presto-mongodb/src/main/java/io/prestosql/plugin/mongodb/MongoSplitManager.java/MongoSplitManager/getSplits
class MongoSplitManager:    @Override
    public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableHandle table, SplitSchedulingStrategy splitSchedulingStrategy)
    {
        MongoSplit split = new MongoSplit(addresses);

        return new FixedSplitSource(ImmutableList.of(split));
    }