DEPR: add deprecation warning for com.array_equivalent

pandas.core.common.array_equivalent was removed without deprecation warning.
This commits adds it back to the core.common namespace with deprecation warning

pandas/api/tests/test_api.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 
+import numpy as np
+
 import pandas as pd
 from pandas.core import common as com
 from pandas import api
@@ -181,9 +183,14 @@ def test_deprecation_core_common(self):
 
         # test that we are in fact deprecating
         # the pandas.core.common introspectors
-        for t in self.allowed:
+        for t in (self.allowed + ['array_equivalent']):
             self.check_deprecation(getattr(com, t), getattr(types, t))
 
+    def test_deprecation_core_common_array_equivalent(self):
+
+        with tm.assert_produces_warning(DeprecationWarning):
+            com.array_equivalent(np.array([1, 2]), np.array([1, 2]))
+
     def test_deprecation_core_common_moved(self):
 
         # these are in pandas.types.common

pandas/core/common.py

@@ -19,6 +19,7 @@
 from pandas.types.missing import isnull
 from pandas.api import types
 from pandas.types import common
+from pandas.util.decorators import deprecate
 
 # back-compat of public API
 # deprecate these functions
@@ -64,6 +65,15 @@ def wrapper(*args, **kwargs):
     setattr(m, t, outer(t))
 
 
+# deprecate array_equivalent
+
+def array_equivalent(*args, **kwargs):
+    warnings.warn("'pandas.core.common.array_equivalent' is deprecated and "
+                  "is no longer public API", DeprecationWarning, stacklevel=2)
+    from pandas.types import missing
+    return missing.array_equivalent(*args, **kwargs)
+
+
 class PandasError(Exception):
     pass