Question

我在索引my_index中有两种类型。一个是另一个的父母。该子名称为calendar，父名称为stock。一个stock可以有多个calendar条目，但不是反之亦然。我需要计算在一系列日期（大于或等于和小于或等于）中有库存的天数。我该怎么办？

stock条目或多或少看起来像这样：

{
    "_index": "my_index",
    "_type": "stock",
    "_id": "21321",
    "_score": 1,
    "_source": {
      "description": "Screwdriver",
      "size": "big",
      "some_characteristic1": null,
      "some_characteristic2": "Good",
      "id": 21321,
      ...
    }
}

calendar条目或多或少看起来像这样：

{
    "_index": "my_index",
    "_type": "calendar",
    "_id": "21321-20161129",
    "_score": 1,
    "_routing": "21321",
    "_parent": "21321",
    "_source": {
      "available": true,
      "date": "2016-11-29",
      "prices": {
        "price": 2150
      }
    }
}, ...

此查询的结果应该或多或少看起来像这样：

{
      "description": "Screwdriver",
      "size": "big",
      "some_characteristic1": null,
      "some_characteristic2": "Good",
      "id": 21321,
      "available_days_in_february": {
          "count": 12,
          "total_count": 28
      }
}

sql中的类似查询可能如下所示：

SELECT s.*, sum(c.available = true) as count, count(c.available) as total_count
FROM stock as s
LEFT JOIN calendar as c ON s.id = c._parent
WHERE c.date >= 2017-02-01 AND c.date <= 2017-02-28

在Elasticsearch中使用日期过滤器进行子查询

0 个答案: