How to use

InvertedTopNMetricSpec

in

org.apache.druid.query.topn

 topNMetricSpec = limitColumn.getDirection() == OrderByColumnSpec.Direction.ASCENDING
          ? baseMetricSpec
          : new InvertedTopNMetricSpec(baseMetricSpec);
} else if (plannerContext.getPlannerConfig().isUseApproximateTopN()) {
          ? new InvertedTopNMetricSpec(baseMetricSpec)
          : baseMetricSpec;
} else {

@Override
public <T> TopNMetricSpecBuilder<T> configureOptimizer(TopNMetricSpecBuilder<T> builder)
{
 if (!canBeOptimizedUnordered()) {
  return builder;
 }
 return delegate.configureOptimizer(builder);
}

.granularity(QueryRunnerTestHelper.allGran)
.dimension(QueryRunnerTestHelper.marketDimension)
.metric(new InvertedTopNMetricSpec(new NumericTopNMetricSpec(QueryRunnerTestHelper.indexMetric)))
.threshold(3)
.intervals(QueryRunnerTestHelper.firstToThird)

@Override
public <T> TopNMetricSpecBuilder<T> configureOptimizer(TopNMetricSpecBuilder<T> builder)
{
 if (!canBeOptimizedUnordered()) {
  return builder;
 }
 return delegate.configureOptimizer(builder);
}

.granularity(QueryRunnerTestHelper.allGran)
.dimension(QueryRunnerTestHelper.marketDimension)
.metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec("u", StringComparators.LEXICOGRAPHIC)))
.threshold(4)
.intervals(QueryRunnerTestHelper.firstToThird)

.granularity(QueryRunnerTestHelper.allGran)
.dimension(QueryRunnerTestHelper.marketDimension)
.metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec("upfront", StringComparators.LEXICOGRAPHIC)))
.threshold(4)
.intervals(QueryRunnerTestHelper.firstToThird)

.metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec(null, StringComparators.LEXICOGRAPHIC)))
.threshold(4)
.intervals(QueryRunnerTestHelper.firstToThird)

@Test
public void testSelectDistinctWithSortAsOuterQuery4() throws Exception
{
 testQuery(
   "SELECT * FROM (SELECT DISTINCT dim2 FROM druid.foo ORDER BY dim2 DESC LIMIT 5) LIMIT 10",
   ImmutableList.of(
     new TopNQueryBuilder()
       .dataSource(CalciteTests.DATASOURCE1)
       .intervals(QSS(Filtration.eternity()))
       .granularity(Granularities.ALL)
       .dimension(new DefaultDimensionSpec("dim2", "d0"))
       .metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec(null, StringComparators.LEXICOGRAPHIC)))
       .threshold(5)
       .context(QUERY_CONTEXT_DEFAULT)
       .build()
   ),
   NullHandling.replaceWithDefault() ?
   ImmutableList.of(
     new Object[]{""},
     new Object[]{"abc"},
     new Object[]{"a"}
   ) :
   ImmutableList.of(
     new Object[]{null},
     new Object[]{"abc"},
     new Object[]{"a"},
     new Object[]{""}
   )
 );
}

.metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec("u", StringComparators.LEXICOGRAPHIC)))
.threshold(4)
.intervals(QueryRunnerTestHelper.firstToThird)

.metric(new InvertedTopNMetricSpec(new DimensionTopNMetricSpec("p", StringComparators.LEXICOGRAPHIC)))
.threshold(4)
.intervals(QueryRunnerTestHelper.firstToThird)

.granularity(Granularities.ALL)
.dimension(new DefaultDimensionSpec("dim1", "d0"))
.metric(new InvertedTopNMetricSpec(new NumericTopNMetricSpec("p0")))
.aggregators(AGGS(
  new FloatMinAggregatorFactory("a0", "m1"),

 topNMetricSpec = limitColumn.getDirection() == OrderByColumnSpec.Direction.ASCENDING
          ? baseMetricSpec
          : new InvertedTopNMetricSpec(baseMetricSpec);
} else if (plannerContext.getPlannerConfig().isUseApproximateTopN()) {
          ? new InvertedTopNMetricSpec(baseMetricSpec)
          : baseMetricSpec;
} else {