Examples with NEW com.facebook.presto.operator.aggregation.histogram.HistogramGroupImplementation.NEW used on opensource projects

Example 1 with NEW

use of com.facebook.presto.operator.aggregation.histogram.HistogramGroupImplementation.NEW in project presto by prestodb.

the class TestHistogram method testManyValuesInducingRehash.

private void testManyValuesInducingRehash(InternalAggregationFunction aggregationFunction) {
    double distinctFraction = 0.1f;
    int numGroups = 50000;
    int itemCount = 30;
    Random random = new Random();
    GroupedAccumulator groupedAccumulator = createGroupedAccumulator(aggregationFunction);
    for (int j = 0; j < numGroups; j++) {
        Map<String, Long> expectedValues = new HashMap<>();
        List<String> valueList = new ArrayList<>();
        for (int i = 0; i < itemCount; i++) {
            String str = String.valueOf(i % 10);
            String item = IntStream.range(0, itemCount).mapToObj(x -> str).collect(Collectors.joining());
            boolean distinctValue = random.nextDouble() < distinctFraction;
            if (distinctValue) {
                // produce a unique value for the histogram
                item = j + "-" + item;
                valueList.add(item);
            } else {
                valueList.add(item);
            }
            expectedValues.compute(item, (k, v) -> v == null ? 1L : ++v);
        }
        Block block = createStringsBlock(valueList);
        AggregationTestInputBuilder testInputBuilder = new AggregationTestInputBuilder(new Block[] { block }, aggregationFunction);
        AggregationTestInput test1 = testInputBuilder.build();
        test1.runPagesOnAccumulatorWithAssertion(j, groupedAccumulator, new AggregationTestOutput(expectedValues));
    }
}