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
// Copyright 2021 Datafuse Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::fmt::Display;
use std::fmt::Formatter;
use derive_visitor::Drive;
use derive_visitor::DriveMut;
use crate::ast::Expr;
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub enum ShowLimit {
Like { pattern: String },
Where { selection: Box<Expr> },
}
impl Display for ShowLimit {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
match self {
ShowLimit::Like { pattern } => write!(f, "LIKE '{pattern}'"),
ShowLimit::Where { selection } => write!(f, "WHERE {selection}"),
}
}
}
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct ShowOptions {
pub show_limit: Option<ShowLimit>,
pub limit: Option<u64>,
}
impl Display for ShowOptions {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
if let Some(limit_option) = self.show_limit.clone() {
write!(f, "{}", limit_option)?;
}
if let Some(limit) = self.limit {
write!(f, " LIMIT {limit}")?;
}
Ok(())
}
}