risingwave_frontend/utils/
rewrite_index.rs

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// Copyright 2024 RisingWave 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 super::ColIndexMapping;
use crate::expr::{ExprImpl, ExprRewriter, InputRef};

pub struct IndexRewriter {
    mapping: ColIndexMapping,
}

impl IndexRewriter {
    pub fn new(mapping: ColIndexMapping) -> Self {
        Self { mapping }
    }
}

impl ExprRewriter for IndexRewriter {
    fn rewrite_input_ref(&mut self, mut input_ref: InputRef) -> ExprImpl {
        input_ref.index = self.mapping.map(input_ref.index);

        ExprImpl::InputRef(Box::new(input_ref))
    }
}