presto-mongodb/src/main/java/io/prestosql/plugin/mongodb/MongoSession.java/MongoSession/buildColumnHandle
class MongoSession:    private MongoColumnHandle buildColumnHandle(Document columnMeta)
    {
        String name = columnMeta.getString(FIELDS_NAME_KEY);
        String typeString = columnMeta.getString(FIELDS_TYPE_KEY);
        boolean hidden = columnMeta.getBoolean(FIELDS_HIDDEN_KEY, false);

        Type type = typeManager.fromSqlType(typeString);

        return new MongoColumnHandle(name, type, hidden);
    }