Sample code
/*
* Use the multiFieldQuery() API.
* You can create a request to query multi-value data by using this process: Specify the MultiFieldSubQueryDetails (list) information, create a MultiFieldSubQuery request, and then create a MultiFieldQuery request.
* You can create multiple subqueries for each multi-value data query.
*
* You must provide the following information when you perform a query:
* MultiFieldSubQueryDetails: the details of the specific fields for the target metric. The fields are the sub-category of the metric. For example, you can query only the speed or direction fields.
* You can specify the following parameters: aggregator, dpValue, rate, and downsample.
* Metric: the metric to be queried, for example, wind.
* Time Range: Start Time and End Time
*
* The following information is optional:
* Tags: the conditions that are used to filter timelines.
* Limit/Offset: the pagination details.
*/
// Create the fields that you want to query.
MultiFieldSubQueryDetails speedFieldDetails = MultiFieldSubQueryDetails
.field("speed").aggregator(Aggregator.SUM).downsample("2s-sum").build();
MultiFieldSubQueryDetails levelFieldDetails = MultiFieldSubQueryDetails
.field("level").aggregator(Aggregator.AVG).downsample("2s-avg").build();
MultiFieldSubQueryDetails tempFieldDetails = MultiFieldSubQueryDetails
.field("temperature").aggregator(Aggregator.COUNT).downsample("2s-count").build();
MultiFieldSubQueryDetails allFieldsDetails1 = MultiFieldSubQueryDetails
.field("*").aggregator(Aggregator.MAX).downsample("2s-max").alias("max_").build();
MultiFieldSubQueryDetails allFieldsDetails2 = MultiFieldSubQueryDetails
.field("*").aggregator(Aggregator.MIN).downsample("2s-min").alias("min_").build();
List<MultiFieldSubQueryDetails> subQueryDetails = new LinkedList<>();
subQueryDetails.add(speedFieldDetails);
subQueryDetails.add(levelFieldDetails);
subQueryDetails.add(tempFieldDetails);
subQueryDetails.add(allFieldsDetails1);
subQueryDetails.add(allFieldsDetails2);
// Create a subquery for the multi-value data model.
MultiFieldSubQuery subQuery = MultiFieldSubQuery.metric(metric).fieldsInfo(subQueryDetails)
.filter(Filter.filter(FilterType.LiteralOr, "district", "Yuhang|Xiacheng|Xihu", true).build())
.build();
// Create a query for the multi-value data model.
MultiFieldQuery query = MultiFieldQuery.start(1542772000L).end(1542772020L).msResolution(false)
.sub(subQuery).build();
List<MultiFieldQueryResult> results = tsdb.multiFieldQuery(query);