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MDEV-3798: EXPLAIN UPDATE/DELETE

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- Address review feedback: rename nearly any name used by the new EXPLAIN code.
This commit is contained in:
Sergey Petrunya
2013-10-05 09:58:22 +04:00
parent f5fba6564b
commit fedf769f0b
19 changed files with 273 additions and 289 deletions
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101
sql/sql_select.cc
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@@ -2305,9 +2305,8 @@ void join_save_qpf(JOIN *join)
join->have_query_plan != JOIN::QEP_NOT_PRESENT_YET &&
join->have_query_plan != JOIN::QEP_DELETED && // this happens when there was no QEP ever, but then
//cleanup() is called multiple times
thd->lex->query_plan_footprint && // for "SET" command in SPs.
!thd->lex->query_plan_footprint->get_select(join->select_lex->select_number))
thd->lex->explain && // for "SET" command in SPs.
!thd->lex->explain->get_select(join->select_lex->select_number))
{
const char *message= NULL;
@@ -2317,12 +2316,12 @@ void join_save_qpf(JOIN *join)
message= join->zero_result_cause ? join->zero_result_cause : "No tables used";
}
join->save_qpf(thd->lex->query_plan_footprint,
join->need_tmp, // need_tmp_table
!join->skip_sort_order && !join->no_order &&
(join->order || join->group_list), // bool need_order
join->select_distinct, // bool distinct
message); // message
join->save_explain_data(thd->lex->explain,
join->need_tmp,
!join->skip_sort_order && !join->no_order &&
(join->order || join->group_list),
join->select_distinct,
message);
}
}
@@ -2347,34 +2346,29 @@ void JOIN::exec()
exec_inner();
if (!exec_qpf_saved)
if (!exec_saved_explain)
{
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 &&
have_query_plan != QEP_DELETED && // this happens when there was no QEP ever, but then
//cleanup() is called multiple times
thd->lex->query_plan_footprint //&& // for "SET" command in SPs.
/*!thd->lex->query_plan_footprint->get_select(select_lex->select_number)*/)
thd->lex->explain)// for "SET" command in SPs.
{
const char *message= NULL;
if (!table_count || !tables_list || zero_result_cause)
{
/* It's a degenerate join */
message= zero_result_cause ? zero_result_cause : "No tables used";
}
save_qpf(thd->lex->query_plan_footprint,
need_tmp, // need_tmp_table
// !skip_sort_order && !no_order &&
// (order || group_list), // bool need_order
order != 0 && !skip_sort_order,
select_distinct, // bool distinct
message); // message
save_explain_data(thd->lex->explain,
need_tmp,
order != 0 && !skip_sort_order,
select_distinct,
message);
}
exec_qpf_saved= true;
exec_saved_explain= true;
}
DBUG_EXECUTE_IF("show_explain_probe_join_exec_end",
@@ -11170,37 +11164,7 @@ void JOIN::cleanup(bool full)
DBUG_PRINT("enter", ("full %u", (uint) full));
if (full)
{
/* Save it again */
#if 0
psergey-todo: remove?
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 &&
have_query_plan != QEP_DELETED && // this happens when there was no QEP ever, but then
//cleanup() is called multiple times
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;
if (!table_count || !tables_list || zero_result_cause)
{
/* It's a degenerate join */
message= zero_result_cause ? zero_result_cause : "No tables used";
}
save_qpf(thd->lex->query_plan_footprint,
need_tmp, // need_tmp_table
!skip_sort_order && !no_order &&
(order || group_list), // bool need_order
select_distinct, // bool distinct
message); // message
}
#endif
have_query_plan= QEP_DELETED; //psergey: this is a problem!
}
have_query_plan= QEP_DELETED;
if (table)
{
@@ -22522,16 +22486,17 @@ void append_possible_keys(String *str, TABLE *table, key_map possible_keys)
Currently, this function may be called multiple times
*/
int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
bool distinct, const char *message)
int JOIN::save_explain_data(Explain_query *output, bool need_tmp_table,
bool need_order, bool distinct,
const char *message)
{
QPF_node *qp_node;
Explain_node *qp_node;
JOIN *join= this; /* Legacy: this code used to be a non-member function */
THD *thd=join->thd;
const CHARSET_INFO *cs= system_charset_info;
int quick_type;
int error= 0;
DBUG_ENTER("JOIN::save_qpf");
DBUG_ENTER("JOIN::save_explain_data");
DBUG_PRINT("info", ("Select 0x%lx, type %s, message %s",
(ulong)join->select_lex, join->select_lex->type,
message ? message : "NULL"));
@@ -22540,8 +22505,8 @@ 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 (output->mem_root) QPF_select;
Explain_select *qp_sel;
qp_node= qp_sel= new (output->mem_root) Explain_select;
join->select_lex->set_explain_type(true);
qp_sel->select_id= join->select_lex->select_number;
@@ -22552,13 +22517,13 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
}
else if (join->select_lex == join->unit->fake_select_lex)
{
/* Do nothing, QPF_union will create and print fake_select_lex */
/* Do nothing, Explain_union will create and print fake_select_lex */
}
else if (!join->select_lex->master_unit()->derived ||
join->select_lex->master_unit()->derived->is_materialized_derived())
{
QPF_select *qp_sel;
qp_node= qp_sel= new (output->mem_root) QPF_select;
Explain_select *qp_sel;
qp_node= qp_sel= new (output->mem_root) Explain_select;
table_map used_tables=0;
join->select_lex->set_explain_type(true);
@@ -22606,7 +22571,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
tab= pre_sort_join_tab;
}
QPF_table_access *qpt= new (output->mem_root) QPF_table_access;
Explain_table_access *qpt= new (output->mem_root) Explain_table_access;
qp_sel->add_table(qpt);
qpt->key.set(thd->mem_root, NULL, (uint)-1);
qpt->quick_info= NULL;
@@ -22701,7 +22666,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
*/
if (tab->select && tab->select->quick && tab_type != JT_CONST)
{
qpt->quick_info= new QPF_quick_select;
qpt->quick_info= new Explain_quick_select;
tab->select->quick->save_info(thd->mem_root, qpt->quick_info);
}
@@ -22981,7 +22946,7 @@ int JOIN::save_qpf(QPF_query *output, bool need_tmp_table, bool need_order,
if (tab->cache)
{
qpt->push_extra(ET_USING_JOIN_BUFFER);
tab->cache->save_qpf(&qpt->bka_type);
tab->cache->save_explain_data(&qpt->bka_type);
}
}
@@ -23039,9 +23004,9 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
DBUG_ENTER("select_describe");
/* Update the QPF with latest values of using_temporary, using_filesort */
QPF_select *qp;
Explain_select *qp;
uint select_nr= join->select_lex->select_number;
if ((qp= thd->lex->query_plan_footprint->get_select(select_nr)))
if ((qp= thd->lex->explain->get_select(select_nr)))
{
qp->using_temporary= need_tmp_table;
qp->using_filesort= need_order;
@@ -23095,7 +23060,7 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
if (unit->is_union())
{
unit->fake_select_lex->select_number= UINT_MAX; // jost for initialization
unit->fake_select_lex->select_number= FAKE_SELECT_LEX_ID; // jost for initialization
unit->fake_select_lex->type= "UNION RESULT";
unit->fake_select_lex->options|= SELECT_DESCRIBE;
if (!(res= unit->prepare(thd, result, SELECT_NO_UNLOCK | SELECT_DESCRIBE)))