{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "152.46"
},
"nested_loop": [
{
"table": {
"table_name": "V",
"access_type": "ref",
"possible_keys": [
"PRIMARY",
"feature_id"
],
"key": "feature_id",
"used_key_parts": [
"feature_id"
],
"key_length": "3",
"ref": [
"const"
],
"rows_examined_per_scan": 338,
"rows_produced_per_join": 338,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "0.31",
"eval_cost": "33.80",
"prefix_cost": "34.11",
"data_read_per_join": "512K"
},
"used_columns": [
"variant_id",
"feature_id"
],
"attached_condition": "(`dev2`.`V`.`variant_id` is not null)"
}
},
{
"table": {
"table_name": "D",
"access_type": "ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"variant_id"
],
"key_length": "3",
"ref": [
"dev2.V.variant_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 33,
"filtered": "10.00",
"cost_info": {
"read_cost": "84.50",
"eval_cost": "3.38",
"prefix_cost": "152.46",
"data_read_per_join": "143K"
},
"used_columns": [
"variant_id",
"variant",
"link"
],
"attached_condition": "(`dev2`.`D`.`link` = '285')"
}
}
]
}
}
variant |
---|
285 |