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MWL#182: Explain running statements

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- Address feedback from the second code review.
This commit is contained in:
Sergey Petrunya
2012-07-17 21:52:08 +04:00
parent a49b4c970f
commit 2368f8895d
12 changed files with 201 additions and 184 deletions
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36
sql/sql_class.h
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@ -1520,39 +1520,7 @@ private:
extern "C" void my_message_sql(uint error, const char *str, myf MyFlags);
class select_result_explain_buffer;
/*
SHOW EXPLAIN request object.
The thread that runs SHOW EXPLAIN statement creates a Show_explain_request
object R, and then schedules APC call of
Show_explain_request::call((void*)&R).
*/
class Show_explain_request : public Apc_target::Apc_call
{
public:
THD *target_thd; /* thd that we're running SHOW EXPLAIN for */
THD *request_thd; /* thd that run SHOW EXPLAIN command */
/* If true, there was some error when producing EXPLAIN output. */
bool failed_to_produce;
/* SHOW EXPLAIN will be stored here */
select_result_explain_buffer *explain_buf;
/* Query that we've got SHOW EXPLAIN for */
String query_str;
/* Overloaded virtual function */
void call_in_target_thread();
};
class THD;
void mysqld_show_explain(THD *thd, const char *calling_user, ulong thread_id);
#ifndef DBUG_OFF
void dbug_serve_apcs(THD *thd, int n_calls);
#endif
@ -2222,6 +2190,7 @@ public:
*/
killed_state volatile killed;
/* See also thd_killed() */
inline bool check_killed()
{
if (killed)
@ -2438,7 +2407,8 @@ public:
Allows this thread to serve as a target for others to schedule Async
Procedure Calls on.
It's possible to schedule arbitrary C++ function calls. Currently, only
It's possible to schedule any code to be executed this way, by
inheriting from the Apc_call object. Currently, only
Show_explain_request uses this.
*/
Apc_target apc_target;