Tablestore:Geo-distance query

1. Go to the Indexes tab.

   1. Log on to the Tablestore console.

   2. In the top navigation bar, select a resource group and a region.

   3. On the Overview page, click the name of the instance that you want to manage or click Manage Instance in the Actions column of the instance.

   4. On the Tables tab of the Instance Details tab, click the name of the data table or click Indexes in the Actions column of the data table.

2. On the Indexes tab, find the search index that you want to use to query data and click Manage Data in the Actions column.

3. In the Search dialog box, configure query parameters.

   1. By default, the system returns all attribute columns. To return specific attribute columns, turn off All Columns and specify the attribute columns that you want to return. Separate multiple attribute columns with commas (,).

      Note

      By default, the system returns all primary key columns of the data table.

   2. Select the And, Or, or Not logical operator based on your business requirements.

      If you select the And logical operator, data that meets the query conditions is returned. If you select the Or operator and specify a single query condition, data that meets the query condition is returned. If you select the Or logical operator and specify multiple query conditions, data that meets one of the query conditions is returned. If you select the Not logical operator, data that does not meet the query conditions is returned.

   3. Select an index field of the GEOPOINT data type and click Add.

   4. Set the query type of the index field to GeoDistanceQuery, enter and select the coordinate pair of the central point, and then enter the distance.

      If you want to enter multiple coordinate pairs of central points, repeat the preceding operation.

   5. By default, the sorting feature is disabled. If you want to sort the query results based on specific fields, turn on Sort and specify the fields based on which you want to sort the query results and the sorting order.

   6. By default, the aggregation feature is disabled. If you want to collect statistics on a specific field, turn on Collect Statistics, specify the field based on which you want to collect statistics, and then configure the information that is required to collect statistics.

4. Click OK.

   Data that meets the query conditions is displayed in the specified order on the Indexes tab.

You can use the Tablestore CLI to run the search command to query data by using search indexes. For more information, see Search index.

1. Run the search command to use the search_index search index to query data and return all indexed columns of each row that meets the query conditions.

   search -n search_index --return_all_indexed

2. The following sample code shows how to enter the query conditions as prompted by the system:

   {
       "Offset": -1,
       "Limit": 10,
       "Collapse": null,
       "Sort": null,
       "GetTotalCount": true,
       "Token": null,
       "Query": {
           "Name": "GeoDistanceQuery",
           "Query": {
               "FieldName": "col_geopoint",
               "CenterPoint": "35.8,-45.91",
               "DistanceInMeter": 100.0
           }
       }
   }

You can perform geo-distance queries by using Tablestore SDK for Java, Tablestore SDK for Go, Tablestore SDK for Python, Tablestore SDK for Node.js, Tablestore SDK for .NET and Tablestore SDK for PHP. In the following example, Tablestore SDK for Java is used to describe how to perform geo-distance queries.

The following sample code provides an example on how to query rows in which the value of the Col_GeoPoint column is within a specific distance from the central point.

public static void geoDistanceQuery(SyncClient client) {
    SearchQuery searchQuery = new SearchQuery();
    GeoDistanceQuery geoDistanceQuery = new GeoDistanceQuery();  // Use GeoDistanceQuery. 
    geoDistanceQuery.setFieldName("Col_GeoPoint");
    geoDistanceQuery.setCenterPoint("5,5"); // Specify the coordinates of the central point. 
    geoDistanceQuery.setDistanceInMeter(10000); // Set the distance from the central point to a value greater than or equal to 10,000. Unit: meter. 
    searchQuery.setQuery(geoDistanceQuery);
    //searchQuery.setGetTotalCount(true); // Set the GetTotalCount parameter to true to return the total number of rows that meet the query conditions. 

    SearchRequest searchRequest = new SearchRequest("<TABLE_NAME>", "<SEARCH_INDEX_NAME>", searchQuery);
    // You can use the columnsToGet parameter to specify the columns that you want to return or specify that all columns are returned. If you do not specify this parameter, only the primary key columns are returned. 
    //SearchRequest.ColumnsToGet columnsToGet = new SearchRequest.ColumnsToGet();
    //columnsToGet.setReturnAll(true); // Specify that all columns are returned. 
    //columnsToGet.setColumns(Arrays.asList("ColName1","ColName2")); // Specify the columns that you want to return. 
    //searchRequest.setColumnsToGet(columnsToGet);

    SearchResponse resp = client.search(searchRequest);
    //System.out.println("TotalCount: " + resp.getTotalCount()); // Display the total number of rows that meet the query conditions instead of the number of rows that are returned. 
    System.out.println("Row: " + resp.getRows());
}