需要帮助在雪花中解析这个

Question

[{“腿”：[{“点”：[{“纬度”：29.76524，“经度”：-95.35406}，{“纬度”：30.74438，“经度”：-101.71203}，{“纬度” ：30.74421，“经度”：-101.71247 }，{“纬度”：30.74404，“经度”：-101.71289 }，{“纬度”：30.74366，“经度”：-101.71374 }，{“纬度”：30.74346，“经度” “：-101.71415 }，{“纬度”：30.74303，“经度”：-101.71495 }，{“纬度”：30.74274，“经度”：-101.71543 }，{“纬度”：30.74234，“经度”：-101.71606 } ，{“纬度”：31.82985，“经度”：-102.34753}，{“纬度”：31.8302，“经度”：-102.34597}，{“纬度”：31.83029，“经度”：-102.34557}，{“纬度” ：31.83038，“经度”：-102.34526 }，{“纬度”：31.83051，“经度”：-102.3448 }，{“纬度”：31.83081，“经度”：-102.344 }，{“纬度”：31.83099，“经度” “：-102.34356 }，{“纬度”：31.83113，“经度”：-102.34328 }，{“纬度”：31.83145，“经度”：-102.34271 }，{“纬度”：31.83174，“经度”：-102.34226 } ，{“拉纬度：31.83207，“经度”：-102.34181 }，{“纬度”：31.83267，“经度”：-102.34109 }，{“纬度”：31.83317，“经度”：-102.34053 }，{“纬度”：31.83359， “经度”：-102.34007 }，{“纬度”：31.8339，“经度”：-102.33971 }，{“纬度”：31.83499，“经度”：-102.33852 }，{“纬度”：31.83547，“经度”：- 102.338 }，{“纬度”：31.83553，“经度”：-102.33793 }，{“纬度”：31.83685，“经度”：-102.33648 }，{“纬度”：31.83764，“经度”：-102.3356 }，{“纬度：31.83838，“经度”：-102.33479 }，{“纬度”：31.84575，“经度”：-102.32666 }，{“纬度”：31.84603，“经度”：-102.32636 }，{“纬度”：31.84679， “经度”：-102.32551 }，{“纬度”：31.84878，“经度”：-102.32333 }，{“纬度”：31.85095，“经度”：-102.32094 }，{“纬度”：31.85131，“经度”：- 102.32054 }，{“纬度”：31.85134，“经度”：-102.32044 }，{“纬度”：31.85259，“经度”：-102.31886 }，{“纬度”：31.85273，“经度”：-10 2.31859 }，{“纬度”：31.85462，“经度”：-102.3165 }，{“纬度”：31.85467，“经度”：-102.31644 }，{“纬度”：31.85489，“经度”：-102.3162 }，{“纬度：31.85505，“经度”：-102.3164 }，{“纬度”：31.8552，“经度”：-102.3166 }，{“纬度”：31.85533，“经度”：-102.31677 }，{“纬度”：31.85506， “经度”：-102.31706 }，{“纬度”：31.85655，“经度”：-102.32234 }，{“纬度”：31.85851，“经度”：-102.32294 }]，“摘要”：{“到达时间”：“2020 -06-04T01:22:22-05:00”、“departureTime”：“2020-06-03T17:28:11-05:00”、“lengthInMeters”：863989、“trafficDelayInSeconds”：528、“travelTimeInSeconds”： 28451 } } ]，“sections”：[{“endPointIndex”：5797，“sectionType”：“TRAVEL_MODE”，“startPointIndex”：0，“travelMode”：“car”}]，“summary”：{“arrivalTime”： “2020-06-04T01:22:22-05:00”、“departureTime”：“2020-06-03T17:28:11-05:00”、“lengthInMeters”：863989、“trafficDelayInSeconds”：528、“travelTimeInSeconds ": 28451 } } ]

Answer 1

我会查阅文档，尤其是 https://docs.snowflake.com/en/sql-reference/functions/flatten.html 和 https://docs.snowflake.com/en/user-guide/semistructured-concepts.html

