnull();
     table->field[EVEX_FIELD_EXECUTE_AT]->store_time(&et->execute_at,
                                                     MYSQL_TIMESTAMP_DATETIME);    
-    
-    table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null();  
   }
   else
   {
@@ -322,14 +321,17 @@ evex_fill_row(THD *thd, TABLE *table, ev
     
   ((Field_timestamp *)table->field[EVEX_FIELD_MODIFIED])->set_time();
 
-  if (et->comment.length)
-    if (table->field[field_num= EVEX_FIELD_COMMENT]->
-	store(et->comment.str, et->comment.length, system_charset_info))
+  if (et->comment.str)
+  {
+    if (table->field[field_num= EVEX_FIELD_COMMENT]->store(et->comment.str,
+                                                           et->comment.length,
+                                                           system_charset_info))
       goto trunc_err;
+  }
 
   DBUG_RETURN(0);
 trunc_err:
-  my_error(ER_EVENT_DATA_TOO_LONG, MYF(0));
+  my_error(ER_EVENT_DATA_TOO_LONG, MYF(0), table->field[field_num]->field_name);
   DBUG_RETURN(EVEX_GENERAL_ERROR);
 }
 
@@ -442,14 +444,16 @@ db_create_event(THD *thd, event_timed *e
     my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret);
     goto err;
   }
-  
+
+#ifdef USE_THIS_CODE_AS_TEMPLATE_WHEN_EVENT_REPLICATION_IS_AGREED   
   if (mysql_bin_log.is_open())
   {
     thd->clear_error();
-    /* Such a statement can always go directly to binlog, no trans cache */
+    // Such a statement can always go directly to binlog, no trans cache
     thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                       thd->query, thd->query_length, FALSE, FALSE);
   }
+#endif
   
   *rows_affected= 1;
 ok:

--- 1.17/sql/event.h	2006-01-31 17:22:28 +01:00
+++ 1.18/sql/event.h	2006-02-28 11:43:03 +01:00
@@ -100,6 +100,9 @@ public:
   TIME starts;
   TIME ends;
   TIME execute_at;
+  my_bool starts_null;
+  my_bool ends_null;
+  my_bool execute_at_null;
 
   longlong expression;
   interval_type interval;

--- 1.22/sql/event_executor.cc	2006-01-30 17:54:11 +01:00
+++ 1.23/sql/event_executor.cc	2006-02-28 11:43:03 +01:00
@@ -203,7 +203,7 @@ event_executor_main(void *arg)
 
   if (init_event_thread(thd))
     goto err;
-  
+
   // make this thread invisible it has no vio -> show processlist won't see
   thd->system_thread= 1;
 
@@ -321,8 +321,7 @@ event_executor_main(void *arg)
     et= evex_queue_first_element(&EVEX_EQ_NAME, event_timed*);
     DBUG_PRINT("evex main thread",("got event from the queue"));
       
-    if (et->execute_at.year > 1969 &&
-        my_time_compare(&time_now, &et->execute_at) == -1)
+    if (!et->execute_at_null && my_time_compare(&time_now,&et->execute_at) == -1)
     {
       DBUG_PRINT("evex main thread",("still not the time for execution"));
       VOID(pthread_mutex_unlock(&LOCK_event_arrays));
@@ -359,8 +358,11 @@ event_executor_main(void *arg)
 #else
       event_executor_worker((void *) et);
 #endif
-      if ((et->execute_at.year && !et->expression) ||
-           TIME_to_ulonglong_datetime(&et->execute_at) == 0)
+      /*
+        1. For one-time event : year is > 0 and expression is 0
+        2. For recurring, expression is != -=> check execute_at_null in this case
+      */
+      if ((et->execute_at.year && !et->expression) || et->execute_at_null)
          et->flags |= EVENT_EXEC_NO_MORE;
 
       if ((et->flags & EVENT_EXEC_NO_MORE) || et->status == MYSQL_EVENT_DISABLED)
@@ -481,9 +483,9 @@ event_executor_worker(void *event_void)
 #endif
 
