create table t2(a int); insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 ( a int not null ) partition by key(a); insert into t1 select a from t2; explain partitions select * from t1 where a in (2,3,4); id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 10 Using where explain format=json select * from t1 where a in (2,3,4); EXPLAIN { "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [ { "table": { "table_name": "t1", "partitions": ["p0"], "access_type": "ALL", "loops": 1, "rows": 10, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.a in (2,3,4)" } } ] } } analyze format=json select * from t1 where a in (2,3,4); ANALYZE { "query_optimization": { "r_total_time_ms": "REPLACED" }, "query_block": { "select_id": 1, "cost": "REPLACED", "r_loops": 1, "r_total_time_ms": "REPLACED", "nested_loop": [ { "table": { "table_name": "t1", "partitions": ["p0"], "access_type": "ALL", "loops": 1, "r_loops": 1, "rows": 10, "r_rows": 10, "cost": "REPLACED", "r_table_time_ms": "REPLACED", "r_other_time_ms": "REPLACED", "r_engine_stats": REPLACED, "filtered": 100, "r_filtered": 30, "attached_condition": "t1.a in (2,3,4)" } } ] } } analyze format=json update t1 set a=a+10 where a in (2,3,4); ANALYZE { "query_optimization": { "r_total_time_ms": "REPLACED" }, "query_block": { "select_id": 1, "r_total_time_ms": "REPLACED", "buffer": { "table": { "update": 1, "table_name": "t1", "partitions": ["p0"], "access_type": "ALL", "rows": 10, "r_rows": 10, "r_filtered": 30, "r_total_time_ms": "REPLACED", "r_engine_stats": REPLACED, "attached_condition": "t1.a in (2,3,4)" } } } } analyze format=json delete from t1 where a in (20,30,40); ANALYZE { "query_optimization": { "r_total_time_ms": "REPLACED" }, "query_block": { "select_id": 1, "r_total_time_ms": "REPLACED", "table": { "delete": 1, "table_name": "t1", "partitions": ["p0"], "access_type": "ALL", "rows": 10, "r_rows": 10, "r_filtered": 0, "r_total_time_ms": "REPLACED", "r_engine_stats": REPLACED, "attached_condition": "t1.a in (20,30,40)" } } } drop table t1,t2;