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Big data & Spark

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

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Big data & Spark easy

How to Mock a User-Defined Function (UDF) in Python

Wrap a real UDF implementation with call logging to simulate and track invocations in a data pipeline.

udf mock testing
Python 
from typing import Any, Callable


# Mock a user-defined function (UDF) that was previously complex or external
def mock_udf(name: str, implementation: Callable[..., Any], *, calls: list[Any]) -> Callable[..., Any]:
    """Wrap a real implementation with call logging to simulate a UDF."""
    def wrapper(*args: Any, *…
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