public ResultAndMessage isFilterSupported() {
	// To enable filter push-into optimization this function should return true
    // return new ResultAndMessage(true, "");
	return new ResultAndMessage(false, "Filter push-into optimization is not supported");
}

public ResultAndMessage pushFilter(InfaExpression condition) {
	
	// Add code to absorb the filter
	// If filter is successfully absorbed return new ResultAndMessage(true, ""); and the optimizer
	// will remove the filter from the mapping
	// If the filter is not absorbed, return new ResultAndMessage(false, msg); 
	return new ResultAndMessage(false, "Filter push-into optimization is not supported");
}