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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::write_comma_separated_list;
use crate::ast::Identifier;
#[derive(Debug, Clone, PartialEq, Eq, Drive, DriveMut)]
pub struct UnSetStmt {
pub session_level: bool,
pub source: UnSetSource,
}
impl Display for UnSetStmt {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
write!(f, "UNSET ")?;
if self.session_level {
write!(f, "SESSION ")?;
}
write!(f, "{}", self.source)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Drive, DriveMut)]
pub enum UnSetSource {
Var { variable: Identifier },
Vars { variables: Vec<Identifier> },
}
impl Display for UnSetSource {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
match self {
UnSetSource::Var { variable } => write!(f, "{variable}"),
UnSetSource::Vars { variables } => {
write!(f, "(")?;
write_comma_separated_list(f, variables)?;
write!(f, ")")
}
}
}
}