REF: Special case NumericIndex._append_same_dtype()

Author: toobaz

pandas/core/dtypes/concat.py

@@ -472,6 +472,10 @@ def _concat_datetimetz(to_concat, name=None):
     return to_concat[0]._simple_new(new_values, tz=tz, name=name)
 
 
+def _concat_index_same_dtype(indexes):
+    return indexes[0].__class__(np.concatenate([x._values for x in indexes]))
+
+
 def _concat_index_asobject(to_concat, name=None):
     """
     concat all inputs as object. DatetimeIndex, TimedeltaIndex and

pandas/core/indexes/numeric.py

@@ -17,6 +17,7 @@
 from pandas.core.indexes.base import (
     Index, InvalidIndexError, _index_shared_docs)
 from pandas.util._decorators import Appender, cache_readonly
+import pandas.core.dtypes.concat as _concat
 import pandas.core.indexes.base as ibase
 
 
@@ -87,6 +88,9 @@ def _assert_safe_casting(cls, data, subarr):
         """
         pass
 
+    def _concat_same_dtype(self, indexes, name):
+        return _concat._concat_index_same_dtype(indexes).rename(name)
+
     @property
     def is_all_dates(self):
         """