ClickHouse/dbms/Functions/bitBoolMaskOr.cpp
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

48 lines
1.7 KiB
C++

#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
#include <DataTypes/NumberTraits.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_CAST;
}
/// Working with UInt8: last bit = can be true, previous = can be false (Like dbms/Storages/MergeTree/BoolMask.h).
/// This function provides "OR" operation for BoolMasks.
/// Returns: "can be true" = A."can be true" OR B."can be true"
/// "can be false" = A."can be false" AND B."can be false"
template <typename A, typename B>
struct BitBoolMaskOrImpl
{
using ResultType = UInt8;
static const constexpr bool allow_fixed_string = false;
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>)
throw DB::Exception("It's a bug! Only UInt8 type is supported by __bitBoolMaskOr.", ErrorCodes::BAD_CAST);
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 NameBitBoolMaskOr { static constexpr auto name = "__bitBoolMaskOr"; };
using FunctionBitBoolMaskOr = FunctionBinaryArithmetic<BitBoolMaskOrImpl, NameBitBoolMaskOr>;
void registerFunctionBitBoolMaskOr(FunctionFactory & factory)
{
factory.registerFunction<FunctionBitBoolMaskOr>();
}
}