ASV: add benchmark for reindex with MultiIndex containing dates (#47221)

Author: lukemanley

asv_bench/benchmarks/reindex.py

@@ -30,6 +30,10 @@ def setup(self):
         self.s_subset = self.s[::2]
         self.s_subset_no_cache = self.s[::2].copy()
 
+        mi = MultiIndex.from_product([rng, range(100)])
+        self.s2 = Series(np.random.randn(len(mi)), index=mi)
+        self.s2_subset = self.s2[::2].copy()
+
     def time_reindex_dates(self):
         self.df.reindex(self.rng_subset)
 
@@ -44,6 +48,10 @@ def time_reindex_multiindex_no_cache(self):
         # Copy to avoid MultiIndex._values getting cached
         self.s.reindex(self.s_subset_no_cache.index.copy())
 
+    def time_reindex_multiindex_no_cache_dates(self):
+        # Copy to avoid MultiIndex._values getting cached
+        self.s2_subset.reindex(self.s2.index.copy())
+
 
 class ReindexMethod: