You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: column_iterator.rs
    path of file: ./repos/risinglight/src/storage/secondary/column
    
    the code of the file until where you have to start completion: // Copyright 2024 RisingLight Project Authors. Licensed under Apache-2.0.

use super::*;
use crate::array::{Array, ArrayImpl};
use crate::catalog::ColumnCatalog;
use crate::storage::secondary::column::{DateColumnIterator, IntervalC
    
    pub fn new_row_handler(rowset_id: u32, row_count: u32, start_pos: u32) -> StorageResult<Self> {
        let iter = Self::RowHandler(RowHandlerColumnIterator::new(
            rowset_id as usize,
            row_count as usize,
            start_pos as usize,
        ));
        Ok(iter)
    }