public void setExpected(UpdateCondition expected) {
        this.expected = expected;
    }
The update condition which, if specified, determines whether the specified attributes will be deleted or not. The
update condition must be satisfied in order for this request to be processed and the attributes to be deleted.

@param expected
       The update condition which, if specified, determines whether the specified attributes will be deleted or
       not. The update condition must be satisfied in order for this request to be processed and the attributes
       to be deleted.
aws-java-sdk-simpledb/src/main/java/com/amazonaws/services/simpledb/model/DeleteAttributesRequest.java