specify hve namespace for tables (apache#5268)

(cherry picked from commit bd24f85)

superset/config.py

@@ -315,6 +315,10 @@ class CeleryConfig(object):
 # contain all the external tables
 CSV_TO_HIVE_UPLOAD_DIRECTORY = 'EXTERNAL_HIVE_TABLES/'
 
+# The namespace within hive where the tables created from
+# uploading CSVs will be stored.
+UPLOADED_CSV_HIVE_NAMESPACE = None
+
 # A dictionary of items that gets merged into the Jinja context for
 # SQL Lab. The existing context gets updated with this dictionary,
 # meaning values for existing keys get overwritten by the content of this

superset/db_engine_specs.py

@@ -910,6 +910,14 @@ def get_column_names(filepath):
                 return next(unicodecsv.reader(f, encoding='utf-8-sig'))
 
         table_name = form.name.data
+        if config.get('UPLOADED_CSV_HIVE_NAMESPACE'):
+            if '.' in table_name:
+                raise Exception(
+                    "You can't specify a namespace. "
+                    'All tables will be uploaded to the `{}` namespace'.format(
+                        config.get('HIVE_NAMESPACE')))
+            table_name = '{}.{}'.format(
+                config.get('UPLOADED_CSV_HIVE_NAMESPACE'), table_name)
         filename = form.csv_file.data.filename
 
         bucket_path = app.config['CSV_TO_HIVE_UPLOAD_S3_BUCKET']