prestodb/presto · error · UnsupportedOperationException

In differential_entropy UDF, unsupported arguments for type:

Error message

In differential_entropy UDF, unsupported arguments for type: %s

What it means

Default (unsupported) implementation of validateParameters on a differential_entropy state strategy: the concrete strategy variant cannot interpret the given combination of size/sample/weight/min/max arguments, so parameter validation itself is rejected for this strategy type.

Source

Thrown at presto-main-base/src/main/java/com/facebook/presto/operator/aggregation/differentialentropy/DifferentialEntropyStateStrategy.java:163

    void mergeWith(DifferentialEntropyStateStrategy other);

    DifferentialEntropyStateStrategy clone();

    default void validateParameters(long size, double sample, double weight, double min, double max)
    {
        throw new UnsupportedOperationException(
                format("In differential_entropy UDF, unsupported arguments for type: %s", getClass().getSimpleName()));
    }

    default void validateParameters(long size, double sample, double weight)
    {
        throw new UnsupportedOperationException(
                format("In differential_entropy UDF, unsupported arguments for type: %s", getClass().getSimpleName()));
    }

    default void validateParameters(long size, double sample)
    {
        throw new UnsupportedOperationException(
                format("In differential_entropy UDF, unsupported arguments for type: %s", getClass().getSimpleName()));
    }

    static void serialize(DifferentialEntropyStateStrategy strategy, SliceOutput sliceOut)
    {
        sliceOut.appendInt(DifferentialEntropyStateStrategy.class.getSimpleName().hashCode());
        if (strategy == null) {
            sliceOut.appendInt(0);
            return;
        }

        if (strategy instanceof UnweightedReservoirSampleStateStrategy) {
            sliceOut.appendInt(1);
        }
        else if (strategy instanceof WeightedReservoirSampleStateStrategy) {
            sliceOut.appendInt(2);
        }
        else if (strategy instanceof FixedHistogramMleStateStrategy) {

View on GitHub (pinned to 55bb57d202)

Solutions

1. Supply the full parameter set (bucket size, sample, weight, min, max) that this strategy requires
2. Choose a strategy/method whose parameter signature matches your call
3. Check the differential_entropy documentation for per-method required arguments

When it happens

Trigger: Thrown at presto-main-base/src/main/java/com/facebook/presto/operator/aggregation/differentialentropy/DifferentialEntropyStateStrategy.java:163 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/167dd38366999404. Report an issue: GitHub.