return null;
}
CompareOp compareOp = null;
boolean isNullTest = false;
WritableByteArrayComparable comparator = new BinaryComparator(fieldValue);
byte[] startRow = HConstants.EMPTY_START_ROW;
byte[] stopRow = HConstants.EMPTY_END_ROW;
switch (functionName) {
case "equal":
compareOp = CompareOp.EQUAL;