databend_common_ast/ast/statements/
show.rs

1// Copyright 2021 Datafuse Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use std::fmt::Display;
16use std::fmt::Formatter;
17
18use derive_visitor::Drive;
19use derive_visitor::DriveMut;
20
21use crate::ast::Expr;
22
23#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
24pub enum ShowLimit {
25    Like { pattern: String },
26    Where { selection: Box<Expr> },
27}
28
29impl Display for ShowLimit {
30    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
31        match self {
32            ShowLimit::Like { pattern } => write!(f, "LIKE '{pattern}'"),
33            ShowLimit::Where { selection } => write!(f, "WHERE {selection}"),
34        }
35    }
36}
37
38#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
39pub struct ShowOptions {
40    pub show_limit: Option<ShowLimit>,
41    pub limit: Option<u64>,
42}
43
44impl Display for ShowOptions {
45    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
46        if let Some(limit_option) = self.show_limit.clone() {
47            write!(f, "{}", limit_option)?;
48        }
49        if let Some(limit) = self.limit {
50            write!(f, " LIMIT {limit}")?;
51        }
52        Ok(())
53    }
54}
databend_common_ast/ast/statements/show.rs

databend_common_ast/ast/statements/
show.rs
