Quelle  explain_json_format_partitions.result   Sprache: Lisp

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_table_time_ms": "REPLACED",
        "r_other_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_table_time_ms": "REPLACED",
      "r_other_time_ms": "REPLACED",
      "r_engine_stats": REPLACED,
      "attached_condition": "t1.a in (20,30,40)",
      "r_filtered": 0
    }
  }
}
drop table t1,t2;