Correspondence table about primitive data type between C Client and Ruby Client
GridDB data type	C client	Ruby client
STRING	GSChar*	string
BOOL	GSBool	boolean
BYTE	int8_t	integer
SHORT	int16_t	integer
INTEGER	int32_t	integer
LONG	int64_t	integer
FLOAT	float	float
DOUBLE	double	float
TIMESTAMP	GSTimestamp	GSTimestamp
BLOB	GSBlob	string
	size_t	integer