add dict for datasource as sub_query return dict (#179)

* add dict for datasource as sub_query return dict

* add dict for datasource as sub_query return dict

* add dict for datasource as sub_query return dict

Co-authored-by: lavanya <lavanya@dataglen.com>

pydruid/query.py

@@ -235,17 +235,20 @@ def parse_datasource(datasource, query_type):
 
         :param datasource: datasource parameter
         :param string query_type: query type
-        :raise ValueError: if input is not string or list of strings
+        :raise ValueError: if input is not string or list of strings or dict
         """
         if not (
             isinstance(datasource, six.string_types)
             or (
                 isinstance(datasource, list)
                 and all([isinstance(x, six.string_types) for x in datasource])
             )
+            or
+            isinstance(datasource, dict)
         ):
             raise ValueError(
-                "Datasource definition not valid. Must be string or list of strings"
+                "Datasource definition not valid. Must be string or "
+                "dict or list of strings"
             )
         if isinstance(datasource, six.string_types):
             return datasource