read_builder.py

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from abc import ABC, abstractmethod
from paimon_python_api import TableRead, TableScan, Predicate, PredicateBuilder
from typing import List


class ReadBuilder(ABC):
    """An interface for building the TableScan and TableRead."""

    @abstractmethod
    def with_filter(self, predicate: Predicate):
        """
        Push filters, will filter the data as much as possible,
        but it is not guaranteed that it is a complete filter.
        """

    @abstractmethod
    def with_projection(self, projection: List[str]) -> 'ReadBuilder':
        """Push nested projection."""

    @abstractmethod
    def with_limit(self, limit: int) -> 'ReadBuilder':
        """Push row number."""

    @abstractmethod
    def new_scan(self) -> TableScan:
        """Create a TableScan to perform batch planning."""

    @abstractmethod
    def new_read(self) -> TableRead:
        """Create a TableRead to read splits."""

    @abstractmethod
    def new_predicate_builder(self) -> PredicateBuilder:
        """Create a builder for Predicate."""