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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
#include <DataTypes/NumberTraits.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
namespace
{
/// Working with UInt8: last bit = can be true, previous = can be false (Like src/Storages/MergeTree/BoolMask.h).
/// 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"
template <typename A, typename B>
struct BitBoolMaskAndImpl
{
using ResultType = UInt8;
static const constexpr bool allow_fixed_string = false;
static const constexpr bool allow_string_integer = false;
template <typename Result = ResultType>
static inline Result apply([[maybe_unused]] A left, [[maybe_unused]] B right)
{
// Should be a logical error, but this function is callable from SQL.
// Need to investigate this.
if constexpr (!std::is_same_v<A, ResultType> || !std::is_same_v<B, ResultType>)
throw DB::Exception(ErrorCodes::BAD_ARGUMENTS, "It's a bug! Only UInt8 type is supported by __bitBoolMaskAnd.");
auto left_bits = littleBits<A>(left);
auto right_bits = littleBits<B>(right);
return static_cast<ResultType>((left_bits & right_bits & 1) | ((((left_bits >> 1) | (right_bits >> 1)) & 1) << 1));
}
#if USE_EMBEDDED_COMPILER
static constexpr bool compilable = false;
#endif
};
struct NameBitBoolMaskAnd { static constexpr auto name = "__bitBoolMaskAnd"; };
using FunctionBitBoolMaskAnd = BinaryArithmeticOverloadResolver<BitBoolMaskAndImpl, NameBitBoolMaskAnd>;
}
REGISTER_FUNCTION(BitBoolMaskAnd)
{
factory.registerFunction<FunctionBitBoolMaskAnd>();
}
}
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