ExtensionArray.shift incorrect for periods larger than length of array #23911
Description
In [9]: from pandas.tests.extension.decimal import to_decimal In [10]: to_decimal([1, 2]).shift(4) Out[10]: DecimalArray(array([Decimal('NaN'), Decimal('NaN'), Decimal('NaN'), Decimal('NaN')], dtype=object))The expected output is
>>> to_decimal(['NaN', 'NaN']) DecimalArray(array([Decimal('NaN'), Decimal('NaN')], dtype=object))similar to categorical
In [12]: pd.Categorical([1, 2]).shift(4) Out[12]: [NaN, NaN] Categories (2, int64): [1, 2]This will need a new base test in tests/extension/base/methods.py and a fix in
pandas/pandas/core/arrays/base.py
Line 430 in a7b187a