Function MakeInnerOptions

python/pyarrow/src/arrow/python/arrow_to_pandas.cc:74–92

Fix options for conversion of an inner (child) array.

// Fix options for conversion of an inner (child) array.
PandasOptions MakeInnerOptions(PandasOptions options) {
  // Make sure conversion of inner dictionary arrays always returns an array,
  // not a dict {'indices': array, 'dictionary': array, 'ordered': bool}
  options.decode_dictionaries = true;
  options.categorical_columns.reset();
  options.strings_to_categorical = false;

  // In ARROW-7723, we found as a result of ARROW-3789 that second
  // through microsecond resolution tz-aware timestamps were being promoted to
  // use the DATETIME_NANO_TZ conversion path, yielding a datetime64[ns] NumPy
  // array in this function. PyArray_GETITEM returns datetime.datetime for
  // units second through microsecond but PyLong for nanosecond (because
  // datetime.datetime does not support nanoseconds).
  // We force the object conversion to preserve the value of the timezone.
  // Nanoseconds are returned as integers.
  options.coerce_temporal_nanoseconds = false;

  return options;
}

// ----------------------------------------------------------------------
// PyCapsule code for setting ndarray base to reference C++ object