   // thd->security_ctx->priv_host is char[MAX_HOSTNAME]
-  
+
   strxnmov(thd->security_ctx->priv_host, sizeof(thd->security_ctx->priv_host),
-                event->definer_host.str, NullS);  
+                event->definer_host.str, NullS);
 
   thd->security_ctx->user= thd->security_ctx->priv_user=
                              my_strdup(event->definer_user.str, MYF(0));
@@ -506,7 +508,6 @@ event_executor_worker(void *event_void)
     if (ret == EVEX_COMPILE_ERROR)
       sql_print_information("    EVEX COMPILE ERROR for event %s.%s",
                              event->dbname.str, event->name.str);
-    
     DBUG_PRINT("info", ("    EVEX EXECUTED event %s.%s  [EXPR:%d]. RetCode=%d",
                         event->dbname.str, event->name.str,
                         (int) event->expression, ret));

--- 1.24/sql/event_timed.cc	2006-01-30 17:54:11 +01:00
+++ 1.25/sql/event_timed.cc	2006-02-28 11:43:03 +01:00
@@ -41,6 +41,7 @@ event_timed::init()
   set_zero_time(&ends, MYSQL_TIMESTAMP_DATETIME);
   set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
   set_zero_time(&last_executed, MYSQL_TIMESTAMP_DATETIME);
+  starts_null= ends_null= execute_at_null= TRUE;
 
   definer_user.str= definer_host.str= 0;
   definer_user.length= definer_host.length= 0;
@@ -141,14 +142,18 @@ event_timed::init_execute_at(THD *thd, I
 {
   my_bool not_used;
   TIME ltime;
-  my_time_t my_time_tmp;
 
   TIME time_tmp;
   DBUG_ENTER("event_timed::init_execute_at");
 
   if (expr->fix_fields(thd, &expr))
     DBUG_RETURN(EVEX_PARSE_ERROR);
-
+  
+  /* no starts and/or ends in case of execute_at */
+  DBUG_PRINT("info", ("starts_null && ends_null should be 1 is %d",
+              (starts_null && ends_null)))
+  DBUG_ASSERT(starts_null && ends_null);
+  
   // let's check whether time is in the past
   thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp, 
                               (my_time_t) thd->query_start()); 
@@ -161,14 +166,13 @@ event_timed::init_execute_at(THD *thd, I
       TIME_to_ulonglong_datetime(&time_tmp))
     DBUG_RETURN(EVEX_BAD_PARAMS);
 
-
   /*
       This may result in a 1970-01-01 date if ltime is > 2037-xx-xx
       CONVERT_TZ has similar problem
   */
   my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd,&ltime, &not_used));
 
-
+  execute_at_null= FALSE;
   execute_at= ltime;
   DBUG_RETURN(0);
 }
@@ -303,7 +307,7 @@ event_timed::init_starts(THD *thd, Item 
   if ((not_used= new_starts->get_date(&ltime, TIME_NO_ZERO_DATE)))
     DBUG_RETURN(EVEX_BAD_PARAMS);
 
-  // let's check whether time is in the past
+  /* let's check whether time is in the past */
   thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp, 
                               (my_time_t) thd->query_start()); 
 
@@ -320,6 +324,7 @@ event_timed::init_starts(THD *thd, Item 
   my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd, &ltime, &not_used));
 
   starts= ltime;
+  starts_null= FALSE;
   DBUG_RETURN(0);
 }
 
@@ -329,7 +334,7 @@ event_timed::init_starts(THD *thd, Item 
 
  SYNOPSIS
    event_timed::init_ends()
-     thd      THD
+     thd       THD
      new_ends  when?
 
  NOTES
@@ -342,15 +347,14 @@ event_timed::init_starts(THD *thd, Item 
 
  RETURNS
    0 - OK
-   EVEX_PARSE_ERROR - fix_fields failed
-   EVEX_BAD_PARAMS  - ENDS before STARTS
+   EVEX_PARSE_ERROR  fix_fields failed
+   EVEX_BAD_PARAMS   ENDS before STARTS
 */
 
 int 
 event_timed::init_ends(THD *thd, Item *new_ends)
 {
-  TIME ltime;
-  my_time_t my_time_tmp;
+  TIME ltime, ltime_now;
   my_bool not_used;
 
   DBUG_ENTER("event_timed::init_ends");
@@ -358,20 +362,34 @@ event_timed::init_ends(THD *thd, Item *n
   if (new_ends->fix_fields(thd, &new_ends))
     DBUG_RETURN(EVEX_PARSE_ERROR);
 
