diff --git a/setup.py b/setup.py
index 05b6620cde9f3..b4f58e2c625dc 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
         'markdown==2.6.6',
         'pandas==0.18.1',
         'parsedatetime==2.0.0',
-        'pydruid==0.3.0',
+        'pydruid==0.3.1',
         'PyHive>=0.2.1',
         'python-dateutil==2.5.3',
         'requests==2.10.0',
diff --git a/superset/cli.py b/superset/cli.py
index bd99ee66efc37..86be0a30393f9 100755
--- a/superset/cli.py
+++ b/superset/cli.py
@@ -82,13 +82,19 @@ def load_examples(load_test_data):
     help=(
         "Specify which datasource name to load, if omitted, all "
         "datasources will be refreshed"))
-def refresh_druid(datasource):
+@manager.option(
+    '-m', '--merge',
+    help=(
+        "Specify using 'merge' property during operation. "
+        "Default value is False "))
+def refresh_druid(datasource, merge):
     """Refresh druid datasources"""
     session = db.session()
     from superset import models
     for cluster in session.query(models.DruidCluster).all():
         try:
-            cluster.refresh_datasources(datasource_name=datasource)
+            cluster.refresh_datasources(datasource_name=datasource,
+                                        merge_flag=merge)
         except Exception as e:
             print(
                 "Error while processing cluster '{}'\n{}".format(
diff --git a/superset/models.py b/superset/models.py
index af7a08a11eced..4653725b76fc7 100644
--- a/superset/models.py
+++ b/superset/models.py
@@ -1602,7 +1602,7 @@ def get_druid_version(self):
         ).format(obj=self)
         return json.loads(requests.get(endpoint).text)['version']
 
-    def refresh_datasources(self, datasource_name=None):
+    def refresh_datasources(self, datasource_name=None, merge_flag=False):
         """Refresh metadata of all datasources in the cluster
 
         If ``datasource_name`` is specified, only that datasource is updated
@@ -1611,7 +1611,7 @@ def refresh_datasources(self, datasource_name=None):
         for datasource in self.get_datasources():
             if datasource not in config.get('DRUID_DATA_SOURCE_BLACKLIST'):
                 if not datasource_name or datasource_name == datasource:
-                    DruidDatasource.sync_to_db(datasource, self)
+                    DruidDatasource.sync_to_db(datasource, self, merge_flag)
 
     @property
     def perm(self):
@@ -1777,7 +1777,8 @@ def latest_metadata(self):
         try:
             segment_metadata = client.segment_metadata(
                 datasource=self.datasource_name,
-                intervals=lbound + '/' + rbound)
+                intervals=lbound + '/' + rbound,
+                merge=self.merge_flag)
         except Exception as e:
             logging.warning("Failed first attempt to get latest segment")
             logging.exception(e)
@@ -1790,7 +1791,8 @@ def latest_metadata(self):
             try:
                 segment_metadata = client.segment_metadata(
                     datasource=self.datasource_name,
-                    intervals=lbound + '/' + rbound)
+                    intervals=lbound + '/' + rbound,
+                    merge=self.merge_flag)
             except Exception as e:
                 logging.warning("Failed 2nd attempt to get latest segment")
                 logging.exception(e)
@@ -1876,7 +1878,7 @@ def sync_to_db_from_config(cls, druid_config, user, cluster):
         session.commit()
 
     @classmethod
-    def sync_to_db(cls, name, cluster):
+    def sync_to_db(cls, name, cluster, merge):
         """Fetches metadata for that datasource and merges the Superset db"""
         logging.info("Syncing Druid datasource [{}]".format(name))
         session = get_session()
@@ -1889,6 +1891,7 @@ def sync_to_db(cls, name, cluster):
             flasher("Refreshing datasource [{}]".format(name), "info")
         session.flush()
         datasource.cluster = cluster
+        datasource.merge_flag = merge
         session.flush()
 
         cols = datasource.latest_metadata()
diff --git a/tests/druid_tests.py b/tests/druid_tests.py
index 0da4b848f6c44..7a1b8da59caf1 100644
--- a/tests/druid_tests.py
+++ b/tests/druid_tests.py
@@ -100,6 +100,7 @@ def test_client(self, PyDruid):
         cluster.get_datasources = Mock(return_value=['test_datasource'])
         cluster.get_druid_version = Mock(return_value='0.9.1')
         cluster.refresh_datasources()
+        cluster.refresh_datasources(merge_flag=True)
         datasource_id = cluster.datasources[0].id
         db.session.commit()