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Big data & Spark

PySpark jobs, partitioning, batch processing, and large-dataset transform patterns.

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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.

parquet pyarrow partition
Python 
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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