Efficient way to get unique values from a column about geopackage-java HOT 4 CLOSED

FeatureDao dao = geoPackage.getFeatureDao("table_name");
String column = "column_name";
FeatureResultSet results = dao.getUserDb().rawQuery(
	"SELECT DISTINCT " + column + " FROM " + dao.getTableName(), null);
while(results.moveToNext()) {
	Object value = results.getValue(0);
	//results.getString(0);
	//results.getInt(0);
	//results.getBlob(0);
	//results.getLong(0);
	//results.getShort(0);
	//results.getDouble(0);
	//results.getFloat(0);
	System.out.println(value);
}
results.close();

FeatureDao dao = geoPackage.getFeatureDao("table_name");
String column = "column_name";
FeatureResultSet results = dao.query(true, new String[] { column });
while (results.moveToNext()) {
	Object value = results.getValue(column);
	System.out.println(value);
}
results.close();