apache/druid · error · java.lang.UnsupportedOperationException

FixedBucketsHistogramAggregator does not support getDouble()

Error message

FixedBucketsHistogramAggregator does not support getDouble()

What it means

Guard thrown by FixedBucketsHistogramAggregator.getDouble(): like getLong/getFloat, double access is intentionally rejected because the aggregated value is a FixedBucketsHistogram with no single double representation. Fires when the engine requests a double-typed result from this aggregator; only get()/isNull() are supported on it.

Solutions

  1. Access the histogram via get()/ObjectResult instead of getDouble().
  2. Use a numeric aggregator if a double result is required.
Defensive patterns

Strategy: validation

When it happens

Trigger: Thrown at extensions-core/histogram/src/main/java/org/apache/druid/query/aggregation/histogram/FixedBucketsHistogramAggregator.java:94 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/druid@9b90983fd2 (2026-09-07). Data as JSON: /api/errors/94510cb1bbafad9f. Report an issue: GitHub.

Appendix: source

Thrown at extensions-core/histogram/src/main/java/org/apache/druid/query/aggregation/histogram/FixedBucketsHistogramAggregator.java:94

    return histogram;
  }

  @Override
  public float getFloat()
  {
    throw new UnsupportedOperationException("FixedBucketsHistogramAggregator does not support getFloat()");
  }

  @Override
  public long getLong()
  {
    throw new UnsupportedOperationException("FixedBucketsHistogramAggregator does not support getLong()");
  }

  @Override
  public double getDouble()
  {
    throw new UnsupportedOperationException("FixedBucketsHistogramAggregator does not support getDouble()");
  }

  @Override
  public boolean isNull()
  {
    return false;
  }

  @Override
  public void close()
  {

  }
}

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