database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-27 18:02:13 +03:00
Code Activity

EXPLAIN FORMAT=JSON: support derived tables

Browse Source
This commit is contained in:
Sergei Petrunia
2014-11-28 22:23:29 +03:00
parent 3a5e080d4d
commit 2ac3b39e68
6 changed files with 141 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
sql/sql_explain.cc
View File

@ -558,18 +558,29 @@ void Explain_node::print_explain_json_for_children(Explain_query *query,
Json_writer *writer,
bool is_analyze)
{
if (!children.elements())
return;
writer->add_member("subqueries").start_array();
Json_writer_nesting_guard guard(writer);
bool started= false;
for (int i= 0; i < (int) children.elements(); i++)
{
writer->start_object();
Explain_node *node= query->get_node(children.at(i));
/* Derived tables are printed inside Explain_table_access objects */
if (node->is_derived_table)
continue;
if (!started)
{
writer->add_member("subqueries").start_array();
started= true;
}
writer->start_object();
node->print_explain_json(query, writer, is_analyze);
writer->end_object();
}
writer->end_array();
if (started)
writer->end_array();
}
@ -665,7 +676,7 @@ void Explain_select::print_explain_json(Explain_query *query,
for (uint i=0; i< n_join_tabs; i++)
{
// psergey-todo: Need to honor SJM nests...
join_tabs[i]->print_explain_json(writer, is_analyze);
join_tabs[i]->print_explain_json(query, writer, is_analyze);
}
}
@ -1054,7 +1065,8 @@ void Explain_table_access::tag_to_json(Json_writer *writer, enum explain_extra_t
}
void Explain_table_access::print_explain_json(Json_writer *writer,
void Explain_table_access::print_explain_json(Explain_query *query,
Json_writer *writer,
bool is_analyze)
{
Json_writer_nesting_guard guard(writer);
@ -1169,6 +1181,15 @@ void Explain_table_access::print_explain_json(Json_writer *writer,
}
}
if (derived_select_number)
{
/* This is a derived table. Print its contents here */
writer->add_member("materialized").start_object();
Explain_node *node= query->get_node(derived_select_number);
node->print_explain_json(query, writer, is_analyze);
writer->end_object();
}
writer->end_object();
}