-  // the field was already fixed in init_ends
+  DBUG_PRINT("info", ("convert to TIME"));
   if ((not_used= new_ends->get_date(&ltime, TIME_NO_ZERO_DATE)))
     DBUG_RETURN(EVEX_BAD_PARAMS);
 
   /*
-    This may result in a 1970-01-01 date if ltime is > 2037-xx-xx
-    CONVERT_TZ has similar problem
+    This may result in a 1970-01-01 date if ltime is > 2037-xx-xx ?
+    CONVERT_TZ has similar problem ?
   */
+  DBUG_PRINT("info", ("get the UTC time"));
   my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd, &ltime, &not_used));
- 
-  if (starts.year && my_time_compare(&starts, &ltime) != -1)
+
+  /* Check whether ends is after starts */
+  DBUG_PRINT("info", ("ENDS after STARTS?"));
+  if (!starts_null && my_time_compare(&starts, &ltime) != -1)
+    DBUG_RETURN(EVEX_BAD_PARAMS);
+
+  /*
+    The parser forces starts to be provided but one day STARTS could be
+    set before NOW() and in this case the following check should be done.
+    Check whether ENDS is not in the past.
+  */
+  DBUG_PRINT("info", ("ENDS after NOW?"));
+  my_tz_UTC->gmt_sec_to_TIME(&ltime_now, thd->query_start());  
+  if (my_time_compare(&ltime_now, &ltime) == 1)
     DBUG_RETURN(EVEX_BAD_PARAMS);
 
   ends= ltime;
+  ends_null= FALSE;
   DBUG_RETURN(0);
 }
 
@@ -391,7 +409,7 @@ event_timed::init_comment(THD *thd, LEX_
   DBUG_ENTER("event_timed::init_comment");
 
   comment.str= strmake_root(thd->mem_root, set_comment->str,
-                              comment.length= set_comment->length);
+                            comment.length= set_comment->length);
 
   DBUG_VOID_RETURN;
 }
@@ -498,28 +516,37 @@ event_timed::load_from_row(MEM_ROOT *mem
   et->definer_host.str= strmake_root(mem_root, ptr + 1, len);//1: because of @
   et->definer_host.length= len;
   
-  res1= table->field[EVEX_FIELD_STARTS]->
-                     get_date(&et->starts, TIME_NO_ZERO_DATE);
+  et->starts_null= table->field[EVEX_FIELD_STARTS]->is_null();
+  res1= table->field[EVEX_FIELD_STARTS]->get_date(&et->starts,TIME_NO_ZERO_DATE);
 
-  res2= table->field[EVEX_FIELD_ENDS]->
-                     get_date(&et->ends, TIME_NO_ZERO_DATE);
+  et->ends_null= table->field[EVEX_FIELD_ENDS]->is_null();
+  res2= table->field[EVEX_FIELD_ENDS]->get_date(&et->ends, TIME_NO_ZERO_DATE);
   
-  et->expression= table->field[EVEX_FIELD_INTERVAL_EXPR]->val_int();
-
+  if (!table->field[EVEX_FIELD_INTERVAL_EXPR]->is_null())
+    et->expression= table->field[EVEX_FIELD_INTERVAL_EXPR]->val_int();
+  else
+    et->expression= 0;
   /*
     If res1 and res2 are true then both fields are empty.
 	Hence if EVEX_FIELD_EXECUTE_AT is empty there is an error.
   */
-  if (res1 && res2 && !et->expression && table->field[EVEX_FIELD_EXECUTE_AT]->
-                get_date(&et->execute_at, TIME_NO_ZERO_DATE))
+  et->execute_at_null= table->field[EVEX_FIELD_EXECUTE_AT]->is_null();
+  DBUG_ASSERT(!(et->starts_null && et->ends_null && !et->expression &&
+              et->execute_at_null));
+  if (!et->expression &&
+      table->field[EVEX_FIELD_EXECUTE_AT]->get_date(&et->execute_at,
+                                                     TIME_NO_ZERO_DATE))
     goto error;
 
