//ColumnDescriptor(CD), the RC's TypeDescriptorImpl(TDI) should get
//all the attributes of CD's TDI. So, if the CD is for a user table's
//character type column, then this call by RC.init should have CD's
//collation attributes copied into RC along with other attributes.
this.typeId = source.typeId;
typeDescriptor = new TypeDescriptorImpl(source.typeDescriptor,
source.getPrecision(),
source.getScale(),
isNullable,
source.getMaximumWidth(),
source.getCollationType(),