presto-mongodb/src/main/java/io/prestosql/plugin/mongodb/MongoPageSink.java/MongoPageSink/MongoPageSink
class MongoPageSink:    public MongoPageSink(
            MongoClientConfig config,
            MongoSession mongoSession,
            ConnectorSession session,
            SchemaTableName schemaTableName,
            List<MongoColumnHandle> columns)
    {
        this.mongoSession = mongoSession;
        this.session = session;
        this.schemaTableName = schemaTableName;
        this.columns = columns;
        this.implicitPrefix = requireNonNull(config.getImplicitRowFieldPrefix(), "config.getImplicitRowFieldPrefix() is null");
    }