Added 32-bit build (#27274)

Author: TomAugspurger

ci/azure/posix.yml

@@ -33,6 +33,12 @@ jobs:
           PATTERN: "not slow and not network"
           LOCALE_OVERRIDE: "it_IT.UTF-8"
 
+        py36_32bit:
+          ENV_FILE: ci/deps/azure-36-32bit.yaml
+          CONDA_PY: "36"
+          PATTERN: "not slow and not network"
+          BITS32: "yes"
+
         py37_locale:
           ENV_FILE: ci/deps/azure-37-locale.yaml
           CONDA_PY: "37"

ci/deps/azure-36-32bit.yaml

@@ -0,0 +1,20 @@
+name: pandas-dev
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - gcc_linux-32
+  - gcc_linux-32
+  - gxx_linux-32
+  - cython=0.28.2
+  - numpy=1.14.*
+  - python-dateutil
+  - python=3.6.*
+  - pytz=2017.2
+  # universal
+  - pytest>=4.0.2,<5.0.0
+  - pytest-xdist
+  - pytest-mock
+  - pytest-azurepipelines
+  - hypothesis>=3.58.0
+  - pip

ci/setup_env.sh

@@ -94,6 +94,12 @@ echo
 echo "conda env create -q --file=${ENV_FILE}"
 time conda env create -q --file="${ENV_FILE}"
 
+
+if [[ "$BITS32" == "yes" ]]; then
+    # activate 32-bit compiler
+    export CONDA_BUILD=1
+fi
+
 echo "activate pandas-dev"
 source activate pandas-dev
 

pandas/tests/groupby/test_grouping.py

@@ -616,7 +616,7 @@ def test_groupby_empty(self):
         # check group properties
         assert len(gr.grouper.groupings) == 1
         tm.assert_numpy_array_equal(
-            gr.grouper.group_info[0], np.array([], dtype=np.dtype("intp"))
+            gr.grouper.group_info[0], np.array([], dtype=np.dtype("int64"))
         )
 
         tm.assert_numpy_array_equal(