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MDEV-406: ANALYZE $stmt
- Ported the old patch to new explain code
- New SQL syntax (ANALYZE $stmt)
- ANALYZE UPDATE/DELETE is now supported (because EXPLAIN UPDATE/DELETE is supported)
- Basic counters are calculated for basic kinds of queries
  (still need to see what happens with join buffer, ORDER BY...LIMIT queries, etc)
This commit is contained in:
Sergei Petrunia
2014-05-27 20:13:17 +04:00
parent 5a61516afd
commit eaba1ba4a5
13 changed files with 239 additions and 58 deletions
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34
sql/sql_select.cc
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@ -17532,6 +17532,8 @@ sub_select(JOIN *join,JOIN_TAB *join_tab,bool end_of_records)
(*join_tab->next_select)(join,join_tab+1,end_of_records);
DBUG_RETURN(nls);
}
join_tab->explain->r_scans++;
int error;
enum_nested_loop_state rc= NESTED_LOOP_OK;
READ_RECORD *info= &join_tab->read_record;
@ -17667,6 +17669,8 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
DBUG_RETURN(NESTED_LOOP_KILLED); /* purecov: inspected */
}
join_tab->explain->r_rows++;
if (join_tab->table->vfield)
update_virtual_fields(join->thd, join_tab->table);
@ -17685,6 +17689,7 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
There is no select condition or the attached pushed down
condition is true => a match is found.
*/
join_tab->explain->r_rows_after_table_cond++;
bool found= 1;
while (join_tab->first_unmatched && found)
{
@ -22908,10 +22913,11 @@ void JOIN::clear()
/*
Print an EXPLAIN line with all NULLs and given message in the 'Extra' column
TODO: is_analyze
*/
int print_explain_message_line(select_result_sink *result,
uint8 options,
uint8 options, bool is_analyze,
uint select_number,
const char *select_type,
ha_rows *rows,
@ -22944,8 +22950,16 @@ int print_explain_message_line(select_result_sink *result,
else
item_list.push_back(item_null);
/* `r_rows` */
if (is_analyze)
item_list.push_back(item_null);
/* `filtered` */
if (options & DESCRIBE_EXTENDED)
if (is_analyze || options & DESCRIBE_EXTENDED)
item_list.push_back(item_null);
/* `r_filtered` */
if (is_analyze)
item_list.push_back(item_null);
/* `Extra` */
@ -22996,7 +23010,7 @@ void make_possible_keys_line(TABLE *table, key_map possible_keys, String *line)
*/
int print_explain_row(select_result_sink *result,
uint8 options,
uint8 options, bool is_analyze,
uint select_number,
const char *select_type,
const char *table_name,
@ -23007,6 +23021,8 @@ int print_explain_row(select_result_sink *result,
const char *key_len,
const char *ref,
ha_rows *rows,
ha_rows *r_rows,
double r_filtered,
const char *extra)
{
const CHARSET_INFO *cs= system_charset_info;
@ -23058,12 +23074,20 @@ int print_explain_row(select_result_sink *result,
}
else
item_list.push_back(item_null);
/* 'r_rows' */
if (is_analyze)
item_list.push_back(item_null);
/* 'filtered' */
const double filtered=100.0;
if (options & DESCRIBE_EXTENDED)
if (options & DESCRIBE_EXTENDED || is_analyze)
item_list.push_back(new Item_float(filtered, 2));
/* 'r_filtered' */
if (is_analyze)
item_list.push_back(new Item_float(r_filtered, 2));
/* 'Extra' */
if (extra)
item_list.push_back(new Item_string(extra, strlen(extra), cs));
@ -23291,6 +23315,8 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
eta->key.set(thd->mem_root, NULL, (uint)-1);
eta->quick_info= NULL;
tab->explain= eta;
/* id */
if (tab->bush_root_tab)
eta->sjm_nest_select_id= select_id;