Revert: Revert incorrect fix for empty index in _pd_index_to_array_value

Author: shuoweil

bigframes/core/blocks.py

@@ -3474,27 +3474,7 @@ def _pd_index_to_array_value(
     Create an ArrayValue from a list of label tuples.
     The last column will be row offsets.
     """
-    if index.empty:
-        id_gen = bigframes.core.identifiers.standard_id_strings()
-        col_ids = [next(id_gen) for _ in range(index.nlevels + 1)]
-
-        data_dict = {}
-        if isinstance(index, pd.MultiIndex):
-            dtypes = index.dtypes.values.tolist()
-        else:
-            dtypes = [index.dtype]
 
-        for col_id, dtype in zip(col_ids[:-1], dtypes):
-            try:
-                bf_dtype = bigframes.dtypes.bigframes_type(dtype)
-                pa_type = bigframes.dtypes.bigframes_dtype_to_arrow_dtype(bf_dtype)
-            except TypeError:
-                pa_type = pa.string()
-            data_dict[col_id] = pa.array([], type=pa_type)
-
-        data_dict[col_ids[-1]] = pa.array([], type=pa.int64())
-        table = pa.Table.from_pydict(data_dict)
-        return core.ArrayValue.from_pyarrow(table, session=session)
     rows = []
     labels_as_tuples = utils.index_as_tuples(index)
     for row_offset in range(len(index)):