展平并重构 JSON 雪花

Question

我仍在学习雪花，任何帮助将不胜感激。

我有一个专栏，我们称之为“结果”。

{
  "catalog": [
    {
      "img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg",
      "name": "ADITI HAND BLOCKED PRINT",
      "price": 16
    },
    {
      "img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg",
      "name": "TORBAY HAND BLOCKED PRINT",
      "price": 17
    },
    {
      "img_href": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg",
      "name": "ADITI HAND BLOCKED PRINT",
      "price": 18
    }
  ],
  "datetime": 161878993658
  "catalog_id": 1
}

我想将其展平并重建如下

[
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg"
  },
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg"
  },
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg"
  },
]

Answer 1

以下将执行此操作。 您将不需要 CTE，因此删除它并将tbl的使用替换为您的表名称，并将json的使用替换为您的变量列。

/*delete this line*/ with tbl as (select parse_json($1) json from values('{"catalog":[{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg","name":"ADITI HAND BLOCKED PRINT","price":16},{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg","name":"TORBAY HAND BLOCKED PRINT","price":17},{"img_href":"https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg","name":"ADITI HAND BLOCKED PRINT","price":18}],"datetime":161878993658,"catalog_id":1}'))

select array_agg(new_col) reconstructed
from (
  /* replace json and tbl */ select object_construct('datetime', json:datetime, 'url', obj.value:img_href) new_col, json:catalog_id catalog_id
  from tbl, lateral flatten(json:catalog) obj
) group by catalog_id;

它输出

[
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179361.jpg"
  },
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179330.jpg"
  },
  {
    "datetime": 161878993658,
    "url": "https://schumacher-webassets.s3.amazonaws.com/Web%20Catalog-600/179362.jpg"
  }
]