What does addScalar do?

Question

The JavaDoc says:

SQLQuery org.hibernate.SQLQuery.addScalar(String columnAlias, Type type)

Declare a scalar query result

I know what

Answer 1

addScalar is an information of returnType for a given key in SQL query.

Example:

Query a = new SqlQuery("Select username as un from users where ...");
a.addScalar("un", String);

If you query for result, the result will be String or other types if you specify.