{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "17.80"
},
"ordering_operation": {
"using_filesort": true,
"cost_info": {
"sort_cost": "7.30"
},
"nested_loop": [
{
"table": {
"table_name": "cscart_vendor_following",
"access_type": "ALL",
"rows_examined_per_scan": 73,
"rows_produced_per_join": 7,
"filtered": "10.00",
"cost_info": {
"read_cost": "7.22",
"eval_cost": "0.73",
"prefix_cost": "7.95",
"data_read_per_join": "233"
},
"used_columns": [
"user_id",
"vendor_id",
"followed_on"
],
"attached_condition": "(`cscartdb`.`cscart_vendor_following`.`vendor_id` = 372)"
}
},
{
"table": {
"table_name": "cscart_users",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"user_id"
],
"key_length": "3",
"ref": [
"cscartdb.cscart_vendor_following.user_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 7,
"filtered": "100.00",
"cost_info": {
"read_cost": "1.83",
"eval_cost": "0.73",
"prefix_cost": "10.50",
"data_read_per_join": "48K"
},
"used_columns": [
"user_id",
"firstname",
"lastname",
"email"
],
"attached_condition": "<if>(is_not_null_compl(cscart_users), (`cscartdb`.`cscart_users`.`user_id` = `cscartdb`.`cscart_vendor_following`.`user_id`), true)"
}
}
]
}
}
}