How to use

getElementType

method

in

net.hydromatic.optiq.impl.java.ReflectiveSchema

/** Returns a table based on a particular field of this schema. If the
 * field is not of the right type to be a relation, returns null. */
private <T> Table fieldRelation(final Field field) {
 final Type elementType = getElementType(field.getType());
 if (elementType == null) {
  return null;
 }
 Object o;
 try {
  o = field.get(target);
 } catch (IllegalAccessException e) {
  throw new RuntimeException(
    "Error while accessing field " + field, e);
 }
 @SuppressWarnings("unchecked")
 final Enumerable<T> enumerable = toEnumerable(o);
 return new FieldTable<T>(field, elementType, enumerable);
}

public <T> TableFunction<T> methodMember(final Method method) {
 final ReflectiveSchema schema = this;
 final Type elementType = getElementType(method.getReturnType());
 final RelDataType relDataType = typeFactory.createType(elementType);
 final Class<?>[] parameterTypes = method.getParameterTypes();

final Type elementType = getElementType(field.getType());
if (elementType == null) {
 return null;