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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionsConversion.h>
#include <Functions/CastOverloadResolver.h>
#include <DataTypes/DataTypeFactory.h>
#include <DataTypes/DataTypeString.h>
namespace DB
{
namespace
{
class FunctionToBool : public IFunction
{
public:
static constexpr auto name = "toBool";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionToBool>();
}
std::string getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForNulls() const override { return false; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
auto bool_type = DataTypeFactory::instance().get("Bool");
return arguments[0]->isNullable() ? makeNullable(bool_type) : bool_type;
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t) const override
{
ColumnsWithTypeAndName cast_args
{
arguments[0],
{
DataTypeString().createColumnConst(arguments[0].column->size(), arguments[0].type->isNullable() ? "Nullable(Bool)" : "Bool"),
std::make_shared<DataTypeString>(),
""
}
};
FunctionOverloadResolverPtr func_builder_cast = CastInternalOverloadResolver<CastType::nonAccurate>::createImpl();
auto func_cast = func_builder_cast->build(cast_args);
return func_cast->execute(cast_args, result_type, arguments[0].column->size());
}
};
}
REGISTER_FUNCTION(ToBool)
{
factory.registerFunction<FunctionToBool>();
}
}
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