gluesql-core 0.20.0

GlueSQL - Open source SQL database engine fully written in Rust with pure functional execution layer, easily swappable storage and web assembly support!
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

use {
    super::{DistinctPlan, ProjectPlan, SelectOrderByPlan, ValuesOrderByPlan, ValuesPlan},
    crate::plan::ExprPlan,
    serde::{Deserialize, Serialize},
};

#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct OffsetPlan {
    pub input: OffsetInputPlan,
    pub count: ExprPlan,
}

impl OffsetPlan {
    pub(super) fn project(&self) -> Option<&ProjectPlan> {
        match &self.input {
            OffsetInputPlan::Project(project) => Some(project),
            OffsetInputPlan::Values(_) | OffsetInputPlan::ValuesOrderBy(_) => None,
            OffsetInputPlan::SelectOrderBy(order_by) => Some(&order_by.input),
            OffsetInputPlan::Distinct(distinct) => Some(distinct.project()),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum OffsetInputPlan {
    Project(ProjectPlan),
    Values(ValuesPlan),
    SelectOrderBy(SelectOrderByPlan),
    ValuesOrderBy(ValuesOrderByPlan),
    Distinct(DistinctPlan),
}

#[cfg(test)]
mod tests {
    use {
        super::{OffsetInputPlan, OffsetPlan},
        crate::{
            ast::Literal,
            plan::{ExprPlan, ValuesPlan},
        },
    };

    fn count(value: i64) -> ExprPlan {
        ExprPlan::Literal(Literal::Number(value.into()))
    }

    #[test]
    fn offset_accepts_values_input() {
        let plan = OffsetPlan {
            input: OffsetInputPlan::Values(ValuesPlan(Vec::new())),
            count: count(2),
        };

        assert!(matches!(
            plan,
            OffsetPlan {
                input: OffsetInputPlan::Values(_),
                count: actual,
            } if actual == count(2)
        ));
    }
}