Patch for Bug#11765684 (58674: SP-cache does not detect changes in

pre-locking list caused by triggers).

The thing is that CREATE TRIGGER / DROP TRIGGER may actually
change pre-locking list of (some) stored routines.

The SP-cache does not detect such changes. Thus if sp_head-instance
is cached in SP-cache, subsequent executions of the cached
sp_head will use inaccurate pre-locking list.

The patch is to invalidate SP-cache on CREATE TRIGGER / DROP TRIGGER.

mysql-test/r/sp.result

@@ -7452,4 +7452,34 @@ c1
 # Cleanup
 drop table t1;
 drop procedure p1;
+
+# --
+# -- Bug 11765684 - 58674: SP-cache does not detect changes in
+# -- pre-locking list caused by triggers
+# --- 
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t3;
+DROP PROCEDURE IF EXISTS p1;
+CREATE TABLE t1(a INT);
+CREATE TABLE t2(a INT);
+CREATE TABLE t3(a INT);
+CREATE PROCEDURE p1()
+INSERT INTO t1(a) VALUES (1);
+
+CREATE TRIGGER t1_ai AFTER INSERT ON t1
+FOR EACH ROW
+INSERT INTO t2(a) VALUES (new.a);
+
+CALL p1();
+
+CREATE TRIGGER t1_bi BEFORE INSERT ON t1
+FOR EACH ROW
+INSERT INTO t3(a) VALUES (new.a);
+
+CALL p1();
+
+DROP TABLE t1, t2, t3;
+DROP PROCEDURE p1;
+
 # End of 5.5 test

mysql-test/r/trigger.result

@@ -821,7 +821,6 @@ drop trigger t1_bi;
 create trigger t1_bi after insert on t1 for each row insert into t3 values (new.id);
 execute stmt1;
 call p1();
-ERROR 42S02: Table 'test.t3' doesn't exist
 deallocate prepare stmt1;
 drop procedure p1;
 drop table t1, t2, t3;

mysql-test/t/sp.test

@@ -8713,4 +8713,45 @@ call p1(3, 2);
 drop table t1;
 drop procedure p1;
 
+--echo
+--echo # --
+--echo # -- Bug 11765684 - 58674: SP-cache does not detect changes in
+--echo # -- pre-locking list caused by triggers
+--echo # --- 
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t3;
+DROP PROCEDURE IF EXISTS p1;
+--enable_warnings
+
+CREATE TABLE t1(a INT);
+CREATE TABLE t2(a INT);
+CREATE TABLE t3(a INT);
+
+CREATE PROCEDURE p1()
+  INSERT INTO t1(a) VALUES (1);
+
+--echo
+CREATE TRIGGER t1_ai AFTER INSERT ON t1
+  FOR EACH ROW
+    INSERT INTO t2(a) VALUES (new.a);
+
+--echo
+CALL p1();
+
+--echo
+CREATE TRIGGER t1_bi BEFORE INSERT ON t1
+  FOR EACH ROW
+    INSERT INTO t3(a) VALUES (new.a);
+
+--echo
+CALL p1();
+
+--echo
+DROP TABLE t1, t2, t3;
+DROP PROCEDURE p1;
+--echo
+
 --echo # End of 5.5 test

mysql-test/t/trigger.test

@@ -998,10 +998,6 @@ call p1();
 drop trigger t1_bi;
 create trigger t1_bi after insert on t1 for each row insert into t3 values (new.id);
 execute stmt1;
-# Until we implement proper mechanism for invalidation of SP statements
-# invoked whenever a table used in SP changes, this statement will fail with
-# 'Table ...  does not exist' error.
---error ER_NO_SUCH_TABLE 
 call p1();
 deallocate prepare stmt1;
 drop procedure p1;

sql/sql_trigger.cc

@@ -30,6 +30,7 @@
 #include "sql_db.h"                        // get_default_db_collation
 #include "sql_acl.h"                       // *_ACL, is_acl_user
 #include "sql_handler.h"                        // mysql_ha_rm_tables
+#include "sp_cache.h"                     // sp_invalidate_cache
 
 /*************************************************************************/
 
@@ -517,6 +518,12 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
   */
   thd->locked_tables_list.reopen_tables(thd);
 
+  /*
+    Invalidate SP-cache. That's needed because triggers may change list of
+    pre-locking tables.
+  */
+  sp_cache_invalidate();
+
 end:
   if (!result)
   {