{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "1.20"
},
"grouping_operation": {
"using_temporary_table": true,
"using_filesort": true,
"table": {
"table_name": "cscart_product_reviews",
"access_type": "ref",
"possible_keys": [
"idx_product_id"
],
"key": "idx_product_id",
"used_key_parts": [
"product_id"
],
"key_length": "3",
"ref": [
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "10.00",
"index_condition": "(`webmarco`.`cscart_product_reviews`.`product_id` <=> 339843)",
"cost_info": {
"read_cost": "1.00",
"eval_cost": "0.02",
"prefix_cost": "1.20",
"data_read_per_join": "167"
},
"used_columns": [
"product_id",
"rating_value",
"status"
],
"attached_condition": "(`webmarco`.`cscart_product_reviews`.`status` = 'A')"
}
}
}
}