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#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/AggregateFunctionStatisticsSimple.h>
namespace DB
{
template <typename T> using AggregateFunctionSecondMoment = AggregateFunctionVarianceSimple<StatFuncOneArg<T, 2>>;
void registerAggregateFunctionsStatisticsSecondMoment(AggregateFunctionFactory & factory)
{
factory.registerFunction("varSamp", createAggregateFunctionStatisticsUnary<AggregateFunctionSecondMoment, StatisticsFunctionKind::varSamp>);
factory.registerFunction("varPop", createAggregateFunctionStatisticsUnary<AggregateFunctionSecondMoment, StatisticsFunctionKind::varPop>);
factory.registerFunction("stddevSamp", createAggregateFunctionStatisticsUnary<AggregateFunctionSecondMoment, StatisticsFunctionKind::stddevSamp>);
factory.registerFunction("stddevPop", createAggregateFunctionStatisticsUnary<AggregateFunctionSecondMoment, StatisticsFunctionKind::stddevPop>);
/// Synonyms for compatibility.
factory.registerAlias("VAR_SAMP", "varSamp", AggregateFunctionFactory::CaseInsensitive);
factory.registerAlias("VAR_POP", "varPop", AggregateFunctionFactory::CaseInsensitive);
factory.registerAlias("STDDEV_SAMP", "stddevSamp", AggregateFunctionFactory::CaseInsensitive);
factory.registerAlias("STDDEV_POP", "stddevPop", AggregateFunctionFactory::CaseInsensitive);
}
}
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