risingwave_frontend/optimizer/plan_node/
stream_union.rs

// 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 std::ops::BitAnd;

use fixedbitset::FixedBitSet;
use pretty_xmlish::XmlNode;
use risingwave_pb::stream_plan::stream_node::PbNodeBody;
use risingwave_pb::stream_plan::UnionNode;

use super::stream::prelude::*;
use super::utils::{childless_record, watermark_pretty, Distill};
use super::{generic, ExprRewritable, PlanRef};
use crate::optimizer::plan_node::expr_visitable::ExprVisitable;
use crate::optimizer::plan_node::generic::GenericPlanNode;
use crate::optimizer::plan_node::{PlanBase, PlanTreeNode, StreamNode};
use crate::optimizer::property::{Distribution, MonotonicityMap};
use crate::stream_fragmenter::BuildFragmentGraphState;

/// `StreamUnion` implements [`super::LogicalUnion`]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct StreamUnion {
    pub base: PlanBase<Stream>,
    core: generic::Union<PlanRef>,
}

impl StreamUnion {
    pub fn new(core: generic::Union<PlanRef>) -> Self {
        let inputs = &core.inputs;
        let dist = inputs[0].distribution().clone();
        assert!(inputs.iter().all(|input| *input.distribution() == dist));
        Self::new_with_dist(core, dist)
    }

    pub fn new_with_dist(core: generic::Union<PlanRef>, dist: Distribution) -> Self {
        let inputs = &core.inputs;

        let watermark_columns = inputs.iter().fold(
            {
                let mut bitset = FixedBitSet::with_capacity(core.schema().len());
                bitset.toggle_range(..);
                bitset
            },
            |acc_watermark_columns, input| acc_watermark_columns.bitand(input.watermark_columns()),
        );

        let base = PlanBase::new_stream_with_core(
            &core,
            dist,
            inputs.iter().all(|x| x.append_only()),
            inputs.iter().all(|x| x.emit_on_window_close()),
            watermark_columns,
            MonotonicityMap::new(),
        );

        StreamUnion { base, core }
    }
}

impl Distill for StreamUnion {
    fn distill<'a>(&self) -> XmlNode<'a> {
        let mut vec = self.core.fields_pretty();
        if let Some(ow) = watermark_pretty(self.base.watermark_columns(), self.schema()) {
            vec.push(("output_watermarks", ow));
        }
        childless_record("StreamUnion", vec)
    }
}

impl PlanTreeNode for StreamUnion {
    fn inputs(&self) -> smallvec::SmallVec<[crate::optimizer::PlanRef; 2]> {
        smallvec::SmallVec::from_vec(self.core.inputs.clone())
    }

    fn clone_with_inputs(&self, inputs: &[crate::optimizer::PlanRef]) -> PlanRef {
        let mut new = self.core.clone();
        new.inputs = inputs.to_vec();
        let dist = self.distribution().clone();
        Self::new_with_dist(new, dist).into()
    }
}

impl StreamNode for StreamUnion {
    fn to_stream_prost_body(&self, _state: &mut BuildFragmentGraphState) -> PbNodeBody {
        PbNodeBody::Union(UnionNode {})
    }
}

impl ExprRewritable for StreamUnion {}

impl ExprVisitable for StreamUnion {}
risingwave_frontend/optimizer/plan_node/stream_union.rs

risingwave_frontend/optimizer/plan_node/
stream_union.rs
