Current 3.0 implementation of ResultsetMetadata.getColumnTypeName return server data type.
TEXT datatypes are returned as BLOB datatype with charset not binary, driver returning erronous BLOB datatype.
Server provide new extended information like JSON format, UUID those are not returned.
additionally numeric unsigned value have not unsigned information (i.e. "SHORT" returned in place of "SHORT UNSIGNED")
Geometry datatype precision is lost : POINT is returned as GEOMETRY.