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MDEV-7648: Extra data in ANALYZE FORMAT=JSON $stmt

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Show total execution time (r_total_time_ms) for various parts of the
query:
1. time spent in SELECTs
2. time spent reading rows from storage engines

#2 currently gets the data from P_S.
This commit is contained in:
Sergei Petrunia
2015-03-07 22:47:28 +03:00
parent 2288b84df4
commit 1626e0d3d4
12 changed files with 218 additions and 3 deletions
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47
sql/sql_explain.cc
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@ -732,7 +732,12 @@ void Explain_select::print_explain_json(Explain_query *query,
*/
writer->add_member("query_block").start_object();
writer->add_member("select_id").add_ll(select_id);
if (is_analyze && time_tracker.get_loops())
{
writer->add_member("r_loops").add_ll(time_tracker.get_loops());
writer->add_member("r_total_time_ms").add_double(time_tracker.get_time_ms());
}
if (exec_const_cond)
{
writer->add_member("const_condition");
@ -1289,6 +1294,9 @@ void Explain_table_access::print_explain_json(Explain_query *query,
}
else
writer->add_null();
op_tracker.end_tracking();
op_tracker.print_json(writer);
}
/* `filtered` */
@ -1971,3 +1979,40 @@ void create_explain_query_if_not_exists(LEX *lex, MEM_ROOT *mem_root)
create_explain_query(lex, mem_root);
}
//////////////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////////////
void Table_op_tracker::start_tracking(TABLE *table)
{
//TODO: will this compile without P_S ?
start_count= end_count= 0;
if ((psi_table= table->file->m_psi))
{
PSI_CALL_get_table_current_stats(psi_table, &start_count, &start_sum);
}
}
void Table_op_tracker::end_tracking()
{
if (psi_table)
{
PSI_CALL_get_table_current_stats(psi_table, &end_count, &end_sum);
}
}
void Table_op_tracker::print_json(Json_writer *writer)
{
if (start_count != end_count)
{
/*
We have time in picoseconds, we want to print in milli-seconds
picosecond is sec* 10^ -12
millisecond is sec * 10^-3
*/
double ms= double(end_sum - start_sum) / 1e9;
writer->add_member("r_total_time_ms").add_double(ms);
}
}