EDIT

ref #9772 , ref #9842 cleanup rowwrapper test

javadoc and minor

ref #9804 improve handling for empty categorical data (empty or null value state data) (cont.)

ref #9804 improve handling for empty categorical data (empty or null value state data)

cleanup

cleanup

ref #9816: all data need to be shown in displayString

cleanup

preliminary ignore test as it does not run in test suite

cleanup