fix for bug#16434 (Events: Illegal dates don't cause errors)

(post-review commit)
WL#1034 (Internal CRON)


sql/event_timed.cc:
  remove bogus check
sql/share/errmsg.txt:
  change error messages
sql/sql_yacc.yy:
  handle error code returned by event_timed::init_starts()

sql/event_timed.cc

@@ -238,9 +238,6 @@ event_timed::init_starts(THD *thd, Item *new_starts)
   if (new_starts->fix_fields(thd, &new_starts))
     DBUG_RETURN(EVEX_PARSE_ERROR);
 
-  if (new_starts->val_int() == MYSQL_TIMESTAMP_ERROR)
-    DBUG_RETURN(EVEX_BAD_PARAMS);
-
   if ((not_used= new_starts->get_date(&ltime, TIME_NO_ZERO_DATE)))
     DBUG_RETURN(EVEX_BAD_PARAMS);
 

sql/share/errmsg.txt

@@ -5760,7 +5760,7 @@ ER_EVENT_DROP_FAILED
 ER_EVENT_INTERVAL_NOT_POSITIVE
         eng "INTERVAL must be positive"
 ER_EVENT_ENDS_BEFORE_STARTS
-        eng "ENDS must be after STARTS"
+        eng "ENDS is either invalid or before STARTS"
 ER_EVENT_EXEC_TIME_IN_THE_PAST
         eng "Activation (AT) time is in the past"
 ER_EVENT_OPEN_TABLE_FAILED

sql/sql_yacc.yy

@@ -1467,7 +1467,25 @@ ev_starts: /* empty */
           {
             LEX *lex= Lex;
             if (!lex->et_compile_phase)
-              lex->et->init_starts(YYTHD, $2);
+            {
+              
+              switch (lex->et->init_starts(YYTHD, $2)) {
+              case EVEX_PARSE_ERROR:
+                yyerror(ER(ER_SYNTAX_ERROR));
+                YYABORT;
+                break;
+              case EVEX_BAD_PARAMS:
+                {
+                  char buff[20];
+                  String str(buff,(uint32) sizeof(buff), system_charset_info);
+                  String *str2= $2->val_str(&str);
+                  my_error(ER_WRONG_VALUE, MYF(0), "STARTS", str2? str2->c_ptr():
+                                                                   NULL);
+                  YYABORT;
+                  break;
+                }
+              }
+            }
           }
       ;