feat: Support window partition by geo column (#1512)

Author: TrevorBergeron

bigframes/core/compile/compiled.py

@@ -665,9 +665,11 @@ def _join_condition(
 
 
 def _as_groupable(value: ibis_types.Value):
-    # Some types need to be converted to string to enable groupby
-    if value.type().is_float64() or value.type().is_geospatial():
+    # Some types need to be converted to another type to enable groupby
+    if value.type().is_float64():
         return value.cast(ibis_dtypes.str)
+    elif value.type().is_geospatial():
+        return typing.cast(ibis_types.GeoSpatialColumn, value).as_binary()
     elif value.type().is_json():
         return scalar_op_compiler.to_json_string(value)
     else:

tests/system/small/geopandas/test_geoseries.py

@@ -289,3 +289,20 @@ def test_geo_difference_with_similar_geometry_objects():
     assert expected.iloc[0].equals(bf_result.iloc[0])
     assert expected.iloc[1].equals(bf_result.iloc[1])
     assert expected.iloc[2].equals(bf_result.iloc[2])
+
+
+def test_geo_drop_duplicates():
+    bf_series = bigframes.geopandas.GeoSeries(
+        [Point(1, 1), Point(2, 2), Point(3, 3), Point(2, 2)]
+    )
+
+    pd_series = geopandas.GeoSeries(
+        [Point(1, 1), Point(2, 2), Point(3, 3), Point(2, 2)]
+    )
+
+    bf_result = bf_series.drop_duplicates().to_pandas()
+    pd_result = pd_series.drop_duplicates()
+
+    pd.testing.assert_series_equal(
+        geopandas.GeoSeries(bf_result), pd_result, check_index=False
+    )