How to use

org.apache.druid.query.aggregation.cardinality.CardinalityAggregatorFactory

constructor

@Override
public List<AggregatorFactory> getRequiredColumns()
{
 return fields.stream()
        .map(
          field ->
            new CardinalityAggregatorFactory(
              field.getOutputName(),
              null,
              Collections.singletonList(field),
              byRow,
              round
            )
        )
        .collect(Collectors.toList());
}

ImmutableMap.of(
  "uniques",
  new CardinalityAggregatorFactory(
    "uniques",
    null,

aggregatorFactory = new CardinalityAggregatorFactory(
  aggregatorName,
  null,

.intervals(QueryRunnerTestHelper.firstToThird)
.aggregators(duplicateAggregators(
  new CardinalityAggregatorFactory("numVals", aggregatorDimensionSpecs, false),
  new CardinalityAggregatorFactory("numVals1", aggregatorDimensionSpecs, false)
))
.build();

@Test
public void testSerde() throws Exception
 CardinalityAggregatorFactory factory = new CardinalityAggregatorFactory(
   "billy",
   null,
 );
 CardinalityAggregatorFactory factory2 = new CardinalityAggregatorFactory(
   "billy",
   ImmutableList.of(

AGGS(
  new FilteredAggregatorFactory(
    new CardinalityAggregatorFactory(
      "a0",
      null,
  ),
  new FilteredAggregatorFactory(
    new CardinalityAggregatorFactory(
      "a1",
      null,

CardinalityAggregatorFactory factory = new CardinalityAggregatorFactory(
  "billy",
  Collections.singletonList(new DefaultDimensionSpec("dim1", "dim1")),

AGGS(
  new LongSumAggregatorFactory("a0", "cnt"),
  new CardinalityAggregatorFactory(
    "a1",
    null,
  ),
  new FilteredAggregatorFactory(
    new CardinalityAggregatorFactory(
      "a2",
      null,
    NOT(SELECTOR("dim2", "", null))
  ),
  new CardinalityAggregatorFactory(
    "a3",
    null,
    true
  ),
  new CardinalityAggregatorFactory(
    "a4",
    null,

.intervals(QueryRunnerTestHelper.firstToThird)
.aggregators(duplicateAggregators(
  new CardinalityAggregatorFactory("numVals", aggregatorDimensionSpecs, false),
  new CardinalityAggregatorFactory("numVals1", aggregatorDimensionSpecs, false)
))
.build();

.granularity(Granularities.ALL)
.aggregators(AGGS(
  new CardinalityAggregatorFactory(
    "a0",
    null,

.aggregators(
  AGGS(
    new CardinalityAggregatorFactory(
      "a0",
      null,

AGGS(
  new LongSumAggregatorFactory("a0", "cnt"),
  new CardinalityAggregatorFactory(
    "a1",
    null,

.setAggregatorSpecs(
  AGGS(
    new CardinalityAggregatorFactory(
      "a0",
      null,

@Test
public void testSubqueryWithOuterCardinalityAggregator()
{
 final GroupByQuery subquery = GroupByQuery
   .builder()
   .setDataSource(QueryRunnerTestHelper.dataSource)
   .setQuerySegmentSpec(QueryRunnerTestHelper.fullOnIntervalSpec)
   .setDimensions(new DefaultDimensionSpec("market", "market"), new DefaultDimensionSpec("quality", "quality"))
   .setAggregatorSpecs(QueryRunnerTestHelper.rowsCount, new LongSumAggregatorFactory("index", "index"))
   .setGranularity(QueryRunnerTestHelper.dayGran)
   .build();
 final GroupByQuery query = GroupByQuery
   .builder()
   .setDataSource(subquery)
   .setQuerySegmentSpec(QueryRunnerTestHelper.fullOnIntervalSpec)
   .setDimensions(Collections.emptyList())
   .setAggregatorSpecs(new CardinalityAggregatorFactory(
     "car",
     ImmutableList.of(new DefaultDimensionSpec("quality", "quality")),
     false
   ))
   .setGranularity(QueryRunnerTestHelper.allGran)
   .build();
 List<Row> expectedResults = Collections.singletonList(
   GroupByQueryRunnerTestHelper.createExpectedRow("1970-01-01", "car", QueryRunnerTestHelper.UNIQUES_9)
 );
 Iterable<Row> results = GroupByQueryRunnerTestHelper.runQuery(factory, runner, query);
 TestHelper.assertExpectedObjects(expectedResults, results, "subquery-cardinality");
}

.setAggregatorSpecs(
  AGGS(
    new CardinalityAggregatorFactory(
      "a0:a",
      null,

.aggregators(
  AGGS(
    new CardinalityAggregatorFactory(
      "a0",
      null,

.aggregators(
  AGGS(
    new CardinalityAggregatorFactory(
      "a0",
      null,

AGGS(
  new LongSumAggregatorFactory("a0", "cnt"),
  new CardinalityAggregatorFactory(
    "a1",
    null,

.setQuerySegmentSpec(QueryRunnerTestHelper.firstToThird)
.setDimensions(new DefaultDimensionSpec("market", "alias"))
.setAggregatorSpecs(QueryRunnerTestHelper.rowsCount, new CardinalityAggregatorFactory(
  "numVals",
  ImmutableList.of(new ExtractionDimensionSpec(

.setAggregatorSpecs(AGGS(
  new CountAggregatorFactory("a0"),
  new CardinalityAggregatorFactory(
    "a1",
    null,