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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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110
sql/sql_explain.cc
View File

@ -140,7 +140,7 @@ int Explain_query::send_explain(THD *thd)
return 1;
int res;
if ((res= print_explain(result, lex->describe)))
if ((res= print_explain(result, lex->describe, lex->analyze_stmt)))
result->abort_result_set();
else
result->send_eof();
@ -154,16 +154,16 @@ int Explain_query::send_explain(THD *thd)
*/
int Explain_query::print_explain(select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags, bool is_analyze)
{
if (upd_del_plan)
{
upd_del_plan->print_explain(this, output, explain_flags);
upd_del_plan->print_explain(this, output, explain_flags, is_analyze);
return 0;
}
else if (insert_plan)
{
insert_plan->print_explain(this, output, explain_flags);
insert_plan->print_explain(this, output, explain_flags, is_analyze);
return 0;
}
else
@ -172,14 +172,14 @@ int Explain_query::print_explain(select_result_sink *output,
Explain_node *node= get_node(1);
if (!node)
return 1; /* No query plan */
return node->print_explain(this, output, explain_flags);
return node->print_explain(this, output, explain_flags, is_analyze);
}
}
bool print_explain_query(LEX *lex, THD *thd, String *str)
{
return lex->explain->print_explain_str(thd, str);
return lex->explain->print_explain_str(thd, str, false);
}
@ -187,14 +187,14 @@ bool print_explain_query(LEX *lex, THD *thd, String *str)
Return tabular EXPLAIN output as a text string
*/
bool Explain_query::print_explain_str(THD *thd, String *out_str)
bool Explain_query::print_explain_str(THD *thd, String *out_str, bool is_analyze)
{
List<Item> fields;
thd->make_explain_field_list(fields);
select_result_text_buffer output_buf(thd);
output_buf.send_result_set_metadata(fields, thd->lex->describe);
if (print_explain(&output_buf, thd->lex->describe))
if (print_explain(&output_buf, thd->lex->describe, is_analyze))
return true;
output_buf.save_to(out_str);
return false;
@ -217,7 +217,8 @@ static void push_string(List<Item> *item_list, String *str)
int Explain_union::print_explain(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags,
bool is_analyze)
{
char table_name_buffer[SAFE_NAME_LEN];
@ -225,7 +226,7 @@ int Explain_union::print_explain(Explain_query *query,
for (int i= 0; i < (int) union_members.elements(); i++)
{
Explain_select *sel= query->get_select(union_members.at(i));
sel->print_explain(query, output, explain_flags);
sel->print_explain(query, output, explain_flags, is_analyze);
}
/* Print a line with "UNION RESULT" */
@ -287,9 +288,17 @@ int Explain_union::print_explain(Explain_query *query,
/* `rows` */
item_list.push_back(item_null);
/* `r_rows` */
if (is_analyze)
item_list.push_back(item_null);
/* `filtered` */
if (explain_flags & DESCRIBE_EXTENDED)
if (explain_flags & DESCRIBE_EXTENDED || is_analyze)
item_list.push_back(item_null);
/* `r_filtered` */
if (is_analyze)
item_list.push_back(item_null);
/* `Extra` */
@ -309,7 +318,7 @@ int Explain_union::print_explain(Explain_query *query,
Print all subquery children (UNION children have already been printed at
the start of this function)
*/
return print_explain_for_children(query, output, explain_flags);
return print_explain_for_children(query, output, explain_flags, is_analyze);
}
@ -319,12 +328,13 @@ int Explain_union::print_explain(Explain_query *query,
int Explain_node::print_explain_for_children(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags,
bool is_analyze)
{
for (int i= 0; i < (int) children.elements(); i++)
{
Explain_node *node= query->get_node(children.at(i));
if (node->print_explain(query, output, explain_flags))
if (node->print_explain(query, output, explain_flags, is_analyze))
return 1;
}
return 0;
@ -344,7 +354,7 @@ Explain_select::~Explain_select()
int Explain_select::print_explain(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags, bool is_analyze)
{
if (message)
{
@ -359,8 +369,17 @@ int Explain_select::print_explain(Explain_query *query,
item_list.push_back(item_null);
if (explain_flags & DESCRIBE_PARTITIONS)
item_list.push_back(item_null);
if (explain_flags & DESCRIBE_EXTENDED)
/* filtered */
if (is_analyze || explain_flags & DESCRIBE_EXTENDED)
item_list.push_back(item_null);
if (is_analyze)
{
/* r_rows, r_filtered */
item_list.push_back(item_null);
item_list.push_back(item_null);
}
item_list.push_back(new Item_string(message,strlen(message),cs));
