Method IsValid

publication/source_code/include/duckdb/constants.hpp:127–127

	inline bool operator!=(const PhysicalIndex& rhs) const { return index != rhs.index; };
	inline bool operator<(const PhysicalIndex& rhs) const { return index < rhs.index; };
	bool        IsValid() { return index != DConstants::INVALID_INDEX; }
};

DUCKDB_API uint64_t NextPowerOfTwo(uint64_t v);