Revert "Merge "add aiomysql support""

This reverts commit 23343f87f3297ad31d7315ac0e5312db10ef7592, reversing
changes made to c5831b1abd98c46ef7eab7ee82ead18756aea112.

The crashes that occur in jenkins have not been solved and are
now impacting master.   I am not able to reproduce the failure,
including running on the CI machines directly, and a few runs
where I sat there for 20 minutes and watched, it didn't happen.
it is the ultimate heisenbug.

Additionally, there's a reference to "arraysize" that doesn't
exist in fetchmany() and there seem to be no tests that exercise
this for any DBAPI which is also a major bug to be fixed.

References: #5747

1 files changed, 3 insertions, 10 deletions

diff --git a/lib/sqlalchemy/ext/asyncio/result.py b/lib/sqlalchemy/ext/asyncio/result.py
index 9c7e0420f..7f8a707d5 100644
--- a/lib/sqlalchemy/ext/asyncio/result.py
+++ b/lib/sqlalchemy/ext/asyncio/result.py
@@ -17,14 +17,7 @@ if util.TYPE_CHECKING:
     from ...engine.result import Row
 
 
-class AsyncCommon(FilterResult):
-    async def close(self):
-        """Close this result."""
-
-        await greenlet_spawn(self._real_result.close)
-
-
-class AsyncResult(AsyncCommon):
+class AsyncResult(FilterResult):
     """An asyncio wrapper around a :class:`_result.Result` object.
 
     The :class:`_asyncio.AsyncResult` only applies to statement executions that
@@ -377,7 +370,7 @@ class AsyncResult(AsyncCommon):
         return AsyncMappingResult(self._real_result)
 
 
-class AsyncScalarResult(AsyncCommon):
+class AsyncScalarResult(FilterResult):
     """A wrapper for a :class:`_asyncio.AsyncResult` that returns scalar values
     rather than :class:`_row.Row` values.
 
@@ -507,7 +500,7 @@ class AsyncScalarResult(AsyncCommon):
         return await greenlet_spawn(self._only_one_row, True, True, False)
 
 
-class AsyncMappingResult(AsyncCommon):
+class AsyncMappingResult(FilterResult):
     """A wrapper for a :class:`_asyncio.AsyncResult` that returns dictionary values
     rather than :class:`_engine.Row` values.