databend_common_ast/ast/statements/
columns.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::Identifier;
22use crate::ast::ShowLimit;
23
24#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
25pub struct ShowColumnsStmt {
26    pub catalog: Option<Identifier>,
27    pub database: Option<Identifier>,
28    pub table: Identifier,
29    pub full: bool,
30    pub limit: Option<ShowLimit>,
31}
32
33impl Display for ShowColumnsStmt {
34    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
35        write!(f, "SHOW")?;
36        if self.full {
37            write!(f, " FULL")?;
38        }
39        write!(f, " COLUMNS FROM {}", self.table)?;
40
41        if let Some(database) = &self.database {
42            write!(f, " FROM ")?;
43            if let Some(catalog) = &self.catalog {
44                write!(f, "{catalog}.",)?;
45            }
46            write!(f, "{database}")?;
47        }
48
49        if let Some(limit) = &self.limit {
50            write!(f, " {limit}")?;
51        }
52
53        Ok(())
54    }
55}
databend_common_ast/ast/statements/columns.rs

databend_common_ast/ast/statements/
columns.rs
