Replace c extension with cython versions.workflow_test_cython

Re-implement c version immutabledict / processors / resultproxy / utils with cython.
Performance is in general in par or better than the c version
Added a collection module that has cython version of OrderedSet and IdentitySet

Added a new test/perf file to compare the implementations.
Run ``python test/perf/compiled_extensions.py all`` to execute the comparison test.

See results here: https://docs.google.com/document/d/1nOcDGojHRtXEkuy4vNXcW_XOJd9gqKhSeALGG3kYr6A/edit?usp=sharing

Fixes: #7256
Change-Id: I2930ef1894b5048210384728118e586e813f6a76
Signed-off-by: Federico Caselli <cfederico87@gmail.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/sqlalchemy/engine/_py_util.py b/lib/sqlalchemy/engine/_py_util.py
new file mode 100644
index 000000000..2db6c049b
--- /dev/null
+++ b/lib/sqlalchemy/engine/_py_util.py
@@ -0,0 +1,54 @@
+from collections import abc as collections_abc
+
+from .. import exc
+
+_no_tuple = ()
+
+
+def _distill_params_20(params):
+    if params is None:
+        return _no_tuple
+    # Assume list is more likely than tuple
+    elif isinstance(params, list) or isinstance(params, tuple):
+        # collections_abc.MutableSequence): # avoid abc.__instancecheck__
+        if params and not isinstance(
+            params[0], (tuple, collections_abc.Mapping)
+        ):
+            raise exc.ArgumentError(
+                "List argument must consist only of tuples or dictionaries"
+            )
+
+        return params
+    elif isinstance(params, dict) or isinstance(
+        # only do immutabledict or abc.__instancecheck__ for Mapping after
+        # we've checked for plain dictionaries and would otherwise raise
+        params,
+        collections_abc.Mapping,
+    ):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or list expected for parameters")
+
+
+def _distill_raw_params(params):
+    if params is None:
+        return _no_tuple
+    elif isinstance(params, list):
+        # collections_abc.MutableSequence): # avoid abc.__instancecheck__
+        if params and not isinstance(
+            params[0], (tuple, collections_abc.Mapping)
+        ):
+            raise exc.ArgumentError(
+                "List argument must consist only of tuples or dictionaries"
+            )
+
+        return params
+    elif isinstance(params, (tuple, dict)) or isinstance(
+        # only do abc.__instancecheck__ for Mapping after we've checked
+        # for plain dictionaries and would otherwise raise
+        params,
+        collections_abc.Mapping,
+    ):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or sequence expected for parameters")