If the result set rewrite process encounters a column with an unsupported data type, the TDS protocol cannot create the result set. Consequently Dynamic Data Masking cannot mask any result set that contains a column with an unsupported data type, nor any other result sets subsequent to that result set in the response.

The following table shows the conversion that takes place between TDS types, Microsoft SQL Server data types, and Java types:

TDS Type	Microsoft SQL Server Type	Supported?
Fixed-Length Data Types
NULLTYPE = %x1F	Null	No
INT1TYPE = %x30	TinyInt	Yes
BITTYPE = %x32	Bit	Yes
INT2TYPE = %x34	SmallInt	Yes
INT4TYPE = %x38	Int	Yes
DATETIM4TYPE = %x3A	SmallDateTime	Yes
FLT4TYPE = %x3B	Real	Yes
MONEYTYPE = %x3C	Money	Yes
DATETIMETYPE = %x3D	DateTime	Yes
FLT8TYPE = %x3E	Float	Yes
MONEY4TYPE = %x7A	SmallMoney	Yes
INT8TYPE = %x7F	BigInt	Yes
		Yes
Variable-Length Data Types
GUIDTYPE = %x24	UniqueIdentifier	No
INTNTYPE = %x26	(see below)	Yes
DECIMALTYPE = %x37	Decimal (legacy support)	Yes
NUMERICTYPE = %x3F	Numeric (legacy support)	Yes
BITNTYPE = %x68	Bit	Yes
DECIMALNTYPE = %x6A	Decimal	Yes
NUMERICNTYPE = %x6C	Numeric	Yes
FLTNTYPE = %x6D	Float	Yes
MONEYNTYPE = %x6E	SmallMoney/Money	Yes
DATETIMNTYPE = %x6F	(see below)	Yes
DATENTYPE = %x28	(introduced in TDS 7.3)	Yes
TIMENTYPE = %x29	(introduced in TDS 7.3)	Yes
DATETIME2NTYPE = %x2A	(introduced in TDS 7.3)	Yes
DATETIMEOFFSETNTYPE = %x2B	(introduced in TDS 7.3)	No
CHARTYPE = %x2F	Char (legacy support)	Yes
VARCHARTYPE = %x27	VarChar (legacy support)	Yes
BINARYTYPE = %x2D	byte[]	Yes
VARBINARYTYPE = %x25	VarBinary (legacy support)	Yes
BIGVARBINTYPE = %xA5	VarBinary	Yes
BIGVARCHRTYPE = %xA7	VarChar	Yes
BIGBINARYTYPE = %xAD	Binary	Yes
BIGCHARTYPE = %xAF	Char	Yes
NVARCHARTYPE = %xE7	NVarChar	Yes
NCHARTYPE = %xEF	NChar	Yes
XMLTYPE = %xF1	XML (introduced in TDS 7.2)	Yes
UDTTYPE = %xF0	CLR UDT (introduced in TDS 7.2)	No
TEXTTYPE = %x23	Text	Yes
IMAGETYPE = %x22	Image	No
NTEXTTYPE = %x63	NText	Yes
SSVARIANTTYPE = %x62	Sql_Variant (introduced in TDS 7.2)	No