deltalake-core 0.32.0

Native Delta Lake implementation in Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148

#[cfg(feature = "datafusion")]
#[cfg(test)]
mod tests {
    use crate::{
        DeltaTable, DeltaTableBuilder, checkpoints, ensure_table_uri,
        kernel::{Transaction, transaction::CommitProperties},
        protocol::SaveMode,
        writer::test_utils::get_record_batch,
    };

    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
    async fn test_app_txn_workload() {
        // Test that the transaction ids can be read from different scenarios
        // 1. Write new table to storage
        // 2. Read new table
        // 3. Write to table a new txn id and then update a different table state that uses the same underlying table
        // 4. Write a checkpoint and read that checkpoint.

        let tmp_dir = tempfile::tempdir().unwrap();
        let tmp_path = std::fs::canonicalize(tmp_dir.path()).unwrap();

        let batch = get_record_batch(None, false);
        let table = DeltaTable::try_from_url(ensure_table_uri(tmp_path.to_str().unwrap()).unwrap())
            .await
            .unwrap()
            .write(vec![batch.clone()])
            .with_save_mode(SaveMode::ErrorIfExists)
            .with_partition_columns(["modified"])
            .with_commit_properties(
                CommitProperties::default()
                    .with_application_transaction(Transaction::new("my-app", 1)),
            )
            .await
            .unwrap();
        let state = table.snapshot().unwrap();
        assert_eq!(state.version(), 0);
        assert_eq!(state.log_data().num_files(), 2);

        let app_txn = table
            .snapshot()
            .unwrap()
            .transaction_version(&table.log_store(), "my-app")
            .await
            .unwrap();
        assert_eq!(app_txn, Some(1));

        let log_store = table.log_store();
        let txn_version = table
            .snapshot()
            .unwrap()
            .transaction_version(log_store.as_ref(), "my-app")
            .await
            .unwrap();
        assert_eq!(txn_version, Some(1));

        // Test Txn Id can be read from existing table

        let mut table2 =
            DeltaTableBuilder::from_url(ensure_table_uri(tmp_path.to_str().unwrap()).unwrap())
                .unwrap()
                .load()
                .await
                .unwrap();
        let app_txn2 = table2
            .snapshot()
            .unwrap()
            .transaction_version(&table2.log_store(), "my-app")
            .await
            .unwrap();

        assert_eq!(app_txn2, Some(1));
        let txn_version = table2
            .snapshot()
            .unwrap()
            .transaction_version(log_store.as_ref(), "my-app")
            .await
            .unwrap();
        assert_eq!(txn_version, Some(1));

        // Write new data to the table and check that `update` functions work

        let table = table
            .write(vec![get_record_batch(None, false)])
            .with_commit_properties(
                CommitProperties::default()
                    .with_application_transaction(Transaction::new("my-app", 3)),
            )
            .await
            .unwrap();

        assert_eq!(table.version(), Some(1));
        let app_txn = table
            .snapshot()
            .unwrap()
            .transaction_version(&table.log_store(), "my-app")
            .await
            .unwrap();
        assert_eq!(app_txn, Some(3));
        let txn_version = table
            .snapshot()
            .unwrap()
            .transaction_version(log_store.as_ref(), "my-app")
            .await
            .unwrap();
        assert_eq!(txn_version, Some(3));

        table2.update_incremental(None).await.unwrap();
        assert_eq!(table2.version(), Some(1));
        let app_txn2 = table2
            .snapshot()
            .unwrap()
            .transaction_version(&table2.log_store(), "my-app")
            .await
            .unwrap();
        assert_eq!(app_txn2, Some(3));
        let txn_version = table2
            .snapshot()
            .unwrap()
            .transaction_version(log_store.as_ref(), "my-app")
            .await
            .unwrap();
        assert_eq!(txn_version, Some(3));

        // Create a checkpoint and then load
        checkpoints::create_checkpoint(&table, None).await.unwrap();
        let table3 =
            DeltaTableBuilder::from_url(ensure_table_uri(tmp_path.to_str().unwrap()).unwrap())
                .unwrap()
                .load()
                .await
                .unwrap();
        let app_txn3 = table3
            .snapshot()
            .unwrap()
            .transaction_version(&table3.log_store(), "my-app")
            .await
            .unwrap();
        assert_eq!(app_txn3, Some(3));
        assert_eq!(table3.version(), Some(1));
        let txn_version = table3
            .snapshot()
            .unwrap()
            .transaction_version(log_store.as_ref(), "my-app")
            .await
            .unwrap();
        assert_eq!(txn_version, Some(3));
    }
}