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: mod.rs
    path of file: ./repos/connector-x/connectorx/src/destinations/arrow2
    
    the code of the file until where you have to start completion: //! Destination implementation for Arrow2.

mod arrow_assoc;
mod errors;
mod funcs;
pub mod typesystem;

use super::{Consume, Destination, DestinationPartition};
use crate::constants::RECORD_BATCH_SIZE;
use crate::data_order::DataOrder;
use crate::typesystem::{Realize, TypeAssoc, TypeSystem};
use anyhow::anyhow;
use arrow2::array::{Array, MutableArray};
use arrow2::chunk::Chunk;
use arrow2::datatypes::{Field, Schema};
use arrow_assoc::ArrowAssoc;
pub use errors::{Arrow2DestinationError, Result};
use fehler::throw;
use fehler::throws;
use funcs::{FFinishBuilder, FNewBuilder, FNewField};
use polars::prelude::{DataFrame, PolarsError, Series};
use std::convert::TryFrom;
use std::sync::{Arc, Mutex};
pub use t
    
    fn consume(&mut self, value: T) {
        let col = self.current_col;
        self.current_col = (self.current_col + 1) % self.ncols();
        self.schema[col].check::<T>()?;

        match &mut self.builders {
            Some(builders) => {
                <T as ArrowAssoc>::push(
                    builders[col]
                        .as_mut_any()
                        .downcast_mut::<T::Builder>()
                        .ok_or_else(|| anyhow!("cannot cast arrow builder for append"))?,
                    value,
                );
            }
            None => throw!(anyhow!("arrow arrays are empty!")),
        }

        // flush if exceed batch_size
        if self.current_col == 0 {
            self.current_row += 1;
            if self.current_row >= RECORD_BATCH_SIZE {
                self.flush()?;
                self.allocate()?;
            }
        }
    }