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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_total_filtered": 30,
"attached_condition": "t1.a in (2,3,4)",
"r_filtered": 30
}
}
]
}
}
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_total_filtered": 30,
"r_total_time_ms": "REPLACED",
"r_engine_stats": REPLACED,
"attached_condition": "t1.a in (2,3,4)",
"r_filtered": 30
}
}
}
}
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_total_filtered": 0,
"r_total_time_ms": "REPLACED",
"r_engine_stats": REPLACED,
"attached_condition": "t1.a in (20,30,40)",
"r_filtered": 0
}
}
}
drop table t1,t2;
|
