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/delta-rs/crates/core/src/kernel/snapshot
    
    the code of the file until where you have to start completion: //! Delta table snapshots
//!
//! A snapshot represents the state of a Delta Table at a given version.
//!
//! There are two types of snapshots:
//!
//! - [`Snapshot`] is a snapshot where most data is loaded on demand and only the
//!   bare minimum - [`Protocol`] and [`Metadata`] - is cached in memory.
//! - [`EagerSnapshot`] is a snapshot where much more log data is eagerly loaded into memory.
//!
//! The sub modules provide structures and methods that aid in generating
//! and consuming snapshots.
//!
//! ## Reading the log
//!
//!

use std::io::{BufRead, BufReader, Cursor};
use std::sync::Arc;

use ::serde::{Deserialize, Serialize};
use arrow_array::RecordBatch;
use futures::stream::BoxStream;
use futures::{StreamExt, TryStreamExt
    
    async fn test_snapshot(context: &IntegrationContext) -> TestResult {
        let store = context
            .table_builder(TestTables::Simple)
            .build_storage()?
            .object_store();

        let snapshot =
            Snapshot::try_new(&Path::default(), store.clone(), Default::default(), None).await?;

        let bytes = serde_json::to_vec(&snapshot).unwrap();
        let actual: Snapshot = serde_json::from_slice(&bytes).unwrap();
        assert_eq!(actual, snapshot);

        let schema_string = r#"{"type":"struct","fields":[{"name":"id","type":"long","nullable":true,"metadata":{}}]}"#;
        let expected: StructType = serde_json::from_str(schema_string)?;
        assert_eq!(snapshot.schema(), &expected);

        let infos = snapshot
            .commit_infos(store.clone(), None)
            .await?
            .try_collect::<Vec<_>>()
            .await?;
        let infos = infos.into_iter().flatten().collect_vec();
        assert_eq!(infos.len(), 5);

        let tombstones = snapshot
            .tombstones(store.clone())?
            .try_collect::<Vec<_>>()
            .await?;
        let tombstones = tombstones.into_iter().flatten().collect_vec();
        assert_eq!(tombstones.len(), 31);

        let batches = snapshot
            .files(store.clone())?
            .try_collect::<Vec<_>>()
            .await?;
        let expected = [
            "+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+",
            "| add                                                                                                                                                                                                                                                                                                                                  |",
            "+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+",
            "| {path: part-00000-2befed33-c358-4768-a43c-3eda0d2a499d-c000.snappy.parquet, partitionValues: {}, size: 262, modificationTime: 1587968626000, dataChange: true, stats: , tags: , deletionVector: , baseRowId: , defaultRowCommitVersion: , clusteringProvider: , stats_parsed: {numRecords: , minValues: , maxValues: , nullCount: }} |",
            "| {path: part-00000-c1777d7d-89d9-4790-b38a-6ee7e24456b1-c000.snappy.parquet, partitionValues: {}, size: 262, modificationTime: 1587968602000, dataChange: true, stats: , tags: , deletionVector: , baseRowId: , defaultRowCommitVersion: , clusteringProvider: , stats_parsed: {numRecords: , minValues: , maxValues: , nullCount: }} |",
            "| {path: part-00001-7891c33d-cedc-47c3-88a6-abcfb049d3b4-c000.snappy.parquet, partitionValues: {}, size: 429, modificationTime: 1587968602000, dataChange: true, stats: , tags: , deletionVector: , baseRowId: , defaultRowCommitVersion: , clusteringProvider: , stats_parsed: {numRecords: , minValues: , maxValues: , nullCount: }} |",
            "| {path: part-00004-315835fe-fb44-4562-98f6-5e6cfa3ae45d-c000.snappy.parquet, partitionValues: {}, size: 429, modificationTime: 1587968602000, dataChange: true, stats: , tags: , deletionVector: , baseRowId: , defaultRowCommitVersion: , clusteringProvider: , stats_parsed: {numRecords: , minValues: , maxValues: , nullCount: }} |",
            "| {path: part-00007-3a0e4727-de0d-41b6-81ef-5223cf40f025-c000.snappy.parquet, partitionValues: {}, size: 429, modificationTime: 1587968602000, dataChange: true, stats: , tags: , deletionVector: , baseRowId: , defaultRowCommitVersion: , clusteringProvider: , stats_parsed: {numRecords: , minValues: , maxValues: , nullCount: }} |",
            "+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+",
        ];
        assert_batches_sorted_eq!(expected, &batches);

        let store = context
            .table_builder(TestTables::Checkpoints)
            .build_storage()?
            .object_store();

        for version in 0..=12 {
            let snapshot = Snapshot::try_new(
                &Path::default(),
                store.clone(),
                Default::default(),
                Some(version),
            )
            .await?;
            let batches = snapshot
                .files(store.clone())?
                .try_collect::<Vec<_>>()
                .await?;
            let num_files = batches.iter().map(|b| b.num_rows() as i64).sum::<i64>();
            assert_eq!(num_files, version);
        }

        Ok(())
    }