@SuppressWarnings("unchecked")
    public Map<String, Object> getRawMap(String attrName) {
        return (Map<String, Object>)attributes.get(attrName);
    }
Convenient method to return the value of the specified attribute in the
current item as a map of string-to-<code>Object</code>'s; or null if the
attribute either doesn't exist or the attribute value is null. Note that
any numeric type of the map will be returned as <code>BigDecimal</code>.

@see #isNull(String) #isNull(String) to check if the attribute value is
     null.
@see #isPresent(String) #isPresent(String) to check if the attribute
     value is present.

@throws ClassCastException if the attribute is not a map
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/Item.java