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#include <AggregateFunctions/AggregateFunctionFactory.h>
#include <AggregateFunctions/CrossTab.h>
#include <AggregateFunctions/FactoryHelpers.h>
#include <memory>
#include <cmath>
namespace DB
{
namespace
{
struct ContingencyData : CrossTabData
{
static const char * getName()
{
return "contingency";
}
Float64 getResult() const
{
if (count < 2)
return std::numeric_limits<Float64>::quiet_NaN();
Float64 phi = getPhiSquared();
return sqrt(phi / (phi + count));
}
};
}
void registerAggregateFunctionContingency(AggregateFunctionFactory & factory)
{
factory.registerFunction(ContingencyData::getName(),
[](const std::string & name, const DataTypes & argument_types, const Array & parameters, const Settings *)
{
assertBinary(name, argument_types);
assertNoParameters(name, parameters);
return std::make_shared<AggregateFunctionCrossTab<ContingencyData>>(argument_types);
});
}
}
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