Merge mysql.com:/home/gluh/MySQL/Merge/4.1-opt

into  mysql.com:/home/gluh/MySQL/Merge/5.0-opt

mysql-test/r/subselect.result

@@ -2854,6 +2854,8 @@ a
 4
 DROP TABLE t1,t2,t3;
 purge master logs before (select adddate(current_timestamp(), interval -4 day));
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select adddate(current_timestamp(), interval -4 day))' at line 1
+purge master logs before adddate(current_timestamp(), interval -4 day);
 CREATE TABLE t1 (f1 INT);
 CREATE TABLE t2 (f2 INT);
 INSERT INTO t1 VALUES (1);

mysql-test/t/subselect.test

@@ -1822,11 +1822,12 @@ SELECT * FROM t1
 DROP TABLE t1,t2,t3;
 
 #
-# BUG #10308: purge log with subselect
+# BUG#10308: purge log with subselect
+# Bug#28553: mysqld crash in "purge master log before(select time from information_schema)"
 #
-
+--error 1064
 purge master logs before (select adddate(current_timestamp(), interval -4 day));
-
+purge master logs before adddate(current_timestamp(), interval -4 day);
 
 #
 # Bug#18503: Queries with a quantified subquery returning empty set may

sql/sql_yacc.yy

@@ -5820,7 +5820,8 @@ select_derived2:
 	  LEX *lex= Lex;
 	  lex->derived_tables|= DERIVED_SUBQUERY;
           if (lex->sql_command == (int)SQLCOM_HA_READ ||
-              lex->sql_command == (int)SQLCOM_KILL)
+              lex->sql_command == (int)SQLCOM_KILL ||
+              lex->sql_command == (int)SQLCOM_PURGE)
 	  {
             my_parse_error(ER(ER_SYNTAX_ERROR));
 	    MYSQL_YYABORT;
@@ -7272,6 +7273,7 @@ purge:
 	{
 	  LEX *lex=Lex;
 	  lex->type=0;
+          lex->sql_command = SQLCOM_PURGE;
 	} purge_options
 	{}
 	;
@@ -7283,7 +7285,6 @@ purge_options:
 purge_option:
         TO_SYM TEXT_STRING_sys
         {
-	   Lex->sql_command = SQLCOM_PURGE;
 	   Lex->to_log = $2.str;
         }
 	| BEFORE_SYM expr
@@ -9402,7 +9403,8 @@ subselect_start:
 	{
 	  LEX *lex=Lex;
           if (lex->sql_command == (int)SQLCOM_HA_READ ||
-              lex->sql_command == (int)SQLCOM_KILL)
+              lex->sql_command == (int)SQLCOM_KILL ||
+              lex->sql_command == (int)SQLCOM_PURGE)
 	  {
             my_parse_error(ER(ER_SYNTAX_ERROR));
 	    MYSQL_YYABORT;