Fixed BUG#4905: Stored procedure doesn't clear for "Rows affected".

mysql-test/r/sp.result:
  New test case for BUG#4905
mysql-test/t/sp.test:
  New test case for BUG#4905
sql/sql_parse.cc:
  Reset row count before CALL.

mysql-test/r/sp.result

@@ -1894,6 +1894,32 @@ flush status|
 flush query cache|
 delete from t1|
 drop procedure bug3583|
+drop table if exists t3|
+drop procedure if exists bug4905|
+create table t3 (s1 int,primary key (s1))|
+create procedure bug4905()
+begin
+declare v int;
+declare continue handler for sqlstate '23000' set v = 5;
+insert into t3 values (1);
+end|
+call bug4905()|
+select row_count()|
+row_count()
+1
+call bug4905()|
+select row_count()|
+row_count()
+0
+call bug4905()|
+select row_count()|
+row_count()
+0
+select * from t3|
+s1
+1
+drop procedure bug4905|
+drop table t3|
 drop table if exists fac|
 create table fac (n int unsigned not null primary key, f bigint unsigned)|
 create procedure ifac(n int unsigned)

mysql-test/t/sp.test

@@ -2056,6 +2056,35 @@ flush query cache|
 delete from t1|
 drop procedure bug3583|
 
+#
+# BUG#4905: Stored procedure doesn't clear for "Rows affected"
+#
+--disable_warnings
+drop table if exists t3|
+drop procedure if exists bug4905|
+--enable_warnings
+
+create table t3 (s1 int,primary key (s1))|
+
+create procedure bug4905()
+begin
+  declare v int;
+  declare continue handler for sqlstate '23000' set v = 5;
+
+  insert into t3 values (1);
+end|
+
+call bug4905()|
+select row_count()|
+call bug4905()|
+select row_count()|
+call bug4905()|
+select row_count()|
+select * from t3|
+
+drop procedure bug4905|
+drop table t3|
+
 
 #
 # Some "real" examples

sql/sql_parse.cc

@@ -3724,6 +3724,7 @@ purposes internal to the MySQL server", MYF(0));
 	select_limit= thd->variables.select_limit;
 	thd->variables.select_limit= HA_POS_ERROR;
 
+	thd->row_count_func= 0;
 	res= sp->execute_procedure(thd, &lex->value_list);
 
 	thd->variables.select_limit= select_limit;