   /*
     In DB the values start from 1 but enum interval_type starts
     from 0
   */
-  et->interval= (interval_type)
+  if (!table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->is_null())
+    et->interval= (interval_type)
        ((ulonglong) table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->val_int() - 1);
+  else
+    et->interval= (interval_type) 0;
 
   et->modified= table->field[EVEX_FIELD_CREATED]->val_int();
   et->created= table->field[EVEX_FIELD_MODIFIED]->val_int();
@@ -676,14 +703,11 @@ event_timed::compute_next_execution_time
     //let's check whether it was executed
     if (last_executed.year)
     {
-      DBUG_PRINT("compute_next_execution_time",
-                ("One-time event %s was already executed", name.str));
-      if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
-      {
-        DBUG_PRINT("compute_next_execution_time",
-                          ("One-time event will be dropped."));
-        dropped= true;
-      }
+      DBUG_PRINT("info",("One-time event %s.%s of was already executed",
+                         dbname.str, name.str, definer.str));
+      dropped= (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP);
+      DBUG_PRINT("info",("One-time event will be dropped=%d.", dropped));
+
       status= MYSQL_EVENT_DISABLED;
       status_changed= true;
     }
@@ -710,10 +734,11 @@ event_timed::compute_next_execution_time
 #endif
 
   //if time_now is after ends don't execute anymore
-  if (ends.year && (tmp= my_time_compare(&ends, &time_now)) == -1)
+  if (!ends_null && (tmp= my_time_compare(&ends, &time_now)) == -1)
   {
     // time_now is after ends. don't execute anymore
     set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
+    execute_at_null= TRUE;
     if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
       dropped= true;
     status= MYSQL_EVENT_DISABLED;
@@ -727,7 +752,7 @@ event_timed::compute_next_execution_time
      Let's check whether time_now is before starts.
      If so schedule for starts
   */
-  if (starts.year && (tmp= my_time_compare(&time_now, &starts)) < 1)
+  if (!starts_null && (tmp= my_time_compare(&time_now, &starts)) < 1)
   {
     if (tmp == 0 && my_time_compare(&starts, &last_executed) == 0)
     {
@@ -743,11 +768,12 @@ event_timed::compute_next_execution_time
         time_now before starts. Scheduling for starts
       */
       execute_at= starts;
+      execute_at_null= FALSE;
       goto ret;
     }
   }
   
-  if (starts.year && ends.year)
+  if (!starts_null && !ends_null)
   {
     /* 
       Both starts and m_ends are set and time_now is between them (incl.)
@@ -756,7 +782,10 @@ event_timed::compute_next_execution_time
       If not set then schedule for now.
     */
     if (!last_executed.year)
+    {
       execute_at= time_now;
+      execute_at_null= FALSE;
+    }
     else
     {
       TIME next_exec;
@@ -769,15 +798,19 @@ event_timed::compute_next_execution_time
       {
         // Next execution after ends. No more executions
         set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
+        execute_at_null= TRUE;
         if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
           dropped= true;
       }
       else
+      {
         execute_at= next_exec;
+        execute_at_null= FALSE;
+      }
     }
     goto ret;
   }
-  else if (!starts.year && !ends.year)
+  else if (starts_null && ends_null)
   {
     // both starts and m_ends are not set, se we schedule for the next
     // based on last_executed
@@ -789,11 +822,12 @@ event_timed::compute_next_execution_time
     else
        //last_executed not set. Schedule the event for now
       execute_at= time_now;
+    execute_at_null= FALSE;
   }
   else
   {
     //either starts or m_ends is set
-    if (starts.year)
+    if (!starts_null)
     {
       /*
         - starts is set.
@@ -808,6 +842,7 @@ event_timed::compute_next_execution_time
       }
       else
         execute_at= starts;
+      execute_at_null= FALSE;
     }
     else
     {
@@ -830,11 +865,15 @@ event_timed::compute_next_execution_time
         if (my_time_compare(&ends, &next_exec) == -1)
         {
           set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
+          execute_at_null= TRUE;
           if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
             dropped= true;
         }
         else
+        {
           execute_at= next_exec;
+          execute_at_null= FALSE;
+        }
       }
     }
     goto ret;
@@ -1025,7 +1064,7 @@ event_timed::execute(THD *thd, MEM_ROOT 
   
   if (!sphead && (ret= compile(thd, mem_root)))
     goto done;
-  
+ 
   ret= sphead->execute_procedure(thd, &empty_item_list);
 
   VOID(pthread_mutex_lock(&this->LOCK_running));
Thread
bk commit into 5.1 tree (andrey:1.2097) BUG#16537ahristov28 Feb