Couchbase Lite 2.0 DISTINCT Operator In QueryBuilder

Mobile Couchbase Lite
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1

Hi, I’m using Couchbase Lite 2.0 for Android, and I’m trying to construct a query using the QueryBuilder object. However, I can’t figure out how to perform a SELECT DISTINCT query, as in: http://www.sqlitetutorial.net/sqlite-select-distinct

Specifically, I’m trying to get the list of all “types” in my database, like so:

Query query = QueryBuilder.select(SelectResult.expression(Expression.property("type"))).from(DataSource.database(database));

query.addChangeListener(new QueryChangeListener()
    {
        @Override public void changed(QueryChange change)
        {
            ResultSet resultSet = change.getResults();

            for(Result result : resultSet)
            {
                String type = result.getString(0);

                Log.e(type);

                typeArrayList.add(type);
            }
        }
    });

but I want to avoid duplicates. Does Couchbase Lite’s QueryBuilder have the ability to filter out duplicates using a DISTINCT operator or something similar?

2

There is a selectDistinct that you can use…

 Query q = QueryBuilder.selectDistinct(SelectResult.property("type")).from(DataSource.database(db));
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