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#include <AggregateFunctions/AggregateFunctionDistinct.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
#include <AggregateFunctions/Helpers.h>
#include <Common/typeid_cast.h>
namespace DB
{
struct Settings;
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
namespace
{
class AggregateFunctionCombinatorDistinct final : public IAggregateFunctionCombinator
{
public:
String getName() const override { return "Distinct"; }
DataTypes transformArguments(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Incorrect number of arguments for aggregate function with {} suffix", getName());
return arguments;
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
AggregateFunctionPtr res;
if (arguments.size() == 1)
{
res.reset(createWithNumericType<
AggregateFunctionDistinct,
AggregateFunctionDistinctSingleNumericData>(*arguments[0], nested_function, arguments, params));
if (res)
return res;
if (arguments[0]->isValueUnambiguouslyRepresentedInContiguousMemoryRegion())
return std::make_shared<
AggregateFunctionDistinct<
AggregateFunctionDistinctSingleGenericData<true>>>(nested_function, arguments, params);
else
return std::make_shared<
AggregateFunctionDistinct<
AggregateFunctionDistinctSingleGenericData<false>>>(nested_function, arguments, params);
}
return std::make_shared<AggregateFunctionDistinct<AggregateFunctionDistinctMultipleGenericData>>(nested_function, arguments, params);
}
};
}
void registerAggregateFunctionCombinatorDistinct(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorDistinct>());
}
}
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