Package io.airlift.stats.cardinality

Examples of io.airlift.stats.cardinality.HyperLogLog

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        state.addMemoryUsage(hll.estimatedInMemorySize());
    }

    private static HyperLogLog getOrCreateHyperLogLog(HyperLogLogState state)
    {
        HyperLogLog hll = state.getHyperLogLog();
        if (hll == null) {
            hll = HyperLogLog.newInstance(NUMBER_OF_BUCKETS);
            state.setHyperLogLog(hll);
            state.addMemoryUsage(hll.estimatedInMemorySize());
        }
        return hll;
    }
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    }

    @CombineFunction
    public static void combineState(HyperLogLogState state, HyperLogLogState otherState)
    {
        HyperLogLog input = otherState.getHyperLogLog();

        HyperLogLog previous = state.getHyperLogLog();
        if (previous == null) {
            state.setHyperLogLog(input);
            state.addMemoryUsage(input.estimatedInMemorySize());
        }
        else {
            state.addMemoryUsage(-previous.estimatedInMemorySize());
            previous.mergeWith(input);
            state.addMemoryUsage(previous.estimatedInMemorySize());
        }
    }
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    @InputFunction
    @IntermediateInputFunction
    public static void merge(HyperLogLogState state, @SqlType(StandardTypes.HYPER_LOG_LOG) Slice value)
    {
        HyperLogLog input = HyperLogLog.newInstance(value);

        HyperLogLog previous = state.getHyperLogLog();
        if (previous == null) {
            state.setHyperLogLog(input);
            state.addMemoryUsage(input.estimatedInMemorySize());
        }
        else {
            state.addMemoryUsage(-previous.estimatedInMemorySize());
            previous.mergeWith(input);
            state.addMemoryUsage(previous.estimatedInMemorySize());
        }
    }
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    @ScalarFunction
    @SqlType(HyperLogLogType.class)
    public static Slice createHll(@SqlType(BigintType.class) long value)
    {
        HyperLogLog hll = HyperLogLog.newInstance(4096);
        hll.add(value);
        return hll.serialize();
    }
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    @ScalarFunction
    @SqlType(HyperLogLogType.class)
    public static Slice createHll(@SqlType(BigintType.class) long value)
    {
        HyperLogLog hll = HyperLogLog.newInstance(4096);
        hll.add(value);
        return hll.serialize();
    }
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Related Classes of io.airlift.stats.cardinality.HyperLogLog

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  • com.facebook.presto.operator.aggregation.ApproximateSetAggregation$ApproximateSetAccumulator
  • com.facebook.presto.operator.aggregation.ApproximateSetAggregation$ApproximateSetGroupedAccumulator
  • com.facebook.presto.operator.aggregation.MergeHyperLogLogAggregation
  • com.facebook.presto.operator.aggregation.MergeHyperLogLogAggregation$MergeHyperLogLogAccumulator
  • com.facebook.presto.operator.aggregation.MergeHyperLogLogAggregation$MergeHyperLogLogGroupedAccumulator
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  • com.facebook.presto.tests.CreateHll
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