mz_expr/scalar/func/impls/
uint32.rs

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
149
150
151
152
153
// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

use std::fmt;

use mz_lowertest::MzReflect;
use mz_repr::adt::numeric::{self, Numeric, NumericMaxScale};
use mz_repr::{strconv, ColumnType, ScalarType};
use serde::{Deserialize, Serialize};

use crate::scalar::func::EagerUnaryFunc;
use crate::EvalError;

sqlfunc!(
    #[sqlname = "~"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::BitNotUint32)]
    fn bit_not_uint32(a: u32) -> u32 {
        !a
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_real"]
    #[preserves_uniqueness = false]
    #[inverse = to_unary!(super::CastFloat32ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_float32(a: u32) -> f32 {
        // TODO(benesch): remove potentially dangerous usage of `as`.
        #[allow(clippy::as_conversions)]
        {
            a as f32
        }
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_double"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastFloat64ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_float64(a: u32) -> f64 {
        f64::from(a)
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_uint2"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastUint16ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_uint16(a: u32) -> Result<u16, EvalError> {
        u16::try_from(a).or(Err(EvalError::UInt16OutOfRange(a.to_string().into())))
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_uint8"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastUint64ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_uint64(a: u32) -> u64 {
        u64::from(a)
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_smallint"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastInt16ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_int16(a: u32) -> Result<i16, EvalError> {
        i16::try_from(a).or(Err(EvalError::Int16OutOfRange(a.to_string().into())))
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_integer"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastInt32ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_int32(a: u32) -> Result<i32, EvalError> {
        i32::try_from(a).or(Err(EvalError::Int32OutOfRange(a.to_string().into())))
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_bigint"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastInt64ToUint32)]
    #[is_monotone = true]
    fn cast_uint32_to_int64(a: u32) -> i64 {
        i64::from(a)
    }
);

sqlfunc!(
    #[sqlname = "uint4_to_text"]
    #[preserves_uniqueness = true]
    #[inverse = to_unary!(super::CastStringToUint32)]
    fn cast_uint32_to_string(a: u32) -> String {
        let mut buf = String::new();
        strconv::format_uint32(&mut buf, a);
        buf
    }
);

#[derive(Ord, PartialOrd, Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash, MzReflect)]
pub struct CastUint32ToNumeric(pub Option<NumericMaxScale>);

impl<'a> EagerUnaryFunc<'a> for CastUint32ToNumeric {
    type Input = u32;
    type Output = Result<Numeric, EvalError>;

    fn call(&self, a: u32) -> Result<Numeric, EvalError> {
        let mut a = Numeric::from(a);
        if let Some(scale) = self.0 {
            if numeric::rescale(&mut a, scale.into_u8()).is_err() {
                return Err(EvalError::NumericFieldOverflow);
            }
        }
        // Besides `rescale`, cast is infallible.
        Ok(a)
    }

    fn output_type(&self, input: ColumnType) -> ColumnType {
        ScalarType::Numeric { max_scale: self.0 }.nullable(input.nullable)
    }

    fn could_error(&self) -> bool {
        self.0.is_some()
    }

    fn inverse(&self) -> Option<crate::UnaryFunc> {
        to_unary!(super::CastNumericToUint32)
    }

    fn is_monotone(&self) -> bool {
        true
    }
}

impl fmt::Display for CastUint32ToNumeric {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("uint4_to_numeric")
    }
}