[presto] Removing patched presto (#4530)

superset/db_engine_specs.py

@@ -541,12 +541,6 @@ class PrestoEngineSpec(BaseEngineSpec):
               "date_add('day', 1, CAST({col} AS TIMESTAMP))))"),
     )
 
-    @classmethod
-    def patch(cls):
-        from pyhive import presto
-        from superset.db_engines import presto as patched_presto
-        presto.Cursor.cancel = patched_presto.cancel
-
     @classmethod
     def adjust_database_uri(cls, uri, selected_schema=None):
         database = uri.database

superset/db_engines/presto.py

@@ -1,27 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-from __future__ import unicode_literals
-
-from pyhive import presto
-
-
-# TODO(bogdan): Remove this when new pyhive release will be available.
-def cancel(self):
-    if self._state == self._STATE_NONE:
-        raise presto.ProgrammingError('No query yet')
-    if self._nextUri is None:
-        assert self._state == self._STATE_FINISHED, \
-            'Should be finished if nextUri is None'
-        return
-
-    response = presto.requests.delete(self._nextUri)
-
-    # pylint: disable=no-member
-    if response.status_code != presto.requests.codes.no_content:
-        fmt = 'Unexpected status code after cancel {}\n{}'
-        raise presto.OperationalError(
-            fmt.format(response.status_code, response.content))
-    self._state = self._STATE_FINISHED
-    return