public static Boolean notBoolOperand(Boolean input) {
    if (input == null) {
      return null;
    }
    return input ? Boolean.FALSE : Boolean.TRUE;
  }
Not a Boolean operand in the context of pruning match

Operand | Not
T | F
F | T
unknown | unknown
@param input
         match result
@return
ql/src/java/org/apache/hadoop/hive/ql/optimizer/listbucketingpruner/ListBucketingPrunerUtils.java