Fix for bug#23760 ROW_COUNT() and store procedure not owrking together

The problem was that THD::row_count_func was zeroed too. It was zeroed
as a fix for bug 4905 "Stored procedure doesn't clear for "Rows affected"
However, the proper solution is not to zero, because THD::row_count_func has
been set to -1 already in mysql_execute_command(), a later fix, which obsoletes
the incorrect fix of #4095

mysql-test/r/sp.result

@@ -2705,11 +2705,11 @@ row_count()
 call bug4905()|
 select row_count()|
 row_count()
-0
+-1
 call bug4905()|
 select row_count()|
 row_count()
-0
+-1
 select * from t3|
 s1
 1
@@ -5471,4 +5471,85 @@ CHF
 DROP FUNCTION bug21493|
 DROP TABLE t3,t4|
 End of 5.0 tests
+DROP TABLE IF EXISTS bug23760|
+DROP TABLE IF EXISTS bug23760_log|
+DROP PROCEDURE IF EXISTS bug23760_update_log|
+DROP PROCEDURE IF EXISTS bug23760_test_row_count|
+DROP FUNCTION IF EXISTS bug23760_rc_test|
+CREATE TABLE bug23760 (
+id INT NOT NULL AUTO_INCREMENT ,
+num INT NOT NULL ,
+PRIMARY KEY ( id ) 
+)|
+CREATE TABLE bug23760_log (
+id INT NOT NULL AUTO_INCREMENT ,
+reason VARCHAR(50)NULL ,
+ammount INT NOT NULL ,
+PRIMARY KEY ( id ) 
+)|
+CREATE PROCEDURE bug23760_update_log(r Varchar(50), a INT)
+BEGIN
+INSERT INTO bug23760_log (reason, ammount) VALUES(r, a);
+END|
+CREATE PROCEDURE bug23760_test_row_count()
+BEGIN
+UPDATE bug23760 SET num = num + 1;
+CALL bug23760_update_log('Test is working', ROW_COUNT());
+UPDATE bug23760 SET num = num - 1;
+END|
+CREATE PROCEDURE bug23760_test_row_count2(level INT)
+BEGIN
+IF level THEN
+UPDATE bug23760 SET num = num + 1;
+CALL bug23760_update_log('Test2 is working', ROW_COUNT());
+CALL bug23760_test_row_count2(level - 1);
+END IF;
+END|
+CREATE FUNCTION bug23760_rc_test(in_var INT) RETURNS INT RETURN in_var|
+INSERT INTO bug23760 (num) VALUES (0), (1), (1), (2), (3), (5), (8)|
+SELECT ROW_COUNT()|
+ROW_COUNT()
+7
+CALL bug23760_test_row_count()|
+SELECT * FROM bug23760_log ORDER BY id|
+id	reason	ammount
+1	Test is working	7
+SET @save_max_sp_recursion= @@max_sp_recursion_depth|
+SELECT @save_max_sp_recursion|
+@save_max_sp_recursion
+0
+SET max_sp_recursion_depth= 5|
+SELECT @@max_sp_recursion_depth|
+@@max_sp_recursion_depth
+5
+CALL bug23760_test_row_count2(2)|
+SELECT ROW_COUNT()|
+ROW_COUNT()
+1
+SELECT * FROM bug23760_log ORDER BY id|
+id	reason	ammount
+1	Test is working	7
+2	Test2 is working	7
+3	Test2 is working	7
+SELECT * FROM bug23760 ORDER by ID|
+id	num
+1	2
+2	3
+3	3
+4	4
+5	5
+6	7
+7	10
+SET max_sp_recursion_depth= @save_max_sp_recursion|
+SELECT bug23760_rc_test(123)|
+bug23760_rc_test(123)
+123
+INSERT INTO bug23760 (num) VALUES (13), (21), (34), (55)|
+SELECT bug23760_rc_test(ROW_COUNT())|
+bug23760_rc_test(ROW_COUNT())
+4
+DROP TABLE bug23760, bug23760_log|
+DROP PROCEDURE bug23760_update_log|
+DROP PROCEDURE bug23760_test_row_count|
+DROP FUNCTION bug23760_rc_test|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -6426,6 +6426,83 @@ DROP TABLE t3,t4|
 --echo End of 5.0 tests
 
