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How to Mock a Parquet partitionBy Sink in Python

Manually write a DataFrame to partitioned Parquet files, mimicking Spark's partitionBy sink behavior without Spark.

import pyarrow as pa
import pyarrow.parquet as pq
from pathlib import Path
import tempfile
import shutil


def mock_partition_by_sink(data, output_dir, partition_cols):
    table = pa.Table.from_pandas(data)
    schema = table.schema
    unique_combos = table.select(partition_cols).to_pylist()
    seen = set()
    for…

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