[英]how to get a max per group and subgroup using jq
jq 是一个了不起的工具,它做了很多。 作为输入我有
[
{
"backup": [
{
"timestamp": { "start": 1642144383, "stop": 1642144386 },
"info": { "size": 1200934840},
"type": "full"
},
{
"timestamp": {"start": 1642144388, "stop": 1642144392 },
"info": { "size": 1168586300
},
"type": "incr"
},
{
"timestamp": {"start": 1642145388, "stop": 1642145392 },
"info": { "size": 1168586330
},
"type": "incr"
}
],
"name": "dbname1"
},
{
"backup": [
{
"timestamp": { "start": 1642144383, "stop": 1642144386 },
"info": { "size": 1200934840},
"type": "full"
},
{
"timestamp": {"start": 1642144388, "stop": 1642144392 },
"info": { "size": 1168586300
},
"type": "incr"
}
],
"name": "dbname2"
}
]
并使用
jq 'map([.backup[] + {name}] | max_by(.timestamp.stop))'
我得到了最新的 timestamp.stop 名称。 我应该如何更改它以获取名称和组的最新 timestamp.stop? 在 SQL 这将类似于 max(.timestamp.stop) group by.name,.type 希望 output 像:
[
{
"timestamp": {
"start": 1642144383,
"stop": 1642144386
},
"info": {
"size": 1200934840
},
"type": "full",
"name": "dbname1"
},
{
"timestamp": {
"start": 1642145388,
"stop": 1642145392
},
"info": {
"size": 1168586330
},
"type": "incr",
"name": "dbname1"
},
{
"timestamp": {
"start": 1642144383,
"stop": 1642144386
},
"info": {
"size": 1200934840
},
"type": "full",
"name": "dbname2"
},
{
"timestamp": {
"start": 1642144388,
"stop": 1642144392
},
"info": {
"size": 1168586300
},
"type": "incr",
"name": "dbname2"
}
]
删除内括号以展平数组,然后group_by
两个条件(这使您的条件成为一个数组)和map
您的max_by
到结果数组:
jq 'map(.backup[] + {name}) | group_by([.name, .type]) | map(max_by(.timestamp.stop))'
[
{
"timestamp": {
"start": 1642144383,
"stop": 1642144386
},
"info": {
"size": 1200934840
},
"type": "full",
"name": "dbname1"
},
{
"timestamp": {
"start": 1642145388,
"stop": 1642145392
},
"info": {
"size": 1168586330
},
"type": "incr",
"name": "dbname1"
},
{
"timestamp": {
"start": 1642144383,
"stop": 1642144386
},
"info": {
"size": 1200934840
},
"type": "full",
"name": "dbname2"
},
{
"timestamp": {
"start": 1642144388,
"stop": 1642144392
},
"info": {
"size": 1168586300
},
"type": "incr",
"name": "dbname2"
}
]
这似乎产生了预期的 output。 在执行max_by
之前,您需要按.type
记录进行额外分组
map( .backup[] + {name} ) | group_by(.name)[] |
group_by(.type) | map(max_by(.timestamp.stop))
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