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import pyarrow as pa

from pypaimon.write.writer.data_writer import DataWriter


class AppendOnlyDataWriter(DataWriter):
    """Data writer for append-only tables."""

    def _process_data(self, data: pa.RecordBatch) -> pa.Table:
        return pa.Table.from_batches([data])

    def _merge_data(self, existing_data: pa.Table, new_data: pa.Table) -> pa.Table:
        return pa.concat_tables([existing_data, new_data])
