petastorm/etl/rowgroup_indexers.py [59:66]:
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    def build_index(self, decoded_rows, piece_index):
        field_column = [row[self._column_name] for row in decoded_rows]
        if not field_column:
            raise ValueError("Cannot build index for empty rows, column '{}'"
                             .format(self._column_name))

        for field_val in field_column:
            if field_val is not None:
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petastorm/etl/rowgroup_indexers.py [113:120]:
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    def build_index(self, decoded_rows, piece_index):
        field_column = [row[self._column_name] for row in decoded_rows]
        if not field_column:
            raise ValueError("Cannot build index for empty rows, column '{}'"
                             .format(self._column_name))

        for field_val in field_column:
            if field_val is not None:
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