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#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionFactory.h>
#include <DataTypes/DataTypesNumber.h>
#include <Core/ColumnNumbers.h>
namespace DB
{
namespace
{
/// ifNotFinite(x, y) is equivalent to isFinite(x) ? x : y.
class FunctionIfNotFinite : public IFunction
{
public:
static constexpr auto name = "ifNotFinite";
explicit FunctionIfNotFinite(ContextPtr context_) : context(context_) {}
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionIfNotFinite>(context);
}
std::string getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 2; }
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ColumnNumbers getArgumentsThatDontImplyNullableReturnType(size_t /*number_of_arguments*/) const override { return {0}; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
auto is_finite_type = FunctionFactory::instance().get("isFinite", context)->build({arguments[0]})->getResultType();
auto if_type = FunctionFactory::instance().get("if", context)->build({{nullptr, is_finite_type, ""}, arguments[0], arguments[1]})->getResultType();
return if_type;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
ColumnsWithTypeAndName is_finite_columns{arguments[0]};
auto is_finite = FunctionFactory::instance().get("isFinite", context)->build(is_finite_columns);
auto res = is_finite->execute(is_finite_columns, is_finite->getResultType(), input_rows_count);
ColumnsWithTypeAndName if_columns
{
{res, is_finite->getResultType(), ""},
arguments[0],
arguments[1],
};
auto func_if = FunctionFactory::instance().get("if", context)->build(if_columns);
return func_if->execute(if_columns, result_type, input_rows_count);
}
private:
ContextPtr context;
};
}
REGISTER_FUNCTION(IfNotFinite)
{
factory.registerFunction<FunctionIfNotFinite>();
}
}
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