Query time 0.00100
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "1.47"
},
"nested_loop": [
{
"table": {
"table_name": "v",
"access_type": "ref",
"possible_keys": [
"PRIMARY",
"fl",
"variant_id",
"lang_code",
"product_id",
"fpl",
"idx_product_feature_variant_id"
],
"key": "PRIMARY",
"used_key_parts": [
"feature_id",
"product_id"
],
"key_length": "6",
"ref": [
"const",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "11.11",
"using_index": true,
"cost_info": {
"read_cost": "1.00",
"eval_cost": "0.02",
"prefix_cost": "1.20",
"data_read_per_join": "88"
},
"used_columns": [
"feature_id",
"product_id",
"variant_id",
"lang_code"
],
"attached_condition": "(`eshopuga_upgr_4122`.`v`.`lang_code` = 'it')"
}
},
{
"table": {
"table_name": "f",
"access_type": "ref",
"possible_keys": [
"feature_id"
],
"key": "feature_id",
"used_key_parts": [
"feature_id"
],
"key_length": "3",
"ref": [
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "100.00",
"cost_info": {
"read_cost": "0.11",
"eval_cost": "0.02",
"prefix_cost": "1.33",
"data_read_per_join": "7"
},
"used_columns": [
"filter_id",
"feature_id"
]
}
},
{
"table": {
"table_name": "variant_descriptions",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"variant_id",
"lang_code"
],
"key_length": "9",
"ref": [
"eshopuga_upgr_4122.v.variant_id",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "100.00",
"cost_info": {
"read_cost": "0.11",
"eval_cost": "0.02",
"prefix_cost": "1.47",
"data_read_per_join": "344"
},
"used_columns": [
"variant_id",
"variant",
"lang_code"
]
}
}
]
}
}