ClickHouse/dbms/Functions/bitBoolMaskOr.cpp

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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
#include <DataTypes/NumberTraits.h>
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namespace DB
{
namespace ErrorCodes
{
extern const int BAD_CAST;
}
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/// Working with UInt8: last bit = can be true, previous = can be false (Like dbms/Storages/MergeTree/BoolMask.h).
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/// 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"
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template <typename A, typename B>
struct BitBoolMaskOrImpl
{
using ResultType = UInt8;
static const constexpr bool allow_fixed_string = false;
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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>)
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throw DB::Exception("It's a bug! Only UInt8 type is supported by __bitBoolMaskOr.", ErrorCodes::BAD_CAST);
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return static_cast<ResultType>(
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((static_cast<ResultType>(left) | static_cast<ResultType>(right)) & 1)
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| ((((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>();
}
}