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Cannot load the dataset split (in streaming mode) to extract the first rows.
Error code:   StreamingRowsError
Exception:    TypeError
Message:      Couldn't cast array of type
struct<top_etfs: list<item: struct<ticker: string, signal: double, best_window: int64>>, full_scores: struct<TLT: struct<score: double, best_window: int64>, VCIT: struct<score: double, best_window: int64>, LQD: struct<score: double, best_window: int64>, HYG: struct<score: double, best_window: int64>, VNQ: struct<score: double, best_window: int64>, GLD: struct<score: double, best_window: int64>, SLV: struct<score: double, best_window: int64>>, window_results: struct<63: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 252: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 504: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 1008: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 2016: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>>, run_date: timestamp[s]>
to
{'top_etfs': List({'ticker': Value('string'), 'signal': Value('float64')}), 'full_scores': {'VNQ': Value('float64'), 'TLT': Value('float64'), 'GLD': Value('float64')}, 'details': {'TLT': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'VCIT': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'LQD': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'HYG': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'VNQ': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'GLD': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'SLV': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}}, 'run_date': Value('timestamp[s]')}
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/utils.py", line 147, in get_rows_or_raise
                  return get_rows(
                      dataset=dataset,
                  ...<4 lines>...
                      column_names=column_names,
                  )
                File "/src/libs/libcommon/src/libcommon/utils.py", line 272, in decorator
                  return func(*args, **kwargs)
                File "/src/services/worker/src/worker/utils.py", line 127, in get_rows
                  rows_plus_one = list(itertools.islice(safe_iter(ds, dataset=dataset), rows_max_number + 1))
                File "/src/services/worker/src/worker/utils.py", line 478, in safe_iter
                  yield from ds.decode(False) if ds.features else ds
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2818, in __iter__
                  for key, example in ex_iterable:
                                      ^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2355, in __iter__
                  for key, pa_table in self._iter_arrow():
                                       ~~~~~~~~~~~~~~~~^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2380, in _iter_arrow
                  for key, pa_table in self.ex_iterable._iter_arrow():
                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 536, in _iter_arrow
                  for key, pa_table in iterator:
                                       ^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 419, in _iter_arrow
                  for key, pa_table in self.generate_tables_fn(**gen_kwags):
                                       ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 343, in _generate_tables
                  self._cast_table(pa_table, json_field_paths=json_field_paths),
                  ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
                  pa_table = table_cast(pa_table, self.info.features.arrow_schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2369, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2303, in cast_table_to_schema
                  cast_array_to_feature(
                  ~~~~~~~~~~~~~~~~~~~~~^
                      table[name] if name in table_column_names else pa.array([None] * len(table), type=schema.field(name).type),
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      feature,
                      ^^^^^^^^
                  )
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1852, in wrapper
                  return pa.chunked_array([func(chunk, *args, **kwargs) for chunk in array.chunks])
                                           ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2059, in cast_array_to_feature
                  _c(array.field(name) if name in array_fields else null_array, subfeature)
                  ~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1854, in wrapper
                  return func(array, *args, **kwargs)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2149, in cast_array_to_feature
                  raise TypeError(f"Couldn't cast array of type\n{_short_str(array.type)}\nto\n{_short_str(feature)}")
              TypeError: Couldn't cast array of type
              struct<top_etfs: list<item: struct<ticker: string, signal: double, best_window: int64>>, full_scores: struct<TLT: struct<score: double, best_window: int64>, VCIT: struct<score: double, best_window: int64>, LQD: struct<score: double, best_window: int64>, HYG: struct<score: double, best_window: int64>, VNQ: struct<score: double, best_window: int64>, GLD: struct<score: double, best_window: int64>, SLV: struct<score: double, best_window: int64>>, window_results: struct<63: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 252: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 504: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 1008: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>, 2016: struct<TLT: double, VCIT: double, LQD: double, HYG: double, VNQ: double, GLD: double, SLV: double>>, run_date: timestamp[s]>
              to
              {'top_etfs': List({'ticker': Value('string'), 'signal': Value('float64')}), 'full_scores': {'VNQ': Value('float64'), 'TLT': Value('float64'), 'GLD': Value('float64')}, 'details': {'TLT': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'VCIT': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'LQD': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'HYG': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'VNQ': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'GLD': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}, 'SLV': {'signal': Value('float64'), 'drift': Value('float64'), 'target': Value('float64'), 'current': Value('float64'), 'days_to_target': Value('int64'), 'volatility': Value('float64')}}, 'run_date': Value('timestamp[s]')}

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