presto-redis/src/main/java/io/prestosql/plugin/redis/RedisRecordCursor.java/RedisRecordCursor/getType
class RedisRecordCursor:    @Override
    public Type getType(int field)
    {
        checkArgument(field < columnHandles.size(), "Invalid field index");
        return columnHandles.get(field).getType();
    }