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EXPLAIN FORMAT=JSON: Support "range checked for each record"

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This commit is contained in:
Sergei Petrunia
2014-12-06 02:23:37 +03:00
parent 9cac7649ea
commit a80a797686
5 changed files with 82 additions and 15 deletions
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42
sql/sql_explain.cc
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@ -1132,6 +1132,8 @@ void Explain_table_access::tag_to_json(Json_writer *writer, enum explain_extra_t
case ET_USING:
// index merge: case ET_USING
break;
case ET_RANGE_CHECKED_FOR_EACH_RECORD:
/* Handled as range_checked_fer */
case ET_USING_JOIN_BUFFER:
/* Do nothing. Join buffer is handled differently */
case ET_START_TEMPORARY:
@ -1153,6 +1155,22 @@ void Explain_table_access::tag_to_json(Json_writer *writer, enum explain_extra_t
}
static
void add_json_keyset(Json_writer *writer, const char *elem_name,
String_list *keyset)
{
if (!keyset->is_empty())
{
List_iterator_fast<char> it(*keyset);
const char *name;
writer->add_member(elem_name).start_array();
while ((name= it++))
writer->add_str(name);
writer->end_array();
}
}
void Explain_table_access::print_explain_json(Explain_query *query,
Json_writer *writer,
bool is_analyze)
@ -1164,20 +1182,19 @@ void Explain_table_access::print_explain_json(Explain_query *query,
writer->add_member("block-nl-join").start_object();
}
if (range_checked_fer)
{
writer->add_member("range-checked-for-each-record").start_object();
add_json_keyset(writer, "keys", &possible_keys);
}
writer->add_member("table").start_object();
writer->add_member("table_name").add_str(table_name);
// partitions
writer->add_member("access_type").add_str(join_type_str[type]);
if (!possible_keys.is_empty())
{
List_iterator_fast<char> it(possible_keys);
const char *name;
writer->add_member("possible_keys").start_array();
while ((name= it++))
writer->add_str(name);
writer->end_array();
}
add_json_keyset(writer, "possible_keys", &possible_keys);
/* `key` */
/* For non-basic quick select, 'key' will not be present */
@ -1271,10 +1288,13 @@ void Explain_table_access::print_explain_json(Explain_query *query,
{
tag_to_json(writer, extra_tags.at(i));
}
if (range_checked_fer)
writer->end_object(); // "range-checked-for-each-record"
if (bka_type.is_using_jbuf())
{
writer->end_object();
writer->end_object(); // "block-nl-join"
writer->add_member("buffer_type").add_str(bka_type.incremental?
"incremental":"flat");
writer->add_member("join_type").add_str(bka_type.join_alg);
@ -1388,7 +1408,7 @@ void Explain_table_access::append_tag_name(String *str, enum explain_extra_tag t
char buf[MAX_KEY / 4 + 1];
str->append(STRING_WITH_LEN("Range checked for each "
"record (index map: 0x"));
str->append(range_checked_map.print(buf));
str->append(range_checked_fer->keys_map.print(buf));
str->append(')');
break;
}