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// 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::Identifier;
use crate::ast::ShowLimit;
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct ShowColumnsStmt {
pub catalog: Option<Identifier>,
pub database: Option<Identifier>,
pub table: Identifier,
pub full: bool,
pub limit: Option<ShowLimit>,
}
impl Display for ShowColumnsStmt {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
write!(f, "SHOW")?;
if self.full {
write!(f, " FULL")?;
}
write!(f, " COLUMNS FROM {}", self.table)?;
if let Some(database) = &self.database {
write!(f, " FROM ")?;
if let Some(catalog) = &self.catalog {
write!(f, "{catalog}.",)?;
}
write!(f, "{database}")?;
}
if let Some(limit) = &self.limit {
write!(f, " {limit}")?;
}
Ok(())
}
}