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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::Expr;
use crate::ast::Identifier;
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct Hint {
pub hints_list: Vec<HintItem>,
}
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct HintItem {
pub name: Identifier,
pub expr: Expr,
}
impl Display for Hint {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
write!(f, "/*+ ")?;
for hint in &self.hints_list {
write!(f, "SET_VAR(")?;
write!(f, "{}", hint.name)?;
write!(f, "=")?;
write!(f, "{}", hint.expr)?;
write!(f, ") ")?;
}
write!(f, "*/")
}
}