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subq24_sj_materialization_exp.sql.json
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{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "16.59"
},
"nested_loop": [
{
"table": {
"table_name": "<subquery2>",
"access_type": "ALL",
"materialized_from_subquery": {
"using_temporary_table": true,
"query_block": {
"table": {
"table_name": "a",
"access_type": "range",
"possible_keys": [
"PRIMARY",
"dept_no"
],
"key": "dept_no",
"used_key_parts": [
"dept_no"
],
"key_length": "16",
"rows_examined_per_scan": 20,
"rows_produced_per_join": 20,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "2.28",
"eval_cost": "2.00",
"prefix_cost": "4.28",
"data_read_per_join": "640"
},
"used_columns": [
"emp_no",
"dept_no"
],
"attached_condition": "(`employees`.`a`.`dept_no` >= 'd003')"
}
}
}
}
},
{
"table": {
"table_name": "e",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"emp_no"
],
"key_length": "4",
"ref": [
"<subquery2>.emp_no"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 1,
"filtered": "100.00",
"cost_info": {
"read_cost": "0.27",
"eval_cost": "0.10",
"prefix_cost": "16.59",
"data_read_per_join": "136"
},
"used_columns": [
"emp_no",
"birth_date",
"first_name",
"last_name",
"gender",
"hire_date"
]
}
}
]
}
}