How to use

NullSentinel

in

org.apache.calcite.rel.metadata

public List<Comparable> current() {
 for (int i = 0; i < columnCount; i++) {
  try {
   final Comparable value = (Comparable) r.getObject(i + 1);
   values[i] = NullSentinel.mask(value);
  } catch (SQLException e) {
   throw new RuntimeException(e);
  }
 }
 return ImmutableList.copyOf(values);
}

public List<Comparable> current() {
 for (int i = 0; i < columnCount; i++) {
  try {
   final Comparable value = (Comparable) r.getObject(i + 1);
   values[i] = NullSentinel.mask(value);
  } catch (SQLException e) {
   throw new RuntimeException(e);
  }
 }
 return ImmutableList.copyOf(values);
}

for (Object arg : args) {
 builder.add(NullSentinel.mask(arg));

for (Object arg : args) {
 builder.add(NullSentinel.mask(arg));

 } else {
  builder.add(NullSentinel.mask(arg));
Object result = method.invoke(metadata, args);
if (result != null) {
 entry = new CacheEntry(NullSentinel.mask(result), timestamp);
 cache.put(key, entry);