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Bug#14275000

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Fixes for BUG11761686 left a flaw that managed to slip away from testing.
Only effective filtering branch was actually tested with a regression test
added to rpl_filter_tables_not_exist.
The reason of the failure is destuction of too early mem-root-allocated memory 
at the end of the deferred User-var's do_apply_event().

Fixed with bypassing free_root() in the deferred execution branch.
Deallocation of created in do_apply_event() items is done by the base code
through THD::cleanup_after_query() -> free_items() that the parent Query
can't miss.



sql/log_event.cc:
  Do not call free_root() in case the deferred User-var event.
  Necessary methods to the User-var class are added, do_apply_event() refined.
sql/log_event.h:
  Necessary methods to avoid destoying mem-root-based memory at
  User-var applying are defined.
This commit is contained in:
Andrei Elkin
2012-07-05 14:37:48 +03:00
parent 91c8e79fcd
commit e3c8fb4a1c
2 changed files with 22 additions and 5 deletions
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16
sql/log_event.cc
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@@ -5640,6 +5640,9 @@ User_var_log_event::
User_var_log_event(const char* buf,
const Format_description_log_event* description_event)
:Log_event(buf, description_event)
#ifndef MYSQL_CLIENT
, deferred(false)
#endif
{
/* The Post-Header is empty. The Variable Data part begins immediately. */
buf+= description_event->common_header_len +
@@ -5848,7 +5851,10 @@ int User_var_log_event::do_apply_event(Relay_log_info const *rli)
CHARSET_INFO *charset;
if (rli->deferred_events_collecting)
{
set_deferred();
return rli->deferred_events->add(this);
}
if (!(charset= get_charset(charset_number, MYF(MY_WME))))
return 1;
@@ -5900,7 +5906,8 @@ int User_var_log_event::do_apply_event(Relay_log_info const *rli)
return 0;
}
}
Item_func_set_user_var e(user_var_name, it);
Item_func_set_user_var *e= new Item_func_set_user_var(user_var_name, it);
/*
Item_func_set_user_var can't substitute something else on its place =>
0 can be passed as last argument (reference on item)
@@ -5909,7 +5916,7 @@ int User_var_log_event::do_apply_event(Relay_log_info const *rli)
crash the server, so if fix fields fails, we just return with an
error.
*/
if (e.fix_fields(thd, 0))
if (e->fix_fields(thd, 0))
return 1;
/*
@@ -5917,8 +5924,9 @@ int User_var_log_event::do_apply_event(Relay_log_info const *rli)
a single record and with a single column. Thus, like
a column value, it could always have IMPLICIT derivation.
*/
e.update_hash(val, val_len, type, charset, DERIVATION_IMPLICIT, 0);
free_root(thd->mem_root,0);
e->update_hash(val, val_len, type, charset, DERIVATION_IMPLICIT, 0);
if (!is_deferred())
free_root(thd->mem_root,0);
return 0;
}