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EXPLAIN FORMAT=JSON: produce the 'ref' column.

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This commit is contained in:
Sergei Petrunia
2014-08-12 18:14:56 +04:00
parent 84485dbe7c
commit a9d43d70f5
4 changed files with 49 additions and 41 deletions
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36
sql/sql_select.cc
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@ -23261,23 +23261,14 @@ void explain_append_mrr_info(QUICK_RANGE_SELECT *quick, String *res)
///////////////////////////////////////////////////////////////////////////////
// TODO: join with make_possible_keys_line ?
int append_possible_keys(MEM_ROOT *alloc, List<char> &list, TABLE *table,
int append_possible_keys(MEM_ROOT *alloc, String_list &list, TABLE *table,
key_map possible_keys)
{
uint j;
for (j=0 ; j < table->s->keys ; j++)
{
if (possible_keys.is_set(j))
{
const char *key_name= table->key_info[j].name;
size_t len= strlen(key_name);
char *cp;
if (!(cp = (char*)alloc_root(alloc, len)))
return 1;
memcpy(cp, key_name, len+1);
list.push_back(cp);
}
list.append_str(alloc, table->key_info[j].name);
}
return 0;
}
@ -23312,13 +23303,10 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
TABLE *table=tab->table;
TABLE_LIST *table_list= tab->table->pos_in_table_list;
char buff4[512];
my_bool key_read;
char table_name_buffer[SAFE_NAME_LEN];
String tmp4(buff4,sizeof(buff4),cs);
KEY *key_info= 0;
uint key_len= 0;
tmp4.length(0);
quick_type= -1;
QUICK_SELECT_I *quick= NULL;
@ -23456,14 +23444,11 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
store_key **ref=tab->ref.key_copy;
for (uint kp= 0; kp < tab->ref.key_parts; kp++)
{
if (tmp4.length())
tmp4.append(',');
if ((key_part_map(1) << kp) & tab->ref.const_ref_part_map)
tmp4.append("const");
eta->ref_list.append_str(thd->mem_root, "const");
else
{
tmp4.append((*ref)->name(), strlen((*ref)->name()), cs);
eta->ref_list.append_str(thd->mem_root, (*ref)->name());
ref++;
}
}
@ -23477,17 +23462,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
table->key_info[tab->index].key_length);
}
if (key_info)
{
if (key_info && tab_type != JT_NEXT)
{
eta->ref.copy(tmp4);
eta->ref_set= true;
}
else
eta->ref_set= false;
}
else
if (!key_info)
{
if (table_list && /* SJM bushes don't have table_list */
table_list->schema_table &&
@ -23517,7 +23492,6 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
if (key_name_buf.length())
eta->key.set(thd->mem_root, key_name_buf.c_ptr_safe(), -1);
}
eta->ref_set= false;
}
/* "rows" */