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MDEV-7811: EXPLAIN/ANALYZE FORMAT=JSON should show subquery cache

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This commit is contained in:
Oleksandr Byelkin
2015-03-25 18:27:10 +01:00
committed by Sergei Petrunia
parent 498a264d19
commit c6aee27b73
11 changed files with 401 additions and 9 deletions
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30
sql/sql_explain.cc
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@ -23,6 +23,7 @@
#include "sql_select.h"
#include "my_json_writer.h"
#include "opt_range.h"
#include "sql_expression_cache.h"
const char * STR_DELETING_ALL_ROWS= "Deleting all rows";
const char * STR_IMPOSSIBLE_WHERE= "Impossible WHERE";
@ -543,6 +544,7 @@ void Explain_union::print_explain_json(Explain_query *query,
writer->add_null();
}
print_explain_json_cache(writer, is_analyze);
writer->add_member("query_specifications").start_array();
for (int i= 0; i < (int) union_members.elements(); i++)
@ -640,6 +642,30 @@ void Explain_node::print_explain_json_for_children(Explain_query *query,
}
void Explain_node::print_explain_json_cache(Json_writer *writer,
bool is_analyze)
{
if (cache_stat)
{
cache_stat->flush_stat();
writer->add_member("expression_cache").start_object();
writer->add_member("state").
add_str(Expression_cache_stat::state_str[cache_stat->state]);
if (is_analyze)
{
writer->add_member("r_hit").add_ll(cache_stat->hit);
writer->add_member("r_miss").add_ll(cache_stat->miss);
writer->add_member("r_loops").add_ll(cache_stat->hit +
cache_stat->miss);
writer->add_member("r_hit_ratio").add_ll(((double)cache_stat->hit)/
((double)(cache_stat->hit +
cache_stat->miss)) * 100.0);
}
writer->end_object();
}
}
void Explain_select::replace_table(uint idx, Explain_table_access *new_tab)
{
delete join_tabs[idx];
@ -757,17 +783,19 @@ 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");
write_item(writer, exec_const_cond);
}
print_explain_json_cache(writer, is_analyze);
Filesort_tracker *first_table_sort= NULL;
bool first_table_sort_used= false;