uqa-sql 0.5.4

PostgreSQL-compatible SQL compiler built on libpg_query
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

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

//! Whole-row and system Vars retain the declaring relation's identities.

use super::{deparse, expressions, parse, Field, Routines};
use crate::{
    ast::{ColumnDef, CompositeTypeReference},
    schema::{ColumnTypeSchema, ScalarTypeSchema},
    ColumnType, SQLError, Statement,
};

struct Names<'a> {
    relation: &'a str,
    columns: &'a [ColumnDef],
}

impl deparse::ExpressionNames for Names<'_> {
    fn column(&self, attribute: i64) -> Result<String, SQLError> {
        self.columns
            .iter()
            .find(|column| column.attribute_number.map(i64::from) == Some(attribute))
            .map(|column| column.name.clone())
            .ok_or_else(|| SQLError::UnknownColumn(attribute.to_string()))
    }

    fn relation_name(&self) -> Result<String, SQLError> {
        Ok(self.relation.into())
    }

    fn routine(&self, oid: i64) -> Result<Vec<String>, SQLError> {
        deparse::ExpressionNames::routine(&Routines, oid)
    }

    fn type_name(&self, oid: i64, modifier: i64) -> Result<String, SQLError> {
        if modifier == -1 {
            if let Some(ty) = u32::try_from(oid)
                .ok()
                .and_then(crate::catalog::type_metadata::builtin_scalar_type)
            {
                return Ok(ty.sql_name());
            }
        }
        deparse::ExpressionNames::type_name(&Routines, oid, modifier)
    }
}

#[test]
fn relation_scope_nodes_and_sql_match_postgresql() {
    let fixture: serde_json::Value =
        serde_json::from_str(include_str!("relation_scope.json")).unwrap();
    for case in fixture["cases"].as_array().unwrap() {
        let name = case["relation"].as_str().unwrap();
        let row_type = ColumnType::Composite(CompositeTypeReference {
            schema: "row_nodes".into(),
            name: name.into(),
            oid: u32::try_from(case["type_oid"].as_u64().unwrap()).unwrap(),
            array_oid: u32::try_from(case["array_oid"].as_u64().unwrap()).unwrap(),
            relation_oid: u32::try_from(case["relation_oid"].as_u64().unwrap()).unwrap(),
        });
        let columns = case["columns"]
            .as_array()
            .unwrap()
            .iter()
            .map(|column| {
                let mut definition = ColumnDef::nullable(
                    column["name"].as_str().unwrap(),
                    ColumnType::from_sql_name(column["type"].as_str().unwrap()).unwrap(),
                );
                definition.attribute_number =
                    Some(i16::try_from(column["attribute"].as_i64().unwrap()).unwrap());
                definition
            })
            .collect::<Vec<_>>();
        let qualified = format!("row_nodes.{name}");
        let schema = ColumnTypeSchema::with_relation(&columns, &qualified, &row_type).unwrap();
        let physical = crate::RowSchema::with_column_definitions(Some(name), &columns)
            .with_relation_row_type(name, row_type.clone())
            .unwrap();
        assert!(std::ptr::eq(
            schema.whole_row_type(name).unwrap(),
            &raw const row_type
        ));
        assert_eq!(schema.type_of("tableoid"), Some(&ColumnType::Oid));
        assert_eq!(schema.collation_of("tableoid"), Some(0));
        let sql = format!("SELECT {}", case["expression"].as_str().unwrap());
        let Statement::Select(query) = crate::compile(&sql).unwrap().remove(0) else {
            panic!("SELECT expression");
        };
        let context = expressions::ExpressionContext {
            schema: &schema,
            domain_value: None,
            types: None,
            routines: &Routines,
        };
        let node = context.check(&query.projections[0].expr).unwrap();
        let expected = parse(case["node"].as_str().unwrap()).unwrap();
        assert_eq!(Field::Node(node.clone()), expected, "{name}: {sql}");
        let names = Names {
            relation: name,
            columns: &columns,
        };
        for pretty in [false, true] {
            assert_eq!(
                deparse::expression(&node.clone().into(), &names, pretty).unwrap(),
                case[if pretty { "pretty" } else { "sql" }]
                    .as_str()
                    .unwrap(),
                "{name}: {sql}, pretty={pretty}"
            );
        }
        if name != "shadow" {
            for scalar in [
                crate::ScalarExpr::Column(name.into()),
                crate::ScalarExpr::QualifiedStar(name.into()),
            ] {
                assert_eq!(
                    crate::scalar_type(&scalar, &schema, &[]).unwrap(),
                    Some(row_type.clone())
                );
                assert_eq!(
                    crate::scalar_type(&scalar, &physical, &[]).unwrap(),
                    Some(row_type.clone())
                );
            }
        }
    }
}