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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 UDAF Aggregate Function in Python

This code provides a minimal mock of a User-Defined Aggregate Function (UDAF), simulating the initialize-update-merge-finalize lifecycle with a defaultdict counter.

udaf aggregate mock
Python 
from collections import defaultdict

class MockUDAF:
    """A minimal mock of a User-Defined Aggregate Function.

    Simulates aggregate lifecycle: initialize, update per row,
    and finalize the result.
    """

    def __init__(self):
        self._buffer = defaultdict(int)

    def initialize(self):
        """Re…
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