uqa-execution 0.4.0

Volcano physical operators with row-batch pipelines
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

//
// Unified Query Algebra
//
// Copyright (c) 2023-2026 Cognica, Inc.
//

use super::*;
use crate::row_locks::RowLockManager;
use std::cell::Cell;
use uqa_core::CancellationToken;

struct Session {
    manager: RowLockManager,
    cancellation: CancellationToken,
    definition: Cell<u32>,
}

impl Session {
    fn new() -> Self {
        Self {
            manager: RowLockManager::new(),
            cancellation: CancellationToken::new(),
            definition: Cell::new(1),
        }
    }
    fn resolve(&self) -> Result<Option<RelationBinding<u32>>, SQLError> {
        Ok(Some(RelationBinding {
            name: "public.v".into(),
            object_id: Some([1; 16]),
            value: self.definition.get(),
        }))
    }
    fn peer_acquires(&self, mode: RelationLockMode) -> bool {
        self.manager
            .try_acquire_relation(
                2,
                self.manager.table_key("public.v"),
                mode,
                0,
                &self.cancellation,
            )
            .unwrap()
    }
}

impl RelationLockSession for Session {
    fn acquire(
        &self,
        name: &str,
        mode: RelationLockMode,
        _: bool,
    ) -> Result<Option<ScopedRelationLock<'_>>, SQLError> {
        self.manager
            .acquire_scoped_relation(
                1,
                self.manager.table_key(name),
                mode,
                (0, 1),
                &self.cancellation,
            )
            .map(Some)
    }
    fn refresh_after_wait(&self) -> Result<(), SQLError> {
        self.definition.set(2);
        Ok(())
    }
}

#[test]
fn stable_identity_returns_the_new_definition_after_waiting() {
    let session = Session::new();
    let result = bind_relation(
        &session,
        RelationLockMode::AccessExclusive,
        false,
        || session.resolve(),
        |_| Ok(()),
    )
    .unwrap()
    .unwrap();
    assert_eq!(result.value, 2);
    assert!(!session.peer_acquires(RelationLockMode::AccessShare));
    session.manager.release_session(1);
    assert!(session.peer_acquires(RelationLockMode::AccessExclusive));
}

#[test]
fn changed_relation_kind_replaces_the_provisional_lock_mode() {
    let session = Session::new();
    let result = bind_relation_with_mode(
        &session,
        |binding: &RelationBinding<u32>| {
            if binding.value == 1 {
                RelationLockMode::ShareUpdateExclusive
            } else {
                RelationLockMode::AccessExclusive
            }
        },
        false,
        || session.resolve(),
        |_| Ok(()),
    )
    .unwrap()
    .unwrap();
    assert_eq!(result.value, 2);
    assert!(!session.peer_acquires(RelationLockMode::AccessShare));
    session.manager.release_session(1);
    assert!(session.peer_acquires(RelationLockMode::AccessExclusive));
}

#[test]
fn revoked_authority_discards_only_the_provisional_lock_upgrade() {
    let session = Session::new();
    session
        .acquire("public.v", RelationLockMode::AccessShare, false)
        .unwrap()
        .unwrap()
        .retain();
    session.definition.set(1);
    let result = bind_relation(
        &session,
        RelationLockMode::AccessExclusive,
        false,
        || session.resolve(),
        |binding| {
            if binding.value == 1 {
                Ok(())
            } else {
                Err(SQLError::Routine {
                    sqlstate: "42501".into(),
                    message: "ownership changed".into(),
                })
            }
        },
    );
    assert_eq!(result.err().unwrap().sqlstate(), Some("42501"));
    assert!(session.peer_acquires(RelationLockMode::RowExclusive));
    assert!(!session.peer_acquires(RelationLockMode::AccessExclusive));
}