code sample for pandas-dev#45661

Author: simonjayhawkins

bisect/45661.py

@@ -0,0 +1,22 @@
+# BUG: join operation fails on overlapping IntervalIndex levels #45661
+
+import pandas as pd
+
+print(pd.__version__)
+
+range_index = pd.RangeIndex(3, name="range_index")
+interval_index = pd.IntervalIndex.from_tuples(
+    [(0.0, 1.0), (1.0, 2.0), (1.5, 2.5)], name="interval_index"
+)
+multi_index = pd.MultiIndex.from_product([interval_index, range_index])
+
+result = interval_index.join(multi_index)
+print(result)
+
+pd.testing.assert_index_equal(result, multi_index)
+
+# This causes the same issue
+result = multi_index.join(interval_index)
+print(result)
+
+pd.testing.assert_index_equal(result, multi_index)