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[SHOW] EXPLAIN UPDATE/DELETE, code re-structuring

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- Handle statements inside SPs:
  = regular statements
  = SET command, which does not have its own statement.

- Handle execution of subquery from range optimizer: 
  allocate subquery QPFs on the same MEM_ROOT as the whole 
  query plan was allocated.
This commit is contained in:
Sergey Petrunya
2013-06-21 13:26:53 +04:00
parent ab4a13b2b9
commit af5e128e50
8 changed files with 33 additions and 22 deletions
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15
sql/opt_qpf.cc
View File

@ -559,8 +559,19 @@ int QPF_update::print_explain(QPF_query *query, select_result_sink *output,
return print_explain_for_children(query, output, explain_flags);
}
void delete_qpf_query(QPF_query * query)
void delete_qpf_query(LEX *lex)
{
delete query;
delete lex->query_plan_footprint;
lex->query_plan_footprint= NULL;
}
void create_qpf_query(LEX *lex, MEM_ROOT *mem_root)
{
DBUG_ASSERT(!lex->query_plan_footprint);
lex->query_plan_footprint= new QPF_query;
DBUG_ASSERT(mem_root == current_thd->mem_root);
lex->query_plan_footprint->mem_root= mem_root;
}

2
sql/opt_qpf.h
View File

@ -214,6 +214,8 @@ public:
/* Produce a tabular EXPLAIN output */
int print_explain(select_result_sink *output, uint8 explain_flags);
MEM_ROOT *mem_root;
private:
QPF_union *unions[MAX_TABLES];
QPF_select *selects[MAX_TABLES];

6
sql/sp_head.cc
View File

@ -2973,6 +2973,7 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
}
reinit_stmt_before_use(thd, m_lex);
// not here, but inside every instr: create_qpf_query(m_lex);
if (open_tables)
res= instr->exec_open_and_lock_tables(thd, m_lex->query_tables);
@ -3007,8 +3008,7 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
thd->mdl_context.release_statement_locks();
}
delete_qpf_query(m_lex->query_plan_footprint);
m_lex->query_plan_footprint= NULL;
delete_qpf_query(m_lex);
if (m_lex->query_tables_own_last)
{
@ -3212,6 +3212,7 @@ sp_instr_set::execute(THD *thd, uint *nextp)
int
sp_instr_set::exec_core(THD *thd, uint *nextp)
{
create_qpf_query(thd->lex, thd->mem_root);
int res= thd->spcont->set_variable(thd, m_offset, &m_value);
if (res)
@ -3224,6 +3225,7 @@ sp_instr_set::exec_core(THD *thd, uint *nextp)
my_error(ER_OUT_OF_RESOURCES, MYF(ME_FATALERROR));
}
}
delete_qpf_query(thd->lex);
*nextp = m_ip+1;
return res;

6
sql/sql_lex.cc
View File

@ -4251,7 +4251,7 @@ void st_select_lex::save_qpf(QPF_query *output)
msg= "Query plan already deleted";
}
set_explain_type(TRUE/* on_the_fly */);
QPF_select *qp_sel= new QPF_select;
QPF_select *qp_sel= new (output->mem_root) QPF_select;
qp_sel->select_id= select_number;
qp_sel->select_type= type;
qp_sel->message= msg;
@ -4346,7 +4346,7 @@ int st_select_lex_unit::save_qpf(QPF_query *output)
return 0;
}
QPF_union *qpfu= new QPF_union;
QPF_union *qpfu= new (output->mem_root) QPF_union;
/*
TODO: The following code should be eliminated. If we have a capability to
save Query Plan Footprints, we should just save them, and never need to
@ -4361,7 +4361,7 @@ int st_select_lex_unit::save_qpf(QPF_query *output)
const char *msg="Query plan already deleted";
first->set_explain_type(TRUE/* on_the_fly */);
QPF_select *qp_sel= new QPF_select;
QPF_select *qp_sel= new (output->mem_root)QPF_select;
qp_sel->select_id= first->select_number;
qp_sel->select_type= first->type;
qp_sel->message= msg;

3
sql/sql_lex.h
View File

@ -619,7 +619,8 @@ class select_union;
class Procedure;
class QPF_query;
void delete_qpf_query(QPF_query * query);
void delete_qpf_query(LEX *lex);
void create_qpf_query(LEX *lex, MEM_ROOT *mem_root);
class st_select_lex_unit: public st_select_lex_node {
protected:

11
sql/sql_parse.cc
View File

@ -598,10 +598,7 @@ static void handle_bootstrap_impl(THD *thd)
#if defined(ENABLED_PROFILING)
thd->profiling.finish_current_query();
#endif
//
delete thd->lex->query_plan_footprint;
thd->lex->query_plan_footprint= NULL;
//
delete_qpf_query(thd->lex);
if (bootstrap_error)
break;
@ -1523,8 +1520,7 @@ void log_slow_statement(THD *thd)
{
DBUG_ENTER("log_slow_statement");
delete thd->lex->query_plan_footprint;
thd->lex->query_plan_footprint= NULL;
delete_qpf_query(thd->lex);
/*
The following should never be true with our current code base,
@ -2188,8 +2184,7 @@ mysql_execute_command(THD *thd)
thd->mdl_context.release_transactional_locks();
}
DBUG_ASSERT(!thd->lex->query_plan_footprint);
thd->lex->query_plan_footprint= new QPF_query;
create_qpf_query(thd->lex, thd->mem_root);
#ifndef DBUG_OFF
if (lex->sql_command != SQLCOM_SET_OPTION)

3
sql/sql_prepare.cc
View File

@ -3927,8 +3927,7 @@ bool Prepared_statement::execute(String *expanded_query, bool open_cursor)
if (! cursor)
cleanup_stmt();
//psergey: TODO the "EXECUTE problem" is here
delete_qpf_query(thd->lex->query_plan_footprint);
thd->lex->query_plan_footprint= NULL;
delete_qpf_query(thd->lex);
thd->set_statement(&stmt_backup);
thd->stmt_arena= old_stmt_arena;

9
sql/sql_select.cc
View File

@ -11112,6 +11112,7 @@ void JOIN::cleanup(bool full)
if (select_lex->select_number != UINT_MAX &&
select_lex->select_number != INT_MAX /* this is not a UNION's "fake select */ &&
have_query_plan != QEP_NOT_PRESENT_YET &&
thd->lex->query_plan_footprint && // for "SET" command in SPs.
!thd->lex->query_plan_footprint->get_select(select_lex->select_number))
{
const char *message= NULL;
@ -22986,7 +22987,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
if (message)
{
QPF_select *qp_sel;
qp_node= qp_sel= new QPF_select;
qp_node= qp_sel= new (output->mem_root) QPF_select;
join->select_lex->set_explain_type(on_the_fly);
qp_sel->select_id= join->select_lex->select_number;
@ -22998,7 +22999,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
else if (join->select_lex == join->unit->fake_select_lex)
{
select_lex->set_explain_type(on_the_fly);
QPF_union *qp_union= new QPF_union;
QPF_union *qp_union= new (output->mem_root) QPF_union;
qp_node= qp_union;
SELECT_LEX *child;
@ -23018,7 +23019,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
join->select_lex->master_unit()->derived->is_materialized_derived())
{
QPF_select *qp_sel;
qp_node= qp_sel= new QPF_select;
qp_node= qp_sel= new (output->mem_root) QPF_select;
table_map used_tables=0;
if (on_the_fly)
@ -23077,7 +23078,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
tab= pre_sort_join_tab;
}
QPF_table_access *qpt= new QPF_table_access;
QPF_table_access *qpt= new (output->mem_root) QPF_table_access;
qp_sel->add_table(qpt);
/* id */