ClickHouse

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#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/AggregateFunctionStatisticsSimple.h>
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namespace DB
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{
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template <typename T1, typename T2> using AggregateFunctionCovar = AggregateFunctionVarianceSimple<StatFuncTwoArg<T1, T2, CovarMoments>>;
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void registerAggregateFunctionsStatisticsCovar(AggregateFunctionFactory & factory)
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{
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    factory.registerFunction("covarSamp", createAggregateFunctionStatisticsBinary<AggregateFunctionCovar, StatisticsFunctionKind::covarSamp>);
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    factory.registerFunction("covarPop", createAggregateFunctionStatisticsBinary<AggregateFunctionCovar, StatisticsFunctionKind::covarPop>);
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    /// Synonyms for compatibility.
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    factory.registerAlias("COVAR_SAMP", "covarSamp", AggregateFunctionFactory::CaseInsensitive);
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    factory.registerAlias("COVAR_POP", "covarPop", AggregateFunctionFactory::CaseInsensitive);
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}
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}
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