 
+#
+# BUG#23760: ROW_COUNT() and store procedure not owrking together
+#
+--disable_warnings
+DROP TABLE IF EXISTS bug23760|
+DROP TABLE IF EXISTS bug23760_log|
+DROP PROCEDURE IF EXISTS bug23760_update_log|
+DROP PROCEDURE IF EXISTS bug23760_test_row_count|
+DROP FUNCTION IF EXISTS bug23760_rc_test|
+--enable_warnings
+CREATE TABLE bug23760 (
+  id INT NOT NULL AUTO_INCREMENT ,
+  num INT NOT NULL ,
+  PRIMARY KEY ( id ) 
+)|
+
+CREATE TABLE bug23760_log (
+ id INT NOT NULL AUTO_INCREMENT ,
+ reason VARCHAR(50)NULL ,
+ ammount INT NOT NULL ,
+  PRIMARY KEY ( id ) 
+)|
+
+CREATE PROCEDURE bug23760_update_log(r Varchar(50), a INT)
+BEGIN
+  INSERT INTO bug23760_log (reason, ammount) VALUES(r, a);
+END|
+
+CREATE PROCEDURE bug23760_test_row_count()
+BEGIN
+  UPDATE bug23760 SET num = num + 1;
+  CALL bug23760_update_log('Test is working', ROW_COUNT());
+  UPDATE bug23760 SET num = num - 1;
+END|
+
+
+CREATE PROCEDURE bug23760_test_row_count2(level INT)
+BEGIN
+  IF level THEN
+    UPDATE bug23760 SET num = num + 1;
+    CALL bug23760_update_log('Test2 is working', ROW_COUNT());
+    CALL bug23760_test_row_count2(level - 1);
+  END IF;
+END|
+
+CREATE FUNCTION bug23760_rc_test(in_var INT) RETURNS INT RETURN in_var|
+
+INSERT INTO bug23760 (num) VALUES (0), (1), (1), (2), (3), (5), (8)|
+SELECT ROW_COUNT()|
+
+CALL bug23760_test_row_count()|
+SELECT * FROM bug23760_log ORDER BY id|
+
+SET @save_max_sp_recursion= @@max_sp_recursion_depth|
+SELECT @save_max_sp_recursion|
+SET max_sp_recursion_depth= 5|
+SELECT @@max_sp_recursion_depth|
+CALL bug23760_test_row_count2(2)|
+SELECT ROW_COUNT()|
+SELECT * FROM bug23760_log ORDER BY id|
+SELECT * FROM bug23760 ORDER by ID|
+SET max_sp_recursion_depth= @save_max_sp_recursion|
+
+SELECT bug23760_rc_test(123)|
+INSERT INTO bug23760 (num) VALUES (13), (21), (34), (55)|
+SELECT bug23760_rc_test(ROW_COUNT())|
+
+DROP TABLE bug23760, bug23760_log|
+DROP PROCEDURE bug23760_update_log|
+DROP PROCEDURE bug23760_test_row_count|
+DROP FUNCTION bug23760_rc_test|
+
+#
+# NOTE: The delimiter is `|`, and not `;`. It is changed to `;`
+#       at the end of the file!
+#
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/sql_parse.cc

@@ -4456,8 +4456,6 @@ end_with_restore_list:
 	select_limit= thd->variables.select_limit;
 	thd->variables.select_limit= HA_POS_ERROR;
 
-        thd->row_count_func= 0;
-        
         /* 
           We never write CALL statements into binlog:
            - If the mode is non-prelocked, each statement will be logged