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#include <AggregateFunctions/AggregateFunctionOrFill.h>
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
namespace DB
{
namespace
{
enum class Kind
{
OrNull,
OrDefault
};
class AggregateFunctionCombinatorOrFill final : public IAggregateFunctionCombinator
{
private:
Kind kind;
public:
explicit AggregateFunctionCombinatorOrFill(Kind kind_) : kind(kind_) {}
/// Due to aggregate_functions_null_for_empty
bool supportsNesting() const override { return true; }
String getName() const override
{
return kind == Kind::OrNull ? "OrNull" : "OrDefault";
}
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function,
const AggregateFunctionProperties &,
const DataTypes & arguments,
const Array & params) const override
{
if (kind == Kind::OrNull)
return std::make_shared<AggregateFunctionOrFill<true>>(nested_function, arguments, params);
else
return std::make_shared<AggregateFunctionOrFill<false>>(nested_function, arguments, params);
}
};
}
void registerAggregateFunctionCombinatorOrFill(AggregateFunctionCombinatorFactory & factory)
{
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorOrFill>(Kind::OrNull));
factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorOrFill>(Kind::OrDefault));
}
}
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