Added default database name to headers

Author: chernser

clickhouse-http-client/src/main/java/com/clickhouse/client/http/ClickHouseHttpProto.java

@@ -33,6 +33,12 @@ public class ClickHouseHttpProto {
      */
     public static final String HEADER_PROGRESS = "X-ClickHouse-Progress";
 
+
+    /**
+     * Name of default database to be used if not specified in a table name.
+     */
+    public static final String HEADER_DATABASE = "X-ClickHouse-Database";
+
     /**
      * Query parameter to specify the query ID.
      */

client-v2/src/main/java/com/clickhouse/client/api/internal/HttpAPIClientHelper.java

@@ -149,6 +149,7 @@ private void addHeaders(HttpPost req, Map<String, String> chConfig, Map<String,
                 req.addHeader(ClickHouseHttpProto.HEADER_FORMAT, requestConfig.get(ClickHouseClientOption.FORMAT.getKey()));
             }
         }
+        req.addHeader(ClickHouseHttpProto.HEADER_DATABASE, chConfig.get(ClickHouseClientOption.DATABASE.getKey()));
     }
     private void addQueryParams(URIBuilder req, Map<String, String> chConfig, Map<String, Object> requestConfig) {
         if (requestConfig != null) {