为了分析我的查询，我使用以下语句跟踪它
total costs产生了下面的输出。关键是：我可以与其他查询比较总成本吗？或者我是否必须总结每个节点的所有[
{
"Plan": {
"Node Type": "Sort",
"Startup Cost": 48.47,
"Total Cost": 48.97,
"Plan Rows": 200,
"Plan Width": 16,
"Sort Key": ["r.range_start"],
"Plans": [
{
"Node Type": "Aggregate",
"Strategy": "Plain",
"Parent Relationship": "InitPlan",
"Subplan Name": "CTE times",
"Startup Cost": 1.17,
"Total Cost": 1.25,
"Plan Rows": 1,
"Plan Width": 8,
"Plans": [
{
"Node Type": "Seq Scan",
"Parent Relationship": "Outer",
"Relation Name": "hst_energy_d",
"Alias": "hst_energy_d",
"Startup Cost": 0.00,
"Total Cost": 1.15,
"Plan Rows": 10,
"Plan Width": 8,
"Filter": "((idinstrum = 4) AND (id_device = 122))"
}
]
},
{
"Node Type": "CTE Scan",
"Parent Relationship": "InitPlan",
"Subplan Name": "CTE ranges",
"CTE Name": "times",
"Alias": "times",
"Startup Cost": 0.00,
"Total Cost": 5.02,
"Plan Rows": 1000,
"Plan Width": 16
},
{
"Node Type": "Seq Scan",
"Parent Relationship": "InitPlan",
"Subplan Name": "CTE rounded_hst",
"Relation Name": "hst_energy_d",
"Alias": "hst_energy_d",
"Startup Cost": 0.00,
"Total Cost": 1.47,
"Plan Rows": 10,
"Plan Width": 576,
"Filter": "((idinstrum = 4) AND (id_device = 122))"
},
{
"Node Type": "Aggregate",
"Strategy": "Hashed",
"Parent Relationship": "Outer",
"Startup Cost": 29.57,
"Total Cost": 33.08,
"Plan Rows": 200,
"Plan Width": 16,
"Plans": [
{
"Node Type": "Hash Join",
"Parent Relationship": "Outer",
"Join Type": "Left",
"Startup Cost": 0.33,
"Total Cost": 24.57,
"Plan Rows": 1000,
"Plan Width": 16,
"Hash Cond": "(r.range_start = hd.round_time)",
"Plans": [
{
"Node Type": "CTE Scan",
"Parent Relationship": "Outer",
"CTE Name": "ranges",
"Alias": "r",
"Startup Cost": 0.00,
"Total Cost": 20.00,
"Plan Rows": 1000,
"Plan Width": 8
},
{
"Node Type": "Hash",
"Parent Relationship": "Inner",
"Startup Cost": 0.20,
"Total Cost": 0.20,
"Plan Rows": 10,
"Plan Width": 16,
"Plans": [
{
"Node Type": "CTE Scan",
"Parent Relationship": "Outer",
"CTE Name": "rounded_hst",
"Alias": "hd",
"Startup Cost": 0.00,
"Total Cost": 0.20,
"Plan Rows": 10,
"Plan Width": 16
}
]
}
]
}
]
}
]
}
}
]
？
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