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feat(optimizer): support split now or rule (#14127)
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102 changes: 102 additions & 0 deletions
102
src/frontend/src/optimizer/rule/stream/split_now_or_rule.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| // Copyright 2023 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. | ||
|
|
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| use risingwave_common::types::DataType; | ||
|
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| use crate::expr::{ExprImpl, ExprType, FunctionCall}; | ||
| use crate::optimizer::plan_node::{LogicalFilter, LogicalShare, LogicalUnion, PlanTreeNodeUnary}; | ||
| use crate::optimizer::rule::{BoxedRule, Rule}; | ||
| use crate::optimizer::PlanRef; | ||
|
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| /// Convert `LogicalFilter` with now or others predicates to a `UNION ALL` | ||
| /// | ||
| /// Before: | ||
| /// ```text | ||
| /// `LogicalFilter` | ||
| /// now() or others | ||
| /// | | ||
| /// Input | ||
| /// ``` | ||
| /// | ||
| /// After: | ||
| /// ```text | ||
| /// `LogicalUnionAll` | ||
| /// / \ | ||
| /// `LogicalFilter` `LogicalFilter` | ||
| /// now() & !others others | ||
| /// | | | ||
| /// \ / | ||
| /// `LogicalShare` | ||
| /// | | ||
| /// Input | ||
| /// ```text | ||
| pub struct SplitNowOrRule {} | ||
| impl Rule for SplitNowOrRule { | ||
| fn apply(&self, plan: PlanRef) -> Option<PlanRef> { | ||
| let filter: &LogicalFilter = plan.as_logical_filter()?; | ||
| let input = filter.input(); | ||
|
|
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| if filter.predicate().conjunctions.len() != 1 { | ||
| return None; | ||
| } | ||
|
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| let disjunctions = filter.predicate().conjunctions[0].as_or_disjunctions()?; | ||
|
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| if disjunctions.len() < 2 { | ||
| return None; | ||
| } | ||
|
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| let (mut now, others): (Vec<ExprImpl>, Vec<ExprImpl>) = | ||
| disjunctions.into_iter().partition(|x| x.count_nows() != 0); | ||
|
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| // Only support now in one arm of disjunctions | ||
| if now.len() != 1 { | ||
| return None; | ||
| } | ||
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| // A or B or C ... or Z | ||
| // => | ||
| // + A & !B & !C ... &!Z | ||
| // + B | C ... | Z | ||
|
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| let mut arm1 = now.pop().unwrap(); | ||
| for pred in &others { | ||
| let not_pred: ExprImpl = | ||
| FunctionCall::new_unchecked(ExprType::Not, vec![pred.clone()], DataType::Boolean) | ||
| .into(); | ||
| arm1 = | ||
| FunctionCall::new_unchecked(ExprType::And, vec![arm1, not_pred], DataType::Boolean) | ||
| .into(); | ||
| } | ||
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| let arm2 = others | ||
| .into_iter() | ||
| .reduce(|a, b| { | ||
| FunctionCall::new_unchecked(ExprType::Or, vec![a, b], DataType::Boolean).into() | ||
| }) | ||
| .unwrap(); | ||
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| let share = LogicalShare::create(input); | ||
| let filter1 = LogicalFilter::create_with_expr(share.clone(), arm1); | ||
| let filter2 = LogicalFilter::create_with_expr(share.clone(), arm2); | ||
| let union_all = LogicalUnion::create(true, vec![filter1, filter2]); | ||
| Some(union_all) | ||
| } | ||
| } | ||
|
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| impl SplitNowOrRule { | ||
| pub fn create() -> BoxedRule { | ||
| Box::new(SplitNowOrRule {}) | ||
| } | ||
| } |