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EXPLAIN FORMAT=JSON: produce used_key_parts, JSON-ish output for index_merge.

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This commit is contained in:
Sergei Petrunia
2014-08-14 01:12:05 +04:00
parent a9d43d70f5
commit 041e03e251
6 changed files with 274 additions and 47 deletions
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49
sql/sql_explain.h
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@@ -14,6 +14,15 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
class String_list: public List<char>
{
public:
bool append_str(MEM_ROOT *mem_root, const char *str);
};
/* Data structures for ANALYZE */
class Table_access_tracker
{
@@ -417,21 +426,16 @@ class Explain_index_use : public Sql_alloc
{
char *key_name;
uint key_len;
/* will add #keyparts here if we implement EXPLAIN FORMAT=JSON */
public:
void set(MEM_ROOT *root, const char *key_name_arg, uint key_len_arg)
String_list key_parts_list;
void clear()
{
if (key_name_arg)
{
size_t name_len= strlen(key_name_arg);
if ((key_name= (char*)alloc_root(root, name_len+1)))
memcpy(key_name, key_name_arg, name_len+1);
}
else
key_name= NULL;
key_len= key_len_arg;
key_name= NULL;
key_len= (uint)-1;
}
void set(MEM_ROOT *root, KEY *key_name, uint key_len_arg);
void set_pseudo_key(MEM_ROOT *root, const char *key_name);
inline const char *get_key_name() { return key_name; }
inline uint get_key_len() { return key_len; }
@@ -448,6 +452,13 @@ public:
{}
const int quick_type;
bool is_basic()
{
return (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE ||
quick_type == QUICK_SELECT_I::QS_TYPE_RANGE_DESC ||
quick_type == QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX);
}
/* This is used when quick_type == QUICK_SELECT_I::QS_TYPE_RANGE */
Explain_index_use range;
@@ -458,19 +469,15 @@ public:
void print_extra(String *str);
void print_key(String *str);
void print_key_len(String *str);
private:
void print_json(Json_writer *writer);
void print_extra_recursive(String *str);
private:
const char *get_name_by_type();
};
class String_list: public List<char>
{
public:
bool append_str(MEM_ROOT *mem_root, const char *str);
};
/*
EXPLAIN data structure for a single JOIN_TAB.
*/
@@ -565,7 +572,7 @@ public:
private:
void append_tag_name(String *str, enum explain_extra_tag tag);
void fill_key_str(String *key_str);
void fill_key_str(String *key_str, bool is_json);
void fill_key_len_str(String *key_len_str);
double get_r_filtered();
void tag_to_json(Json_writer *writer, enum explain_extra_tag tag);