Add benchmark for indexing with .loc for sorted/unsorted DatetimeIndex (pandas-dev#46198)

* add benchmark

* add

* add benchmark

* add

* add

* add

Author: Khor Chean Wei

asv_bench/benchmarks/indexing.py

@@ -290,20 +290,26 @@ def setup(self):
         self.dti = dti
         self.dti2 = dti2
 
-        index = np.random.choice(dti, 10000, replace=True)
-        df = DataFrame(index=index, data={"a": 1})
-        df_sort = df.sort_index()
-        self.df = df
-        self.df_sort = df_sort
-
     def time_get_indexer_mismatched_tz(self):
         # reached via e.g.
         #  ser = Series(range(len(dti)), index=dti)
         #  ser[dti2]
         self.dti.get_indexer(self.dti2)
 
+
+class SortedAndUnsortedDatetimeIndexLoc:
+    def setup(self):
+        dti = date_range("2016-01-01", periods=10000, tz="US/Pacific")
+        index = np.array(dti)
+
+        unsorted_index = index.copy()
+        unsorted_index[10] = unsorted_index[20]
+
+        self.df_unsorted = DataFrame(index=unsorted_index, data={"a": 1})
+        self.df_sort = DataFrame(index=index, data={"a": 1})
+
     def time_loc_unsorted(self):
-        self.df.loc["2016-6-11"]
+        self.df_unsorted.loc["2016-6-11"]
 
     def time_loc_sorted(self):
         self.df_sort.loc["2016-6-11"]