es 實現字段之間進行比對

sql 例如:

select * from user t where t.count = t.num;

es 查詢語句如下:

{
  "query": {
    "bool": {
      "must": {
        "script": {
          "script": {
            "source": "doc['fieldA'].value >= doc['fieldB'].value"
          }
        }
      }
    }
  }
}

示例：

{
	"from": 0,
	"size": 100,
	"query": {
		"bool": {
			"filter": {
				"script": {
					"script": {
						"inline": "doc['count'].value - doc['num'].value == 0",
						"lang": "painless"
					},
					"boost": 1
				}
			}
		}
	}
}

javaApi 如下:

        Map<String, Object> params = new HashMap<>();
        Script script = new Script(ScriptType.INLINE,"painless","doc['count'].value - doc['num'].value == 0",params);
        ScriptQueryBuilder scriptQueryBuilder = new ScriptQueryBuilder(script);
        StringBuffer queryString = new StringBuffer();
       //   queryString.append("goods_id:18506");
        QueryStringQueryBuilder queryStringQueryBuilder = new QueryStringQueryBuilder(queryString.toString());
        BoolQueryBuilder booleanQueryBuilder = QueryBuilders.boolQuery();
        booleanQueryBuilder.must(scriptQueryBuilder);
        if (queryString.length() > 0){
            booleanQueryBuilder.must(queryStringQueryBuilder);
        }
        System.out.println("查詢條件:" + booleanQueryBuilder);
        SearchResponse searchResponse = getClient().prepareSearch("goods_recommend")
                .setTypes("tags")
                .setQuery(booleanQueryBuilder)
                .get();
        SearchHit[] hits = searchResponse.getHits().getHits();
        List list = new ArrayList();
        for (int i = 0; i < hits.length; i++) {
            System.out.println(JSON.toJSON(hits[i]));
        //            list.add(hits[i].getId());
        }

ES中Date型字段不能直接用>,<,+,-進行比較和計算，會報錯。

可以先把Date類型取得getMillis()，取得時間戳，然後就可以進行比較了。

使用TransportClient代碼如下,param是傳入的參數，可以在script中使用  

Map<String, Object> params = Maps.newHashMap();
        params.put("datesub", 5);
        QueryBuilder qb = QueryBuilders.boolQuery()
                .must(QueryBuilders.scriptQuery(
                        new Script(Script.DEFAULT_SCRIPT_TYPE, 
                                Script.DEFAULT_SCRIPT_LANG, 
                                "doc['updated_time'].value.getMillis() - doc['create_time'].value.getMillis() < params.datesub", 
                                params)));

 script：

{
	"from": 0,
	"size": 100,
	"query": {
		"bool": {
			"filter": {
				"script": {
					"script": {
						"inline": "doc['updated_time'].value.getMillis() - doc['updated_time'].value.getMillis() == 0",
						"lang": "painless"
					},
					"boost": 1
				}
			}
		}
	}
}

參照：

https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-using.html