sntl-schema 0.1.0

Shared schema analysis and cache library for Sentinel ORM macros and CLI
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

use sntl_schema::nullable::{ExprContext, infer_expr_nullability};
use sntl_schema::schema::{Column, PgTypeRef, Schema, Table};
use sntl_schema::scope::{JoinKind, Scope, TableRef};

fn simple_schema() -> Schema {
    Schema {
        version: 1,
        postgres_version: "16".into(),
        generated_at: None,
        source: None,
        tables: vec![Table {
            name: "users".into(),
            schema: "public".into(),
            columns: vec![
                Column {
                    name: "id".into(),
                    pg_type: PgTypeRef::simple("uuid"),
                    oid: 2950,
                    nullable: false,
                    primary_key: true,
                    unique: false,
                    default: None,
                },
                Column {
                    name: "deleted_at".into(),
                    pg_type: PgTypeRef::simple("timestamptz"),
                    oid: 1184,
                    nullable: true,
                    primary_key: false,
                    unique: false,
                    default: None,
                },
            ],
            foreign_keys: vec![],
        }],
        enums: vec![],
        composites: vec![],
    }
}

fn simple_scope() -> Scope {
    Scope {
        tables: vec![TableRef {
            alias: "users".into(),
            table_name: "users".into(),
            schema: None,
            join_kind: JoinKind::Base,
        }],
    }
}

#[test]
fn column_nullable_from_schema() {
    let schema = simple_schema();
    let scope = simple_scope();
    let ctx = ExprContext {
        schema: &schema,
        scope: &scope,
        strict: true,
    };
    let parsed = sqlparser::parser::Parser::parse_sql(
        &sqlparser::dialect::PostgreSqlDialect {},
        "SELECT deleted_at FROM users",
    )
    .unwrap();
    let body = if let sqlparser::ast::Statement::Query(q) = &parsed[0] {
        q
    } else {
        panic!()
    };
    let select = if let sqlparser::ast::SetExpr::Select(s) = &*body.body {
        s
    } else {
        panic!()
    };
    let sel_item = &select.projection[0];
    let expr = match sel_item {
        sqlparser::ast::SelectItem::UnnamedExpr(e) => e,
        _ => panic!(),
    };
    assert!(infer_expr_nullability(expr, &ctx).nullable);
}

#[test]
fn coalesce_non_null_if_any_non_null() {
    // `COALESCE(deleted_at, '1970-01-01')` → non-null
    let schema = simple_schema();
    let scope = simple_scope();
    let ctx = ExprContext {
        schema: &schema,
        scope: &scope,
        strict: true,
    };
    let parsed = sqlparser::parser::Parser::parse_sql(
        &sqlparser::dialect::PostgreSqlDialect {},
        "SELECT COALESCE(deleted_at, '1970-01-01'::timestamptz) FROM users",
    )
    .unwrap();
    let body = if let sqlparser::ast::Statement::Query(q) = &parsed[0] {
        q
    } else {
        panic!()
    };
    let select = if let sqlparser::ast::SetExpr::Select(s) = &*body.body {
        s
    } else {
        panic!()
    };
    let expr = match &select.projection[0] {
        sqlparser::ast::SelectItem::UnnamedExpr(e) => e,
        _ => panic!(),
    };
    assert!(!infer_expr_nullability(expr, &ctx).nullable);
}

#[test]
fn literal_null_is_nullable() {
    let schema = simple_schema();
    let scope = simple_scope();
    let ctx = ExprContext {
        schema: &schema,
        scope: &scope,
        strict: true,
    };
    let parsed = sqlparser::parser::Parser::parse_sql(
        &sqlparser::dialect::PostgreSqlDialect {},
        "SELECT NULL FROM users",
    )
    .unwrap();
    let body = if let sqlparser::ast::Statement::Query(q) = &parsed[0] {
        q
    } else {
        panic!()
    };
    let select = if let sqlparser::ast::SetExpr::Select(s) = &*body.body {
        s
    } else {
        panic!()
    };
    let expr = match &select.projection[0] {
        sqlparser::ast::SelectItem::UnnamedExpr(e) => e,
        _ => panic!(),
    };
    assert!(infer_expr_nullability(expr, &ctx).nullable);
}