/* return the full column name uniquely identifying this field in a result set */
public String getFullColumnName(Field field) {
if (consistsOfSingleFromVariable()
&& (((FromVariable) expression.getWords().get(0))
.getObject()
.getTableName()
.equals(field.getTable().getName()))) {
return getUniqueName() + "." + field.getDescription();
} else {
System.err.println("Error : trying to get a field from a variable that does not know it");
return null;
}
}