@ -373,7 +392,7 @@ int Explain_select::print_explain(Explain_query *query,
bool using_fs= using_filesort;
for (uint i=0; i< n_join_tabs; i++)
{
join_tabs[i]->print_explain(output, explain_flags, select_id,
join_tabs[i]->print_explain(output, explain_flags, is_analyze, select_id,
select_type, using_tmp, using_fs);
if (i == 0)
{
@ -387,7 +406,7 @@ int Explain_select::print_explain(Explain_query *query,
}
}
return print_explain_for_children(query, output, explain_flags);
return print_explain_for_children(query, output, explain_flags, is_analyze);
}
@ -398,8 +417,9 @@ void Explain_table_access::push_extra(enum explain_extra_tag extra_tag)
int Explain_table_access::print_explain(select_result_sink *output, uint8 explain_flags,
uint select_id, const char *select_type,
bool using_temporary, bool using_filesort)
bool is_analyze,
uint select_id, const char *select_type,
bool using_temporary, bool using_filesort)
{
const CHARSET_INFO *cs= system_charset_info;
const char *hash_key_prefix= "#hash#";
@ -519,8 +539,16 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
else
item_list.push_back(item_null);
/* `r_rows` */
if (is_analyze)
{
ha_rows avg_rows= r_scans ? round((double) r_rows / r_scans): 0;
item_list.push_back(new Item_int((longlong) (ulonglong) avg_rows,
MY_INT64_NUM_DECIMAL_DIGITS));
}
/* `filtered` */
if (explain_flags & DESCRIBE_EXTENDED)
if (explain_flags & DESCRIBE_EXTENDED || is_analyze)
{
if (filtered_set)
{
@ -530,6 +558,17 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
item_list.push_back(item_null);
}
/* `r_filtered` */
if (is_analyze)
{
double r_filtered;
if (r_rows > 0)
r_filtered= 100.0 * (double)r_rows_after_table_cond / r_rows;
else
r_filtered= 100.0;
item_list.push_back(new Item_float(r_filtered, 2));
}
/* `Extra` */
StringBuffer<256> extra_buf;
bool first= true;
@ -802,12 +841,13 @@ void Explain_quick_select::print_key_len(String *str)
int Explain_delete::print_explain(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags,
bool is_analyze)
{
if (deleting_all_rows)
{
const char *msg= "Deleting all rows";
int res= print_explain_message_line(output, explain_flags,
int res= print_explain_message_line(output, explain_flags, is_analyze,
1 /*select number*/,
select_type, &rows, msg);
return res;
@ -815,14 +855,16 @@ int Explain_delete::print_explain(Explain_query *query,
}
else
{
return Explain_update::print_explain(query, output, explain_flags);
return Explain_update::print_explain(query, output, explain_flags,
is_analyze);
}
}
int Explain_update::print_explain(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags,
bool is_analyze)
{
StringBuffer<64> key_buf;
StringBuffer<64> key_len_buf;
@ -832,7 +874,7 @@ int Explain_update::print_explain(Explain_query *query,
const char *msg= impossible_where ?
"Impossible WHERE" :
"No matching rows after partition pruning";
int res= print_explain_message_line(output, explain_flags,
int res= print_explain_message_line(output, explain_flags, is_analyze,
1 /*select number*/,
select_type,
NULL, /* rows */
@ -892,8 +934,9 @@ int Explain_update::print_explain(Explain_query *query,
Single-table DELETE commands do not do "Using temporary".
"Using index condition" is also not possible (which is an unjustified limitation)
*/
double r_filtered= 100 * (r_rows?((double)r_rows_after_where/r_rows):1.0);
print_explain_row(output, explain_flags,
print_explain_row(output, explain_flags, is_analyze,
1, /* id */
select_type,
table_name.c_ptr(),
@ -904,18 +947,21 @@ int Explain_update::print_explain(Explain_query *query,
key_len_buf.length() ? key_len_buf.c_ptr() : NULL,
NULL, /* 'ref' is always NULL in single-table EXPLAIN DELETE */
&rows,
&r_rows,
r_filtered,
extra_str.c_ptr_safe());
return print_explain_for_children(query, output, explain_flags);
return print_explain_for_children(query, output, explain_flags, is_analyze);
}
int Explain_insert::print_explain(Explain_query *query,
select_result_sink *output,
uint8 explain_flags)
uint8 explain_flags,
bool is_analyze)
{
const char *select_type="INSERT";
print_explain_row(output, explain_flags,
print_explain_row(output, explain_flags, is_analyze,
1, /* id */
select_type,
table_name.c_ptr(),
@ -926,9 +972,11 @@ int Explain_insert::print_explain(Explain_query *query,
NULL, // key_len
NULL, // ref
NULL, // rows
NULL, // r_rows
100.0, // r_filtered
NULL);
return print_explain_for_children(query, output, explain_flags);
return print_explain_for_children(query, output, explain_flags, is_analyze);
}