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from abc import ABC, abstractmethod

from typing import Iterator


class Split(ABC):
    """An input split for reading. The most important subclass is DataSplit."""

    @abstractmethod
    def row_count(self) -> int:
        """Return the total row count of the split."""

    def file_size(self) -> int:
        """Return the total file size of the split."""

    def file_paths(self) -> Iterator[str]:
        """Return the paths of all raw files in the split."""