这将取决于您如何加载数据，但这里有一个示例查询可以帮助您入门：

with tbl as (select parse_json($1)::variant list_json from values ('[ { "legs": [ { "points": [ { "latitude": 29.76524, "longitude": -95.35406 }, { "latitude": 30.74438, "longitude": -101.71203 }, { "latitude": 30.74421, "longitude": -101.71247 }, { "latitude": 30.74404, "longitude": -101.71289 }, { "latitude": 30.74366, "longitude": -101.71374 }, { "latitude": 30.74346, "longitude": -101.71415 }, { "latitude": 30.74303, "longitude": -101.71495 }, { "latitude": 30.74274, "longitude": -101.71543 }, { "latitude": 30.74234, "longitude": -101.71606 }, { "latitude": 31.82985, "longitude": -102.34753 }, { "latitude": 31.8302, "longitude": -102.34597 }, { "latitude": 31.83029, "longitude": -102.34557 }, { "latitude": 31.83038, "longitude": -102.34526 }, { "latitude": 31.83051, "longitude": -102.3448 }, { "latitude": 31.83081, "longitude": -102.344 }, { "latitude": 31.83099, "longitude": -102.34356 }, { "latitude": 31.83113, "longitude": -102.34328 }, { "latitude": 31.83145, "longitude": -102.34271 }, { "latitude": 31.83174, "longitude": -102.34226 }, { "latitude": 31.83207, "longitude": -102.34181 }, { "latitude": 31.83267, "longitude": -102.34109 }, { "latitude": 31.83317, "longitude": -102.34053 }, { "latitude": 31.83359, "longitude": -102.34007 }, { "latitude": 31.8339, "longitude": -102.33971 }, { "latitude": 31.83499, "longitude": -102.33852 }, { "latitude": 31.83547, "longitude": -102.338 }, { "latitude": 31.83553, "longitude": -102.33793 }, { "latitude": 31.83685, "longitude": -102.33648 }, { "latitude": 31.83764, "longitude": -102.3356 }, { "latitude": 31.83838, "longitude": -102.33479 }, { "latitude": 31.84575, "longitude": -102.32666 }, { "latitude": 31.84603, "longitude": -102.32636 }, { "latitude": 31.84679, "longitude": -102.32551 }, { "latitude": 31.84878, "longitude": -102.32333 }, { "latitude": 31.85095, "longitude": -102.32094 }, { "latitude": 31.85131, "longitude": -102.32054 }, { "latitude": 31.85134, "longitude": -102.32044 }, { "latitude": 31.85259, "longitude": -102.31886 }, { "latitude": 31.85273, "longitude": -102.31859 }, { "latitude": 31.85462, "longitude": -102.3165 }, { "latitude": 31.85467, "longitude": -102.31644 }, { "latitude": 31.85489, "longitude": -102.3162 }, { "latitude": 31.85505, "longitude": -102.3164 }, { "latitude": 31.8552, "longitude": -102.3166 }, { "latitude": 31.85533, "longitude": -102.31677 }, { "latitude": 31.85506, "longitude": -102.31706 }, { "latitude": 31.85655, "longitude": -102.32234 }, { "latitude": 31.85851, "longitude": -102.32294 } ], "summary": { "arrivalTime": "2020-06-04T01:22:22-05:00", "departureTime": "2020-06-03T17:28:11-05:00", "lengthInMeters": 863989, "trafficDelayInSeconds": 528, "travelTimeInSeconds": 28451 } } ], "sections": [ { "endPointIndex": 5797, "sectionType": "TRAVEL_MODE", "startPointIndex": 0, "travelMode": "car" } ], "summary": { "arrivalTime": "2020-06-04T01:22:22-05:00", "departureTime": "2020-06-03T17:28:11-05:00", "lengthInMeters": 863989, "trafficDelayInSeconds": 528, "travelTimeInSeconds": 28451 } } ]') t)
     ,flat_tbl as (select unnested.value json from tbl, lateral flatten(list_json) unnested)

select
    legs.value:summary.trafficDelayInSeconds trafficDelayInSeconds,
    legs.value:summary summary,
    points.value point
from flat_tbl,
    lateral flatten(json:legs) legs,
    lateral flatten(legs.value:points) points
;

它会产生这样的结果，这只是对您在解析方面可能要做的事情的猜测。

TRAFFICDELAYINSECONDS   SUMMARY POINT
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 29.76524,    "longitude": -95.35406  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74438,    "longitude": -101.71203  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74421,    "longitude": -101.71247  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74404,    "longitude": -101.71289  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74366,    "longitude": -101.71374  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74346,    "longitude": -101.71415  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74303,    "longitude": -101.71495  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74274,    "longitude": -101.71543  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 30.74234,    "longitude": -101.71606  }
528 {    "arrivalTime": "2020-06-04T01:22:22-05:00",    "departureTime": "2020-06-03T17:28:11-05:00",    "lengthInMeters": 863989,    "trafficDelayInSeconds": 528,    "travelTimeInSeconds": 28451  }  {    "latitude": 31.82985,    "longitude": -102.34753  }