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EXPLAIN FORMAT=JSON: Add support for non-merged semi-joins

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This commit is contained in:
Sergei Petrunia
2014-11-29 01:08:18 +03:00
parent 2ac3b39e68
commit 0b5d989c89
7 changed files with 117 additions and 7 deletions
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26
sql/sql_explain.cc
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@ -554,6 +554,19 @@ int Explain_node::print_explain_for_children(Explain_query *query,
}
/*
This tells whether a child subquery should be printed in JSON output.
Derived tables and Non-merged semi-joins should not be printed, because they
are printed inline in Explain_table_access.
*/
bool is_connection_printable_in_json(enum Explain_node::explain_connection_type type)
{
return (type != Explain_node::EXPLAIN_NODE_DERIVED &&
type != Explain_node::EXPLAIN_NODE_NON_MERGED_SJ);
}
void Explain_node::print_explain_json_for_children(Explain_query *query,
Json_writer *writer,
bool is_analyze)
@ -565,7 +578,8 @@ void Explain_node::print_explain_json_for_children(Explain_query *query,
{
Explain_node *node= query->get_node(children.at(i));
/* Derived tables are printed inside Explain_table_access objects */
if (node->is_derived_table)
if (!is_connection_printable_in_json(node->connection_type))
continue;
if (!started)
@ -1189,6 +1203,16 @@ void Explain_table_access::print_explain_json(Explain_query *query,
node->print_explain_json(query, writer, is_analyze);
writer->end_object();
}
if (non_merged_sjm_number)
{
/* This is a non-merged semi-join table. Print its contents here */
writer->add_member("materialized").start_object();
writer->add_member("unique").add_ll(1);
Explain_node *node= query->get_node(non_merged_sjm_number);
node->connection_type= Explain_node::EXPLAIN_NODE_NON_MERGED_SJ;
node->print_explain_json(query, writer, is_analyze);
writer->end_object();
}
writer->end_object();
}