Fix for bug #13399 Crash when executing PS/SP which should activate trigger

which is now dropped" and bug #12329 "Bogus error msg when executing PS with
stored procedure after SP was re-created".


mysql-test/r/sp-error.result:
  Added test for bug #12329 "Bogus error msg when executing PS with stored
  procedure after SP was re-created".
mysql-test/r/trigger.result:
  Added test for bug #13399 Crash when executing PS/SP which should activate
  trigger which is now dropped".
mysql-test/t/sp-error.test:
  Added test for bug #12329 "Bogus error msg when executing PS with stored
  procedure after SP was re-created".
mysql-test/t/trigger.test:
  Added test for bug #13399 Crash when executing PS/SP which should activate
  trigger which is now dropped".
sql/sp_head.cc:
  sp_head::add_used_tables_to_table_list():
    We have to copy database/table names and alias to PS/SP memory since current
    instance of sp_head object can pass away before next execution of PS/SP for
    which tables are added to prelocking list.
    This will be fixed by introducing of proper invalidation mechanism once new
    TDC is ready.

mysql-test/r/sp-error.result

@@ -975,6 +975,24 @@ return 1;
 END |
 drop table t1|
 drop function bug_13627_f|
+drop function if exists bug12329;
+create table t1 as select 1 a;
+create table t2 as select 1 a;
+create function bug12329() returns int return (select a from t1);
+prepare stmt1 from 'select bug12329()';
+execute stmt1;
+bug12329()
+1
+drop function bug12329;
+create function bug12329() returns int return (select a+100 from t2);
+select bug12329();
+bug12329()
+101
+execute stmt1;
+ERROR HY000: Table 't2' was not locked with LOCK TABLES
+deallocate prepare stmt1;
+drop function bug12329;
+drop table t1, t2;
 create database mysqltest1;
 use mysqltest1;
 drop database mysqltest1;

mysql-test/r/trigger.result

@@ -738,3 +738,28 @@ f1
 1
 drop trigger t1_bi;
 drop tables t1, t2;
+create table t1 (id int);
+create table t2 (id int);
+create trigger t1_bi before insert on t1 for each row insert into t2 values (new.id);
+prepare stmt1 from "insert into t1 values (10)";
+create procedure p1() insert into t1 values (10);
+call p1();
+drop trigger t1_bi;
+execute stmt1;
+call p1();
+deallocate prepare stmt1;
+drop procedure p1;
+create table t3 (id int);
+create trigger t1_bi after insert on t1 for each row insert into t2 values (new.id);
+prepare stmt1 from "insert into t1 values (10)";
+create procedure p1() insert into t1 values (10);
+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;
+ERROR HY000: Table 't3' was not locked with LOCK TABLES
+call p1();
+ERROR HY000: Table 't3' was not locked with LOCK TABLES
+deallocate prepare stmt1;
+drop procedure p1;
+drop table t1, t2, t3;

mysql-test/t/sp-error.test

@@ -1403,6 +1403,28 @@ drop function bug_13627_f|
 
 delimiter ;|
 
+# BUG#12329: "Bogus error msg when executing PS with stored procedure after
+# SP was re-created". See also test for related bug#13399 in trigger.test
+--disable_warnings
+drop function if exists bug12329;
+--enable_warnings
+create table t1 as select 1 a;
+create table t2 as select 1 a;
+create function bug12329() returns int return (select a from t1);
+prepare stmt1 from 'select bug12329()';
+execute stmt1;
+drop function bug12329;
+create function bug12329() returns int return (select a+100 from t2);
+select bug12329();
+# Until we implement proper mechanism for invalidation of PS/SP when table
+# or SP's are changed the following statement will fail with 'Table ... was
+# not locked' error (this mechanism should be based on the new TDC).
+--error 1100 
+execute stmt1;
+deallocate prepare stmt1;
+drop function bug12329; 
+drop table t1, t2;
+
 #
 # Bug#13514 "server crash when create a stored procedure before choose a
 # database" and

mysql-test/t/trigger.test

@@ -875,3 +875,42 @@ drop function f1;
 drop view v1;
 drop table t1, t2, t3;
 --enable_parsing
+
+#
+# Test for bug #13399 "Crash when executing PS/SP which should activate
+# trigger which is now dropped". See also test for similar bug for stored
+# routines in sp-error.test (#12329).
+create table t1 (id int);
+create table t2 (id int);
+create trigger t1_bi before insert on t1 for each row insert into t2 values (new.id);
+prepare stmt1 from "insert into t1 values (10)";
+create procedure p1() insert into t1 values (10); 
+call p1();
+# Actually it is enough to do FLUSH TABLES instead of DROP TRIGGER
+drop trigger t1_bi;
+# Server should not crash on these two statements
+execute stmt1;
+call p1();
+deallocate prepare stmt1;
+drop procedure p1;
+
+# Let us test more complex situation when we alter trigger in such way that
+# it uses different set of tables (or simply add new trigger).
+create table t3 (id int);
+create trigger t1_bi after insert on t1 for each row insert into t2 values (new.id);
+prepare stmt1 from "insert into t1 values (10)";
+create procedure p1() insert into t1 values (10); 
+call p1();
+# Altering trigger forcing it use different set of tables
+drop trigger t1_bi;
+create trigger t1_bi after insert on t1 for each row insert into t3 values (new.id);
+# Until we implement proper mechanism for invalidation of PS/SP when table
+# or SP's are changed these two statements will fail with 'Table ... was
+# not locked' error (this mechanism should be based on the new TDC).
+--error 1100
+execute stmt1;
+--error 1100
+call p1();
+deallocate prepare stmt1;
+drop procedure p1;
+drop table t1, t2, t3;

sql/sp_head.cc

@@ -2906,33 +2906,34 @@ sp_head::add_used_tables_to_table_list(THD *thd,
   DBUG_ENTER("sp_head::add_used_tables_to_table_list");
 
   /*
-    Use persistent arena for table list allocation to be PS friendly.
+    Use persistent arena for table list allocation to be PS/SP friendly.
+    Note that we also have to copy database/table names and alias to PS/SP
+    memory since current instance of sp_head object can pass away before
+    next execution of PS/SP for which tables are added to prelocking list.
+    This will be fixed by introducing of proper invalidation mechanism
+    once new TDC is ready.
   */
   arena= thd->activate_stmt_arena_if_needed(&backup);
 
   for (i=0 ; i < m_sptabs.records ; i++)
   {
-    char *tab_buff;
+    char *tab_buff, *key_buff;
     TABLE_LIST *table;
     SP_TABLE *stab= (SP_TABLE *)hash_element(&m_sptabs, i);
     if (stab->temp)
       continue;
 
     if (!(tab_buff= (char *)thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST)) *
-                                        stab->lock_count)))
+                                        stab->lock_count)) ||
+        !(key_buff= (char*)thd->memdup(stab->qname.str,
+                                       stab->qname.length + 1)))
       DBUG_RETURN(FALSE);
 
     for (uint j= 0; j < stab->lock_count; j++)
     {
       table= (TABLE_LIST *)tab_buff;
 
-      /*
-        It's enough to just copy the pointers as the data will not change
-        during the lifetime of the SP. If the SP is used by PS, we assume
-        that the PS will be invalidated if the functions is deleted or
-        changed.
-      */
-      table->db= stab->qname.str;
+      table->db= key_buff;
       table->db_length= stab->db_length;
       table->table_name= table->db + table->db_length + 1;
       table->table_name_length= stab->table_name_length;