How to use

FloatMaxAggregatorFactory

in

org.apache.druid.query.aggregation

@Override
public AggregatorFactory getCombiningFactory()
{
 return new FloatMaxAggregatorFactory(name, name, null, macroTable);
}

@Override
protected BaseFloatColumnValueSelector selector(ColumnSelectorFactory metricFactory)
{
 return getFloatColumnSelector(
   metricFactory,
   Float.NEGATIVE_INFINITY
 );
}

@Override
public List<AggregatorFactory> getRequiredColumns()
{
 return Collections.singletonList(new FloatMaxAggregatorFactory(fieldName, fieldName, expression, macroTable));
}

@Override
protected BaseFloatColumnValueSelector selector(ColumnSelectorFactory metricFactory)
{
 return getFloatColumnSelector(
   metricFactory,
   Float.NEGATIVE_INFINITY
 );
}

 private static AggregatorFactory createMaxAggregatorFactory(
   final ValueType aggregationType,
   final String name,
   final String fieldName,
   final String expression,
   final ExprMacroTable macroTable
 )
 {
  switch (aggregationType) {
   case LONG:
    return new LongMaxAggregatorFactory(name, fieldName, expression, macroTable);
   case FLOAT:
    return new FloatMaxAggregatorFactory(name, fieldName, expression, macroTable);
   case DOUBLE:
    return new DoubleMaxAggregatorFactory(name, fieldName, expression, macroTable);
   default:
    throw new ISE("Cannot create aggregator factory for type[%s]", aggregationType);
  }
 }
}

QueryRunnerTestHelper.commonFloatAggregators,
Lists.newArrayList(
  new FloatMaxAggregatorFactory("maxIndex", "indexFloat"),
  new FloatMinAggregatorFactory("minIndex", "indexFloat")

.setAggregatorSpecs(
  new FloatMinAggregatorFactory("a0", "m1"),
  new FloatMaxAggregatorFactory("a1", "m1")

.setAggregatorSpecs(
  new FloatMinAggregatorFactory("a0", "m1"),
  new FloatMaxAggregatorFactory("a1", "m1")

.aggregators(AGGS(
  new FloatMinAggregatorFactory("a0", "m1"),
  new FloatMaxAggregatorFactory("a1", "m1")
))
.postAggregators(

@Override
public AggregatorFactory getCombiningFactory()
{
 return new FloatMaxAggregatorFactory(name, name, null, macroTable);
}

@Override
public List<AggregatorFactory> getRequiredColumns()
{
 return Collections.singletonList(new FloatMaxAggregatorFactory(fieldName, fieldName, expression, macroTable));
}

 private static AggregatorFactory createMaxAggregatorFactory(
   final ValueType aggregationType,
   final String name,
   final String fieldName,
   final String expression,
   final ExprMacroTable macroTable
 )
 {
  switch (aggregationType) {
   case LONG:
    return new LongMaxAggregatorFactory(name, fieldName, expression, macroTable);
   case FLOAT:
    return new FloatMaxAggregatorFactory(name, fieldName, expression, macroTable);
   case DOUBLE:
    return new DoubleMaxAggregatorFactory(name, fieldName, expression, macroTable);
   default:
    throw new ISE("Cannot create aggregator factory for type[%s]", aggregationType);
  }
 }
}