mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 05:22:17 +00:00
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
#include <Functions/FunctionFactory.h>
|
|
#include <Functions/FunctionBinaryArithmetic.h>
|
|
#include <Core/AccurateComparison.h>
|
|
#include <Functions/LeastGreatestGeneric.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
template <typename A, typename B>
|
|
struct GreatestBaseImpl
|
|
{
|
|
using ResultType = NumberTraits::ResultOfGreatest<A, B>;
|
|
static const constexpr bool allow_fixed_string = false;
|
|
static const constexpr bool allow_string_integer = false;
|
|
|
|
template <typename Result = ResultType>
|
|
static inline Result apply(A a, B b)
|
|
{
|
|
return static_cast<Result>(a) > static_cast<Result>(b) ?
|
|
static_cast<Result>(a) : static_cast<Result>(b);
|
|
}
|
|
|
|
#if USE_EMBEDDED_COMPILER
|
|
static constexpr bool compilable = true;
|
|
|
|
static inline llvm::Value * compile(llvm::IRBuilder<> & b, llvm::Value * left, llvm::Value * right, bool is_signed)
|
|
{
|
|
if (!left->getType()->isIntegerTy())
|
|
{
|
|
/// Follows the IEEE-754 semantics for maxNum except for the handling of signaling NaNs. This matches the behavior of libc fmax.
|
|
return b.CreateMaxNum(left, right);
|
|
}
|
|
|
|
auto * compare_value = is_signed ? b.CreateICmpSGT(left, right) : b.CreateICmpUGT(left, right);
|
|
return b.CreateSelect(compare_value, left, right);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
template <typename A, typename B>
|
|
struct GreatestSpecialImpl
|
|
{
|
|
using ResultType = make_unsigned_t<A>;
|
|
static const constexpr bool allow_fixed_string = false;
|
|
static const constexpr bool allow_string_integer = false;
|
|
|
|
template <typename Result = ResultType>
|
|
static inline Result apply(A a, B b)
|
|
{
|
|
static_assert(std::is_same_v<Result, ResultType>, "ResultType != Result");
|
|
return accurate::greaterOp(a, b) ? static_cast<Result>(a) : static_cast<Result>(b);
|
|
}
|
|
|
|
#if USE_EMBEDDED_COMPILER
|
|
static constexpr bool compilable = false; /// ???
|
|
#endif
|
|
};
|
|
|
|
template <typename A, typename B>
|
|
using GreatestImpl = std::conditional_t<!NumberTraits::LeastGreatestSpecialCase<A, B>, GreatestBaseImpl<A, B>, GreatestSpecialImpl<A, B>>;
|
|
|
|
struct NameGreatest { static constexpr auto name = "greatest"; };
|
|
using FunctionGreatest = FunctionBinaryArithmetic<GreatestImpl, NameGreatest>;
|
|
|
|
void registerFunctionGreatest(FunctionFactory & factory)
|
|
{
|
|
factory.registerFunction<LeastGreatestOverloadResolver<LeastGreatest::Greatest, FunctionGreatest>>(FunctionFactory::CaseInsensitive);
|
|
}
|
|
|
|
}
|