ClickHouse/src/Functions/bitBoolMaskAnd.cpp

48 lines
1.7 KiB
C++
Raw Normal View History

2019-08-02 19:21:55 +00:00
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
#include <DataTypes/NumberTraits.h>
2019-12-29 01:13:17 +00:00
2019-08-02 19:21:55 +00:00
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_CAST;
}
2019-08-02 19:21:55 +00:00
2020-04-03 15:14:31 +00:00
/// Working with UInt8: last bit = can be true, previous = can be false (Like src/Storages/MergeTree/BoolMask.h).
2019-08-04 13:03:38 +00:00
/// This function provides "AND" operation for BoolMasks.
/// Returns: "can be true" = A."can be true" AND B."can be true"
/// "can be false" = A."can be false" OR B."can be false"
2019-08-02 19:21:55 +00:00
template <typename A, typename B>
struct BitBoolMaskAndImpl
{
using ResultType = UInt8;
static const constexpr bool allow_fixed_string = false;
2019-08-02 19:21:55 +00:00
template <typename Result = ResultType>
static inline Result apply(A left, B right)
{
if constexpr (!std::is_same_v<A, ResultType> || !std::is_same_v<B, ResultType>)
2019-08-15 18:48:48 +00:00
throw DB::Exception("It's a bug! Only UInt8 type is supported by __bitBoolMaskAnd.", ErrorCodes::BAD_CAST);
2019-08-02 19:21:55 +00:00
return static_cast<ResultType>(
((static_cast<ResultType>(left) & static_cast<ResultType>(right)) & 1)
| ((((static_cast<ResultType>(left) >> 1) | (static_cast<ResultType>(right) >> 1)) & 1) << 1));
}
#if USE_EMBEDDED_COMPILER
static constexpr bool compilable = false;
#endif
};
struct NameBitBoolMaskAnd { static constexpr auto name = "__bitBoolMaskAnd"; };
using FunctionBitBoolMaskAnd = FunctionBinaryArithmetic<BitBoolMaskAndImpl, NameBitBoolMaskAnd>;
void registerFunctionBitBoolMaskAnd(FunctionFactory & factory)
{
factory.registerFunction<FunctionBitBoolMaskAnd>();
}
}