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, 43 insertions, 0 deletions

diff --git a/lib/sqlalchemy/cyextension/util.pyx b/lib/sqlalchemy/cyextension/util.pyx
new file mode 100644
index 000000000..ac15ff9de
--- /dev/null
+++ b/lib/sqlalchemy/cyextension/util.pyx
@@ -0,0 +1,43 @@
+from collections.abc import Mapping
+
+from sqlalchemy import exc
+
+cdef tuple _Empty_Tuple = ()
+
+cdef inline bint _mapping_or_tuple(object value):
+    return isinstance(value, dict) or isinstance(value, tuple) or isinstance(value, Mapping)
+
+cdef inline bint _check_item(object params) except 0:
+    cdef object item
+    cdef bint ret = 1
+    if params:
+        item = params[0]
+        if not _mapping_or_tuple(item):
+            ret = 0
+            raise exc.ArgumentError(
+                "List argument must consist only of tuples or dictionaries"
+            )
+    return ret
+
+def _distill_params_20(object params):
+    if params is None:
+        return _Empty_Tuple
+    elif isinstance(params, list) or isinstance(params, tuple):
+        _check_item(params)
+        return params
+    elif isinstance(params, dict) or isinstance(params, Mapping):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or list expected for parameters")
+
+
+def _distill_raw_params(object params):
+    if params is None:
+        return _Empty_Tuple
+    elif isinstance(params, list):
+        _check_item(params)
+        return params
+    elif _mapping_or_tuple(params):
+        return [params]
+    else:
+        raise exc.ArgumentError("mapping or sequence expected for parameters")